Electricity Saving Tips For Homes And Offices

What is Inverter Technology AC and How it is Different from BEE 5 star Non Inverter AC?

By on August 7, 2017

Air Conditioners are a pain point for most people in our country who are concerned about their electricity bills. The moment an air conditioner is added to the list of appliances used in a household, the electricity bills increase significantly. Although it is difficult to significantly reduce the “big” impact of an air conditioner on your electricity bills, but still some of it can be managed by choosing the right technology, doing the right installation/maintenance/operation and by doing the right insulation of the room where the air conditioner is used (more details in our articles listed at the end of this article).


When it comes to technology, there were not many available till sometime back. When BEE actively started analyzing and labeling the air conditioners, we got some good one in form of 5 star air conditioners. The latest and the most efficient technology that is available in market today is the Inverter Technology for air conditioners. Inverter technology is designed in such a way that it can save 30-50% of electricity (units consumed) over a regular air conditioner. And since 2016, BEE has started give star ratings to inverter technology ACs as well. However, let’s look at what is inverter technology and how is it different from a non inverter BEE 5 star rated ACs. But before that if you reached this page looking for best inverter ACs in India, then here is the list:

Best Inverter ACs in India

  • Godrej GSC 12 FIXH 7 GGPG (1.00 ton, BEE 5 star inverter split air conditioner)
  • Bluestar 3CNHW12TAFU (1.00 ton, BEE 3 star inverter split air conditioner)
  • Daikin JTKM50 (1.50 ton, BEE 5 star inverter split air conditioner)
  • Hitachi RSH318EAEA (1.50 ton, BEE 3 star inverter split air conditioner)
  • Mitsubishi electric MSY-GK24VA (2.00 ton, BEE 5 star inverter split air conditioner)
  • Hitachi RMB324IAEA (2.00 ton, BEE 3 star inverter split air conditioner)
  • Bluestar 5CNHW09PAFU (0.75 ton, BEE 5 star inverter split air conditioner)
  • Bluestar 3CNHW09CAFU (0.75 ton, BEE 3 star inverter split air conditioner)

You can get a more detailed list and options at the end of this article.

How does an air conditioner work?

For most people, air conditioner just throws cool air at the temperature one sets it at. But does it really work that way? In fact air conditioner during cooling process, takes the indoor air, cools it by passing it through evaporator and throws it back in the room. It is quite opposite to how our good old air coolers used to work. Air coolers used to take outside air, cool it with water and throw it in. But air conditioners just work on internal air. Along with evaporator air conditioner also has a compressor that compresses the gas (refrigerant) in the AC to cool it that in turn cools the incoming internal air from the room.

In a regular air conditioner:

The compressor is either off or on. When it is on, it works at full capacity and consumes full electricity it is designed to consume. When the thermostat reaches the temperature level set in the AC, the compressor stops and the fan (in AC) continues to operate. When the thermostat senses that the temperature has increased, the compressor starts again.

What is Inverter Air Conditioner?

The inverter technology works like an accelerator in a car. When compressor needs more power, it gives it more power. When it needs less power, it gives less power. With this technology, the compressor is always on, but draws less power or more power depending on the temperature of the incoming air and the level set in the thermostat. The speed and power of the compressor is adjusted appropriately. This technology was developed in Japan and is being used there successfully for air conditioners and refrigerators. This technology is currently available only in split air conditioners.

What is benefit of Inverter Technology?

Every air conditioner is designed for a maximum peak load. So a 1.5ton AC is designed for a certain size of room and 1 ton for a different size. But not all rooms are of same size. A regular air conditioner of 1.5ton capacity will always run at peak power requirement when the compressor is running. An air conditioner with inverter technology will run continuously but will draw only that much power that is required to keep the temperature stable at the level desired. So it kind of automatically adjusts its capacity based on the requirement of the room it is cooling. Thus drawing much less power and consuming lesser units of electricity.

Although air conditioner with Inverter Technology adjusts its capacity based on the room requirement, it is very important to install a right sized air conditioner in a room. Please make sure that you evaluate the room and air conditioner capacity before you make a purchase.

What’s the difference between Inverter Technology AC and BEE 5 star non inverter AC

  1. Inverter technology air conditioners are variable speed/ variable tonnage air conditioners and thus operationally they are quite different from regular air conditioners that have single speed compressors and single tonnage.
  2. Inverter technology air conditioners adjust their speed/tonnage depending on heat load of a room. Whereas regular air conditioners do not.
  3. Every room has a different heat load, even if they are of the same size. The heat load depends on various factors as we have listed on our article: Things that impact electricity consumption in air conditioners. To give you an analogy, every human being is different; even then the waist sizes of most trousers available in the market are fixed (leaving the ones with elastic). Inverter Technology AC is just like a trouser with an elastic waist that can adjust to the size. The other benefit is that even if the waist size increases or decreases, the trouser with elastic will adjust accordingly. Regular Air Conditioners are fixed size.
  4. Based on the data on power consumption by BEE, Inverter ACs of BEE 3 star ratings are about 7% more energy efficient than BEE 5 star rated non inverter ACs.
  5. The heat load in a room does not remain constant and it varies from seasons, varies based on number of people, varies between day and night, varies based on climate profiles of your location. To take the same analogy we mentioned above, the waist size increases or decreases with the amount of food one eats or the amount of exercise one does. So as a trouser with elastic waist can work well, an air conditioner with inverter tech can work well.

Power Consumption of Inverter and non inverter air conditioners.

Based on data from BEE in 2017, below is the representative (median) sample of power consumption of Air Conditioners of various tonnage and star ratings:

0.75 ton1 ton1.5 ton2 ton
3 Star Non Inverter62782812351548
5 Star Non Inverter57676011301412
3 Star Inverter55072610771344
4 Star Inverter4996589721208
5 Star Inverter4215578151005
Annual Electricity Consumption (Units or kWh for 1600 hrs) based on data from BEE

Are Inverter technology air conditioners slow in cooling?

Several people have concerns that Inverter Technology air conditioners do not cool well or cool slowly. However let us take this image as reference to understand how inverter AC works:

Inverter AC

Non inverter ACs are fixed speed ACs, where as inverter ACs are variable speed ACs. Non inverter ACs have compressors that go “On” and “Off”. Whereas inverter ACs have compressors that are “On” all the time. As non inverter ACs are sized for peak summer heat load, they are over-sized all the other times (in fact most of the time people oversize even for peak summer season). The drawback of the same is that the AC “Over cools” most of the time. So if you set AC at temperature of 25, it will cool it down to 23 or 22. Now one would question: then what is the use of thermostat? Well the thermostat (in a non inverter AC) switches off the compressor when the outside temperature has reached 25. But a lot has happened before that. In an AC, refrigerant moves from liquid to gas (by taking heat from the room) and then back from gas to liquid as the compressor compresses it. But if the refrigerant is more and heat in the room is less (which happens in over sized AC), it does not get enough heat from the room to convert from liquid to gas and it keeps moving as liquid. Now when the thermostat detects temperature and switches off the compressor, the refrigerant still remains in liquid state and thus has capacity to take heat from room to convert to gas. And so it takes more heat from the room and cools the room below the set temperature.

In comparison, the inverter tech AC changes the flow rate of refrigerant based on the heat of the room. When heat is less, the flow rate is less, when heat is more, the flow rate is more. And it does not switch off the compressor ever. It just makes sure that if temperature setting is 25, it is maintained at that level.

So the difference is: non inverter AC would over cool as shown in the picture. Whereas inverter AC will cool optimum. And thus one may feel that inverter AC does not cool or is slow.

Is there a Window AC with inverter technology available in market?

No there is no window Air Conditioner with inverter tech available in market. Will they be available in future? We don’t know.

Are there Star Ratings for Inverter ACs?

In 2016, BEE introduced a new star rating standard for Inverter Technology ACs as well. Currently most models are in BEE 3, 4 and 5 Star rating ranges on BEE. In future (in 2018), BEE plans to merge the star rating standards of inverter and non inverter ACs. To know more about new star rating standards for Inverter ACs, you may read this page on our website: Understand What is ISEER and Star Labeling of Inverter Air Conditioners in India.

If you are looking for most energy efficient inverter ACs, here is the list:

Best BEE 5 & 4 Star Rated Inverter Air Conditioners

 

Click on a category button below to choose category.

  • Best 1.5 Ton BEE 5 Star Inverter AC (Click To Expand/Minimize)
    • Rank 1
    • DAIKIN-JTKM50
      • 1.40 Ton
      • 5.20 ISEER
      • 744 Annual Units (for 1600 hrs)
    • Rank 2
    • HITACHI-RSA518CAEA
      • 1.50 Ton
      • 5.15 ISEER
      • 793 Annual Units (for 1600 hrs)
    • Rank 3
    • GODREJ-GSC 18 GIG 5 DGOG
      • 1.40 Ton
      • 4.90 ISEER
      • 791 Annual Units (for 1600 hrs)
    • Rank 4
    • HITACHI-RSB518IAEA
      • 1.50 Ton
      • 4.85 ISEER
      • 842 Annual Units (for 1600 hrs)
    • Rank 5
    • BLUESTAR-5CNHW18PAFU
      • 1.50 Ton
      • 4.75 ISEER
      • 839 Annual Units (for 1600 hrs)
    • Rank 6
    • BLUESTAR-5CNHW18DAFU
      • 1.50 Ton
      • 4.74 ISEER
      • 850 Annual Units (for 1600 hrs)
    • Rank 7
    • LG-BS-18APZE
      • 1.50 Ton
      • 4.73 ISEER
      • 865 Annual Units (for 1600 hrs)
    • Rank 8
    • TOSHIBA-RAS-18N3KCV-IN + RAS-18N3ACV-IN
      • 1.40 Ton
      • 4.69 ISEER
      • 818 Annual Units (for 1600 hrs)
    • Rank 9
    • BLUESTAR-5CNHW18QATX
      • 1.50 Ton
      • 4.68 ISEER
      • 884 Annual Units (for 1600 hrs)
    • Rank 10
    • MITSUBISHI ELECTRIC-MSY-GK18VA
      • 1.50 Ton
      • 4.66 ISEER
      • 847 Annual Units (for 1600 hrs)
  • Best 1.0 Ton BEE 5 Star Inverter AC (Click To Expand/Minimize)
    • Rank 1
    • DAIKIN-JTKM35
      • 1.00 Ton
      • 5.80 ISEER
      • 483 Annual Units (for 1600 hrs)
    • Rank 2
    • GODREJ-GSC 12 FIXH 7 GGPG
      • 1.00 Ton
      • 5.80 ISEER
      • 474 Annual Units (for 1600 hrs)
    • Rank 3
    • HITACHI-RAU512CWEA
      • 1.00 Ton
      • 5.75 ISEER
      • 492 Annual Units (for 1600 hrs)
    • Rank 4
    • GODREJ-GSC 12 GIG 5 DGOG
      • 1.00 Ton
      • 5.20 ISEER
      • 512 Annual Units (for 1600 hrs)
    • Rank 5
    • BLUESTAR-5HNHW12PAFU
      • 1.00 Ton
      • 4.86 ISEER
      • 557 Annual Units (for 1600 hrs)
    • Rank 6
    • HITACHI-RAU512AWEA
      • 1.00 Ton
      • 4.86 ISEER
      • 560 Annual Units (for 1600 hrs)
    • Rank 7
    • LG-BSA12PMZD
      • 1.00 Ton
      • 4.74 ISEER
      • 584 Annual Units (for 1600 hrs)
    • Rank 8
    • LG-BS-12APZE
      • 1.00 Ton
      • 4.73 ISEER
      • 581 Annual Units (for 1600 hrs)
    • Rank 9
    • BLUESTAR-5CNHW12PAFU
      • 1.00 Ton
      • 4.71 ISEER
      • 565 Annual Units (for 1600 hrs)
    • Rank 10
    • TOSHIBA-RAS-13N3KCV-IN + RAS-13N3ACV-IN
      • 1.00 Ton
      • 4.66 ISEER
      • 592 Annual Units (for 1600 hrs)
  • Best 2.0 Ton BEE 5 Star Inverter AC (Click To Expand/Minimize)
    • Rank 1
    • MITSUBISHI ELECTRIC-MSY-GK24VA
      • 1.90 Ton
      • 4.85 ISEER
      • 1052 Annual Units (for 1600 hrs)
    • Rank 2
    • HITACHI-RMC424EAEA
      • 2.00 Ton
      • 4.21 ISEER
      • 1288 Annual Units (for 1600 hrs)
  • Best 0.75 Ton BEE 5 Star Inverter AC (Click To Expand/Minimize)
    • Rank 1
    • BLUESTAR-5CNHW09PAFU
      • 0.80 Ton
      • 4.71 ISEER
      • 453 Annual Units (for 1600 hrs)
    • Rank 2
    • BLUESTAR-5HNHW09PAFU
      • 0.80 Ton
      • 4.64 ISEER
      • 447 Annual Units (for 1600 hrs)
    • Rank 3
    • DAIKIN-FTKP25
      • 0.70 Ton
      • 4.17 ISEER
      • 464 Annual Units (for 1600 hrs)

To know more about BEE Star Rating of Inverter Air Conditioners check this page on our website: Understand What is ISEER and Star Labeling of Inverter Air Conditioners in India

Best BEE 3 Star Rated Inverter Air Conditioners

Click on a category button below to choose category.

  • Best 1.5 Ton BEE 3 Star Inverter AC (Click To Expand/Minimize)
    • Rank 1
    • HITACHI-RSB318IAEA
      • 1.50 Ton
      • 3.99 ISEER
      • 1023 Annual Units (for 1600 hrs)
    • Rank 2
    • HITACHI-RSD318EAEA
      • 1.50 Ton
      • 3.99 ISEER
      • 1023 Annual Units (for 1600 hrs)
    • Rank 3
    • HITACHI-RSH318EAEA
      • 1.50 Ton
      • 3.99 ISEER
      • 1023 Annual Units (for 1600 hrs)
    • Rank 4
    • LLOYD-LS18AI
      • 1.50 Ton
      • 3.95 ISEER
      • 1000 Annual Units (for 1600 hrs)
    • Rank 5
    • RECONNECT-RHSAB1507
      • 1.50 Ton
      • 3.95 ISEER
      • 1059 Annual Units (for 1600 hrs)
    • Rank 6
    • PANASONIC-PS18SKY
      • 1.50 Ton
      • 3.92 ISEER
      • 1008 Annual Units (for 1600 hrs)
    • Rank 7
    • LG-JS-Q18APXD
      • 1.50 Ton
      • 3.86 ISEER
      • 1041 Annual Units (for 1600 hrs)
    • Rank 8
    • LG-JS-Q18CPXD
      • 1.50 Ton
      • 3.86 ISEER
      • 1041 Annual Units (for 1600 hrs)
    • Rank 9
    • LG-JS-Q18VPXD
      • 1.50 Ton
      • 3.86 ISEER
      • 1041 Annual Units (for 1600 hrs)
    • Rank 10
    • LLOYD-LS19I3PI
      • 1.60 Ton
      • 3.84 ISEER
      • 1100 Annual Units (for 1600 hrs)
  • Best 1.0 Ton BEE 3 Star Inverter AC (Click To Expand/Minimize)
    • Rank 1
    • BLUESTAR-3CNHW12TAFU
      • 1.00 Ton
      • 3.99 ISEER
      • 669 Annual Units (for 1600 hrs)
    • Rank 2
    • HITACHI-RSG312EAEA
      • 1.00 Ton
      • 3.94 ISEER
      • 692 Annual Units (for 1600 hrs)
    • Rank 3
    • GODREJ-GSC 12 MINV 3 RWPM
      • 1.00 Ton
      • 3.90 ISEER
      • 663 Annual Units (for 1600 hrs)
    • Rank 4
    • BLUESTAR-3CNHW12CAFU
      • 1.00 Ton
      • 3.86 ISEER
      • 680 Annual Units (for 1600 hrs)
    • Rank 5
    • LG-JS-Q12CPXD
      • 1.00 Ton
      • 3.86 ISEER
      • 691 Annual Units (for 1600 hrs)
    • Rank 6
    • LG-JS-Q12NPXA
      • 1.00 Ton
      • 3.86 ISEER
      • 691 Annual Units (for 1600 hrs)
    • Rank 7
    • LG-JS-Q12PWXA
      • 1.00 Ton
      • 3.86 ISEER
      • 691 Annual Units (for 1600 hrs)
    • Rank 8
    • LG-JS-Q12VPXD
      • 1.00 Ton
      • 3.86 ISEER
      • 691 Annual Units (for 1600 hrs)
    • Rank 9
    • BLUESTAR-3HNHW12CBFU
      • 1.00 Ton
      • 3.80 ISEER
      • 688 Annual Units (for 1600 hrs)
    • Rank 10
    • LG-JS-Q12NUXA
      • 1.00 Ton
      • 3.72 ISEER
      • 729 Annual Units (for 1600 hrs)
  • Best 2.0 Ton BEE 3 Star Inverter AC (Click To Expand/Minimize)
    • Rank 1
    • HITACHI-RMB324IAEA
      • 2.00 Ton
      • 3.99 ISEER
      • 1359 Annual Units (for 1600 hrs)
    • Rank 2
    • BLUESTAR-3CNHW24TAFU
      • 1.90 Ton
      • 3.98 ISEER
      • 1275 Annual Units (for 1600 hrs)
    • Rank 3
    • HITACHI-RAU324EWEA
      • 2.00 Ton
      • 3.96 ISEER
      • 1367 Annual Units (for 1600 hrs)
  • Best 0.75 Ton BEE 3 Star Inverter AC (Click To Expand/Minimize)
    • Rank 1
    • BLUESTAR-3CNHW09CAFU
      • 0.80 Ton
      • 3.94 ISEER
      • 536 Annual Units (for 1600 hrs)
    • Rank 2
    • BLUESTAR-3HNHW09CBFU
      • 0.80 Ton
      • 3.87 ISEER
      • 531 Annual Units (for 1600 hrs)

Lesser known benefits of Inverter Technology

  • Regular motors need 3-4 times more current (more than running current) at startup. So the inverter/generator size needed to run any AC or Refrigerator increases significantly. But Inverter Technology air conditioners and refrigerators have variable speed motors that start up gradually needing much lesser current at startup. Thus the size of inverter/generator required to startup is less. For e.g. A 1.5 ton fixed speed AC that runs at about 10 Amp current may need up to 30 Amp current at startup and thus a 5 kVA inverter/generator. But an inverter technology Air Conditioner needs about 6-7 Amp current and not much more at startup and thus a 1.5 kVA or 2 kVA inverter/generator is good enough to support it.
  • Regular motors have much lower power factor. In commercial and industrial connections there is penalty for low power factor and rebates for higher power factor. An inverter technology motor will have power factor close to unity (or 1) which not only results in lesser electricity consumption but also help get rebates on better power factor.
  • If you are planning to use Solar PV for air conditioner, then it is the best to use inverter technology air conditioner or refrigerator as it not only reduces the size of PV panels because it consumes lesser electricity, it also reduces the size of inverter to be put along with the PV panel.

Short video for tips to buy the best air conditioner in India

 

 

 

Calculator for Sizing Air Conditioners in India

Select your city, dimensions of room, usage hours and sunlight checkboxes to get our recommendations. The inputs are on the left size and our recommendations on the right side. Also please note that these calculations are for a regular room in a house. If the room size is more than 400 sq ft then it would be better to call an engineer to do the evaluation.

Air Conditioner Sizing Calculator for India

(Note: This calculator is for a residential setup. It assumes a regular room with some furniture, basic appliances and 4 people in the room. Please do not use the numbers for a commercial setup.)

Inputs:
Check this if the ceiling of the room gets direct sunlight from top during the day.
Check this if West, South or South West walls of the room get direct sunlight during the day.
Outputs:
Please select a city
Size of Air Conditioner that you need:

Note:

Yearly Units ConsumptionYearly Electricity CostsApprox Cost of Buying
BEE 3 Star Non inverter
BEE 5 Star Non inverter
BEE 3 Star Inverter
BEE 4 Star Inverter
BEE 5 Star Inverter

 

Check this link to see Top Ten Air Conditioners in India for Electricity Savings: http://wp.me/p4hAhQ-4I

 


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2052 comments

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1

Is Panasonic also good brand to buy window AC ? i have one mind of blue star

2
Abhishek Jain (Mod)

Panasonic is a good brand, but in general we do not recommend buying window ACs as they are not very energy efficient (will consume more electricity).

3

I want to buy Lloyd inverter 1.5 ton Ac price is 35,000/- , i want to ask for quality for this or suggest other brand in this price

4
Abhishek Jain (Mod)

Lloyd is a good brand. Quite value for money. It is a brand owned by Havells which is a reputed Indian company making electrical appliances.

5

iam confused whats the best of purchase,5 star ratings or 3 star inverter technology

6
Abhishek Jain (Mod)

Will depend on your annual usage of AC, but in general a 3 star inverter AC is most likely to be a better choice.

7

Hello Abhishek,
Your posts and articles are really helpful.Thank you for all your insights.

I need a small help in choosing the right Ac for me.I have calculate dthat I will be needing a 1 ton ac, but Iam confused to choose between 5 star non-invertor or 3 star invertor.Right now Iam looking at these 2 models:
1. mitsahi 1 ton - https://www.amazon.in/Mitashi-Star-Split-MiSAC105v25-White/dp/B0757Y5G3C/ref=sr_1_2?s=kitchen&ie=UTF8&qid=1507219803&sr=1-2&keywords=ac&refinements=p_n_feature_twelve_browse-bin%3A2753037031
2. Lg 1 ton invertor - https://www.amazon.in/LG-Inverter-Split-JS-Q12CPXD-White/dp/B01N7RK47E/ref=sr_1_4?s=kitchen&ie=UTF8&qid=1507218636&sr=1-4&keywords=ac&refinements=p_n_feature_twelve_browse-bin%3A2753035031%2Cp_n_feature_browse-bin%3A12440894031

The problem is that Lg ac uses alluminium condensor, which has the problem of getting damaged soon and lower heat transfer(efficiency)than copper ones in mitashi.But as per the eer rating and the above chart Lg one seems to save a lot of power whereas there is no such 1600 hours chart for mitashi ac.Could you please help me in selecting the ac among these or around this price range and help me get the most bang for the bucks for the ac?Any help is deeply appreciated.

8
Abhishek Jain (Mod)

Hi Abhilash,

LG 3 star rated inverter AC would be much more electricity saving as compared to the Mitashi model you have selected. You can get a 3 star inverter AC with copper also in LG (check: LG JS-Q12AUXA (Amazon Link: http://amzn.to/2fWSI1X ) ... it is mentioned as aluminium but AU, SU, TU models are copper condenser models) ... but then copper models are expensive. LG is a great value for money brand in general.

Also these days they use ALuminium Alloy instead of just aluminium which is better in corrosion protection. However, corrosion can be a big problem in case you live in a corrosive area (close to sea, water body or nalla). But if your area is not corrosive, then even Aluminium models are excellent. I have personally used an aluminium model for 7-8 years without issues. So unless you live in corrosive area, there is no reason to discard aluminium alloy models. And I think LG model would be more bang for the bucks. If area is corrosive then go for Mitashi model.

9

Hello Abhishek,
Thanks for your answer.
Even I felt so but how do I judge whether my area is corrosive or not?I live at Bhandup,Mumbai.Neat bhandup station itself.Though we have a big swimming pool in our society, does that cause more corrosive environment?

Also, what do think about kenstar and Onida invertor Ac avaiable in amazon with copper condensor.
Also I just confirmed from LG that this model of LG ac has multi flow condensor,so it has a 5 year warratty.BUt still on the edge because of the copper-aluminium issue.

10
Abhishek Jain (Mod)

Hi Abhilash,

I live in Powai and I have used LG AC for 8 years without any issues. I do not think Bhandup would be corrosive. Also there is 5 years warranty on the condenser from LG. I think LG would be a better buy. It will be better than Kenstar and Onida inverter AC.

11

sir i am confused lg dual inverter vs samsung 8 pole vs cheap heir,sansui inverter model which is best for cooling and less power consuption

12

3 star dual lg inverter ac and 3 star samsung inverter and i dont have an idea of ac please suggest me the best ac which is easy available in market and ac brand is dosent matter for me only i want good ac and power saver and
super cool .

13
Abhishek Jain (Mod)

Hi Shubham,

At Bijli Bachao, we suggest this strategy: First find out the right tonnage that you need for you room, because undersized AC may not cool well, and in case of non inverter AC, oversized AC can significantly increase electricity bills. In inverter ACs, slight oversizing is fine. You can use the calculator on this page to get the right tonnage: http://bijlibachao.com/top-ten-appliances/best-air-conditioner-ac-window-split-hitachi-lg-carrier-samsung-electricity-consumption-tonnage-in-india.html

Right tonnage depends on city, room’s location (if it gets direct sunlight on walls/ceiling or not), size of the room and number of people in the room, etc. Usually we assume 4 people in a room to do some calculations. But other parameters are required to be known to calculate the right size. A city like mumbai needs less cooling because temperatures do not go too high. But a city like Delhi needs more cooling because it is too hot in summers. Similarly a room on top floor getting direct sunlight on the roof will need more cooling as compared to a room on lower floors. So I would suggest that you use the calculator on this page to calculate the right tonnage.

After finding the right tonnage, you have to look at your usage of AC in hrs/year. And your budget. Because your usage determines if you need high efficiency AC or not (inverter or non inverter). Secondly we try to suggest the most efficient AC based on a person’s requirement (tonnage requirement) and the budget.

Let me know the right tonnage (as per the calculator) and your budget and I can suggest you some models accordingly. As for your brand choice, I would suggest you to go for 3 star dual inverter LG AC. They are good.

14

sir suggest me 1.5 ton inverter ac any model and any company which is easy available in market and super power saver and super cool

15
Abhishek Jain (Mod)

You can look at any of these:

BrandModelAmazon LinkFlipkart Link
DAIKINJTKM50  
HITACHIRSA518CAEA  
GODREJGSC 18 GIG 5 DGOG http://fkrt.it/Kn~DFTuuuN
HITACHIRSB518IAEA  
BLUESTAR5CNHW18PAFUhttp://amzn.to/2wsquPJ 
BLUESTAR5CNHW18DAFU 
16
Abhishek Jain (Mod)

Hi Shubham,

Which models of LG and Samsung are you looking at? LG has multiple models with dual inverter. Similarly Samsung has multiple models with 8 pole and all have different star rating and different electricity consumption.

17

From this article I fail to understand why inverter AC take lesser electricity though I understand why it is a better technology in many ways. There is a table given from BEE to substantiate the claim but can you describe the technical reasons for this? I would assume the energy needed to cool and maintain a room at an expected temperature will depend on the losses. Same amount of cooling will be needed to maintain on an average the same temperature. Please explain how the energy savings happen with inverter ACs.

18
Abhishek Jain (Mod)

Hi Sumit,

The biggest positive of inverter technology is that it eliminates the on-off cycle. The AC compressor does not operate at peak efficiency when it starts up or shuts down. The peak efficiency is obtained only when it is running at peak load. However, inverter technology does not start stop and thus always works at ideal efficiency depending on the load.

To help you understand easily, let me take an analogy. Imagine that you have a tank full of water (let's say 10 mts high). You have been assigned a job to maintain the water level in the tank (let's say to 8 mts). You have two different kind of taps: 1) That is either open or close. 2) One in which flow rate can be varied. Now the tank is kept out open in rain and it is open from top. There is a marking at 8mts and you have to maintain the height.

Now in case 1 (tap that is either open or close): You will keep monitoring the level and when it reaches close to the level, you close the tap and when it increases (due to rain), again you open it. A lot of effort is going in opening and closing.

In case 2 (where you can vary the flow rate): You will keep monitoring the level and when it reaches close to the level, you reduce the flow rate so that it matches the flow rate of water coming in from rain. You can keep it at that level till the time the rain increases and the level increases. But if you are able to manage the right flow rate from tap, you do not have to open or close it again and again.

Which one requires more effort from your side? The answer to it will help you find the answer. Case 1 is regular AC and case 2 is one with inverter compressor.

19

Hi Abhishek, Thanks for your response. I understand the analogy but this is not sufficient to make any decision. Typically regular AC has EER of > 3.51 (for 5 STAR ACs) and Inverter ACs typically 3 STARs have lower EERs. So when does this lowered effort compensates for the loss of energy efficiency? Take my example. I live in NCR (Delhi). I have 2 5 STAR regular ACs. For 3 months May, Jun and July it is extremely hot and the AC runs majority of the time (when in use). My average electricity consumption increases by 700 units monthly for these months. Now switching to an inverter AC (3 STAR from 5 STAR regular AC) how much would I save (or loose)? Please share some ways to analyze the trade-offs. Does thinking of a 3 STAR inverter ACs for replacing a 5 STAR regular ACs make any sense? Please note for the remaining 3 months Aug, Sep and Oct of AC usage the increase in usage is not much (so benefits by savings do not merit the replacement cost).

20
Abhishek Jain (Mod)

There are 3 components in an AC: 1) Condenser 2) Compressor and 3) Evaporator where condenser and evaporator are heat exchangers. The efficiency of an AC depends on the efficient design of all 3. Also there is a refrigerant that flows through these 3 and the efficiency of AC also depends on the refrigerant. For e.g. Godrej uses R290 which is the most energy efficient refrigerant. And you will find that the most efficient Godrej ACs (which are actually very efficient) use R290. You will find a non inverter godrej AC with EER of 3.9 and it is all becuase of refrigerant.

So Compressor is just one component that impact efficiency. However, that is one big factor and that is why inverter tech ACs are in general more efficient.

If you look at the data most BEE 5 star non inverters have EERs between 3.5 and 3.65 (about 80% of the BEE 5 star rated non inverter ACs will be in this range) ... but then there are 20% that go up to 3.95/4 as well .... the price of these BEE 5 star rated ACs is comparable to BEE 3 star inverter ACs ..

As for BEE 3 star inverter ACs, you will find 80% of them above EER of 3.65 and just 20% less than that. So likely hood of a BEE 3 star rated inverter AC being more efficient than BEE 5 star rated non inverter AC is more. But that does not mean that every BEE 3 star rated inverter AC will be efficient than BEE 5 star rated non inverter.

The peak efficiency of a BEE 5 star rated non inverter AC is EER of 4 while that of Inverter ACs is reaching 6. This can tell you that inverter technology does make a difference, but that is not the only factor that determines efficiency. Efficiency will depend on all the components.

Now when does this lowered effort compensate: well, the cooling requirement of your room is not the same always. Heat is more in summers while in rainy season the heat will be much less. In fact even in summer, heat is more in May and less in March. Your regular AC of 1.5 ton will always run at 1.5 ton (or stop when the room is cool) even when your room may just need 1 ton of cooling. When sizing is done, it is done to keep peak summers in mind. So your room may need 1.5 tons of cooling in peak summer, but only 1 ton in march. Your 1.5 ton non inverter AC will always run at peak capacity of 1.5 ton. So when the room need 1 ton cooling, it will overcool the room. Imagine in our analogy, by the time you noticed that the level has reached and by the time you switch off the tap, the level may fall below the height that you want to maintain by the time you switch the tap off. So extra energy is wasted to overcool the room. But inverter AC will run at 1 ton when the room needs 1 ton and it will scale up to 1.5 ton when the room needs 1.5 ton. And there will be no overcooling and wastage of electricity. So there is inefficiency in on off and then overcooling. Both can be avoided by using inverter technology. Here are a couple of links that can help you understand more:

https://www.bijlibachao.com/air-conditioners/understand-cycle-time-of-air-conditioners-frequency-with-which-ac-compressor-turns-off-and-on.html

and

https://www.bijlibachao.com/air-conditioners/power-saver-devices-for-air-conditioners.html

The bigger thing to undertand here is that a star rating is range of EERs. I cannot say that a 3 star inverter AC will be better than 5 star non inverter because each star rating is a range of efficiencies. Most ideal comparison can be made if you compare specific models. In fact in 2018 BEE is planning to merge the star ratings of inverter and non inverter, so that there is no confusion.

The calculator that we have put on this website can give you a high level idea as we have taken Median numbers for each star rating to do some calculations on electricity costs. You can try using the calculator to make some sense of how much will you save if you go for a star rating. But please take those numbers as just a pointer, because a non inverter AC with EER of 4 will certainly be better than an inverter AC of EER of 3.55. The calculator just takes "Median" or the most representative EER rating to do some calculations to help people make a decision. The most appropriate decisions can be made when you actually compare individual models.

So to answer your question: Does thinking of a 3 STAR inverter ACs for replacing a 5 STAR regular ACs make any sense? ..... if you have a new 5 star regular AC, then it will not make sense at all. If your 5 star AC is old 5 star AC (4-5 years old), then it may depending on your usage. This is because efficiencies have improved a lot in last 4-5 years. If your 5 star AC is almost 9-10 years old, then it certainly makes a lot of sense to replace it with inverter AC.

Please note: these star ratings are given to help people make a decision, but then if you want more accuracy in calculations, you need to compare models and look at your tariffs. BEE cannot provide that because every state in this country has different tariff. And every tariff is slabbed (changes based on usage ... is more if usage is more and less if usage is less). It is extremely difficult to give exact calculations because it will depends on your usage, the months when you use it, your tariffs, etc ..... in fact even if I try to do such calculation, it will be difficult for most people to understand it. So star rating makes it simple for most people in the country (irrespective of intelligence and educational level) to buy a product. And more you simplify things, more you loose details.

Another point that I would add is: do not look at it this way that your usage in Aug, Sep, Oct is less so there will be no benefit. There will be benefit in those months as well as compared to your old AC (if you use AC in those months ... even if for 1 hour). What you need to look at is Annual savings and see if annual savings help you recover the cost that you pay to replace the AC.

21

Thanks Abhishek for the pointers to the 2 articles, they are very informative and a detailed response. From where can I get the EER figures of inverter ACs or ISEER figures for regular ACs? That data will be really useful for me to compare and get close to some answer. I hope you are not mistakenly comparing EERs of regular ACs with ISEER of (inverter) ACs in the statements:

"The peak efficiency of a BEE 5 star rated non inverter AC is EER of 4 while that of Inverter ACs is reaching 6. "

"If you look at the data most BEE 5 star non inverters have EERs between 3.5 and 3.65 (about 80% of the BEE 5 star rated non inverter ACs will be in this range) ... but then there are 20% that go up to 3.95/4 as well .... the price of these BEE 5 star rated ACs is comparable to BEE 3 star inverter ACs ..
As for BEE 3 star inverter ACs, you will find 80% of them above EER of 3.65 and just 20% less than that. So likely hood of a BEE 3 star rated inverter AC being more efficient than BEE 5 star rated non inverter AC is more. But that does not mean that every BEE 3 star rated inverter AC will be efficient than BEE 5 star rated non inverter."

ISEER of a regular AC should be more than its EER (I think). Can you confirm? Is there any formula or thumb rule to convert EER to ISEER? On a side note besides merging ratings I think BEE should mandate listing of EER and ISEER for all types of ACs in order to make purchase decision.

In my case my regular AC I have has an EER of 3.51. The inverter AC I was planning on purchasing has ISEER of around 3.7-3.8. I think I will wait for a year to get more clarity. To be honest given the data (I think) the 5 STAR AC is a better deal even if I had to buy a new one. Please critique.

22
Abhishek Jain (Mod)

You can get data for all the AC models on this link: https://www.beestarlabel.com/Home/Searchcompare

This is Bureau of Energy Efficiency's website. In the first row you will get AC (non inverter) and in last row you will get Variable Capacity Air Conditioners (Inverter ACs).

Also if your query the data for non inverter ACs ... BEE mentions same value for: "EER(W/W) & Equivalent ISEER" .... so based on the calculations BEE mentions that ISEER of inverter and EER for non inverter is comparable. And that is why I used it interchangably in my response. My apologies if it created confusion.

Also BEE has already mandated listing of EER and ISEER of all types of ACs. In fact in future they are focusing more on annual electricity consumption units rather than EER/ISEER values because annual electricity consumption numbers is a concept easy to understand as compared to EER/ISEER.

23

I am no expert but based on https://servicechampions.com/difference-between-eer-and-seer/ they are not comparable. Also electricity units used is direct derivation from ISEER so the 2 are equivalent in some ways. On BEE website I only see EER for regular ACs and ISEER for inverter ACs (not both). But I do see Seasonal Energy Consumption (CSEC)) (kwH) for regular ACs and see a difference of 120 units. Not sure if this is accurate? BTW how do manufacturer calculate/report electricity consumed figures? Do they really run the ACs in the test conditions for as many hours? It'll take a year for them to find get data... or do they calculate it mathematically based on EER measured at various operating conditions?

Any ways thank you for explaining details. I think I understand a lot more now.

24
Abhishek Jain (Mod)

Hi Sumit,

The test conditions for measuring the power consumption and cooling capacity are the same for both inverter and non inverter ACs and are as per IS 1391-2. They do not test it round the year, but only in certain test conditions and then extrapolate it for the whole year. Because the test conditions are same the EER and ISEER values come out equivalent because EER or ISEER is essentially Output/Input (or cumlative output/ cumlative input). Now if we assume fixed speed AC has constant output and contant input when the compressor is on, then even if you take cumlative output and divide it by cumlative input (to calculate ISEER), it will remain the same value. I am attaching a screenshot (link: ) from BEE website where it says EER and Equivalent ISEER in heading for the search results.

Manufacturers have to get their products tested at a NABL certified laboratory and have to submit the results to BEE to get certification. But they do not test it for the whole year.

25

By "AC runs majority of the time" I mean the period compressor runs when AC is on.

26

Dear Abhishek Bhai,

i request you to help me figure out the best inverter AC based on below.
I have 12*10*10 room which direct gets sunlight on roof (Top Floor)
No south- west wall gets direct sunlight.
No falls ceiling is made in room.
Place - Hyderabad.
Months in a year AC used- 4- 5 Months.
Do you recommend me 5 Star inverter AC or 3 star inverter AC?

Thank You

27
Abhishek Jain (Mod)

Hi Prashant,

Your room would have needed 1 ton AC had it been on lower floor. But due to top floor, you need 1.2 tons of cooling. A 1.5 ton inverter AC would be safer, but you may also opt for 1 ton AC (as they can stretch to 1.2 ton). But then 1.5 ton would be safe. You should go for a BEE 3 star rated AC as your usage is not high. What is your budget for this AC?

28

Thank you Abhishek Bhai,

I am gratified to see your remark and advice.

My budget is 40,000 INR. It would be much helpful if you could recommend a few 3 and 5 star Inverter ACs. I have browsed few websites and found some manufacturer says dual inverter. I am kind of not sure which brand, which technology i should go for.
I am not happy with my first purchase LG 1.5 Ton 5 star AC (BOUGHT WITHOUT YOUR RECOMMENDATION) for my Top floor with false ceiling, 18*12 feet master bedroom. It does not cool the entire room. It just cools the place where it throws air. Corners of my room don’t feel like AC is running.

29
Abhishek Jain (Mod)

For 18x12 bedroom your cooling requirement is 2.2 tons. So 1.5 ton will always be insufficient. I do not think that the AC is bad, but the purchase is wrong. One thing that you can do is: move this 1.5 ton AC to your 12x10 room and get a 2 ton inverter AC for your master bedroom. But then 2 ton inverter AC will be costly and you would not get one in 40K budget. Also LG is the brand that sells dual inverter AC. It is a better technology but then electricity consumption depends on multiple factors and not just the inverter compressor. Otherwsie in a budget of 40K if you are looking for 1.5 ton inverter AC, then models from LG with BEE 3 star and dual inverter are quite good.

30

Hello Abhishek Sir,

Thank you very much for your fruitful replies.
Could you suggest me some brands and Models. I can extend my budget,
Thank You again!

31
Abhishek Jain (Mod)

You can look at any of these BEE 3 star rated inverter AC. But then they would certainly be costly:

BLUESTAR 3CNHW24TAFU
HITACHI RAU324EWEA
HITACHI RMB324IAEA

32

Hello Everyone, I am From Mumbai and i have purchased Invertor AC of Electrolux Brand of 1.5 ton, It is almost 3 months the problem which I am facing is when i switch off AC from Remote AC Flap which is a part of Indoor Unit it gets close after 15 to 30 seconds. An ordinary AC's Flap get closed immidieately when Power OFF from Remote. I complained in Service Centre but they are explaing me that In invertor technology there is Sensor which gets wet as soon as it gets little dry Flap gets off. I am fighting with them to replace my product. But the problem which i am facing is sometime it turns off immideiately and somtime its take more then 15-30 sec. And also Gas reduced by 30 points after a month they filled full gas. Can anyone tell me what should i do. Should i use the product or complain for the following things ?

33
Abhishek Jain (Mod)

Hi Jaideep,

I am not able to think of any reason why your AC's flap is getting delayed in closing up. Electrolux engineers can help you the best.

34

Dear sir,
I live in Coimbatore, TamilNadu. I am almost close to completing an office building where I would like to understand the applicability of VRF/VRV vis-a-vis Split inverter ACs.
The dimensions are as below.

a) 2 enclosed glass cabins of size - 10 ft length X 10 ft width X 10 ft height.
b) 1 big hall - 28 ft length X 20 ft width X 10 ft height
c) 1 enclosed conference hall - 10 ft length x 16 ft width x 10 ft height
d) 1 enclosed work area - 7.5 ft length X 8 ft width x 10 ft height

I am considering if I should go for VRF/VRV OR Split Inverter AC. Are there any disadvantages to be taken care while going for VRF AC like service support, spare parts etc., I am told we need to contact the original manufacturer, send email/get approved etc.? Is it true that service support is difficult for VRF?

Or should I just go for individual inverter split ACs?

Please suggest.
Thanks

35
Abhishek Jain (Mod)

VRVs save a lot of space as there is one outdoor unit for multiple indoor units. It may also help you reduce size/tonnage in case you know that all the ACs will not be operated at the same time as it can balance the load. Having a single outdoor unit also makes it easier to maintain (so AMC costs should work out better).

But then there is a single point of failure, so if the outdoor unit fails the whole office will not have cooling. Costs of buying VRV is higher as compared to having multiple split units.

Service support is provided by manufacturer in both VRV and individual split if you go for extended AMC from the company. However, your local AC guy may be aware of individual split but may not be so well versed with VRV unit.

There are pros and cons for both the setups and it is quite difficult to say which one would work out best. In case you feel that not all parts of your AC will be used at any given time and the load can be balanced based on place of usage, then go for VRV as you can go for smaller tonnage system with VRV.

36

By the way, is it true that the VRV is double the cost of Split Inverter ACs for the same tonnage?

37
Abhishek Jain (Mod)

I am not completely sure on the percentage, but VRVs are certainly expensive for the same tonnage.

38

Thank you very much for your answer!

39

Hello!
I live in Ahmedabad, where the temperature is mid high 40's during summer.
So i am planning to buy 1.5 Ton inverter AC as my budget is around 28-30K.
I searched and found 3-4 brands within my budget!

Intex SS183TC-CB ; Sansui SS4C54.WS1-CM ; Onida INV18SNO ; Hyundai HS4I54.GCO-CM ; Mitashi MiSAC15INv20.

Can you suggest me most power savings and efficient from them.?
Also which company has better after sales services.
Usage will be upto 10 hours in summer.

Actually i want 3 ac for my flat, according to measurement 1.5 ton is enough.
If you can suggest which will be better for bedroom and hall.(2 each for separate bedroom).

40
Abhishek Jain (Mod)

Hi Vaibhav,

Hyundai and Sansui, both are good and energy efficient. You can go for any one of them:

Hyundai HS4I54 (Flipkart Link: http://fkrt.it/R6Scr!NNNN )
SANSUI SS4C54 (Flipkart Link: http://fkrt.it/RCY5Y!NNNN )

Difficult to comment on after sales service as these products are mostly sold online. The overall feedback on Sansui model (on flipkart) is quite good.

41

Thanks for the reply.

I am confused as Intex SS183TC-CB, is providing 10 years warranty, has it good built up quality as branded AC's.?

Also as I wanna buy 3 ac, I wanna be sure which AC to buy.
Which AC will be having higher ISEER.(To my understanding higher the better for power saving.)

What will be the difference between Branded Companies Ac's (Mitsubishi, Diaken, Panasonic, Hitachi) vs The Companies as discussed by us.

Also is there any better inverter ac upto 25-35k.?

42
Abhishek Jain (Mod)

LG models that I gave you will have better ISEER.

43

Thanks for reply.
What will be difference between branded companies (Mitsubushi,Hitachi,Panasonic,Diaken) vs non-branded as discussed above.

How about Intex which is providing 10 years warranty on compressor.?

https://www.flipkart.com/intex-1-5-ton-inverter-split-ac-white/p/itmes9ghrh4yesk3?pid=ACNES9GH5XR3HYQC&srno=s_3_11&otracker=search&lid=LSTACNES9GH5XR3HYQCAWPHXQ&fm=SEARCH&iid=408f8703-4a58-4027-8340-6c083478235a.ACNES9GH5XR3HYQC.SEARCH&qH=ee778a034e73d39a

Can you suggest best 3 star inverter ac between 28-35k.?

I am asking again as i wanna buy 3 ac so wanna be sure which 1 to get, which will be the most power efficient, from above which ac's ISEER will be highest.?

44
Abhishek Jain (Mod)

Hi Vaibhav,

Better brands add to the reliability and durability. Their performance will not degrade fast as compared to lesser known brands. You can be assured of consistent performance (with very less derating or loss of performance) for a long duration. Which is not a certainity with lesser known brands. Ideally you have to strike a right balance between price and brand value. Premium brands can give you best technology, features, etc, but then they are expensive. Very cheap brands will not last long and do not provide much features as well. I personally think that brands like LG, Voltas, etc strike a great balance between price and technology/features. And that is the reason they enjoy the highest market share in India. If you can go for any of these, then that would be great:

LG JS-Q18CPXD (Amazon Link: http://amzn.to/2xOOtsx )
LG JS-Q18PWXA (Amazon Link: http://amzn.to/2iK58Li )
LG JS-Q18NRXA (Flipkart Link: http://fkrt.it/wQ3mj!NNNN )

As for the most power efficient from your list, I gave you the most efficient one in my previous reply.

45

Thanks Abhishek for your valuable input.

After your recommendation, Now I am planning to buy LG JS-Q18NPXA or JS-Q18ATXD.
My only concern is that, in few sites its written "Aluminium Condenser instead of Copper".
So should I go with Aluminium Condenser as I have read your reviews section that copper will be better for long run.

Also My drawing room is open and also kitchen is open so I fear that I should go for 1 5star AC for drawing room and 2 3star inverter for bed room.

Which will be better 5star power saving AC.?
I searched and found Voltas 185JY (Aluminium) to be good and cheaper.
Any other option for 5star AC within 30K (Good Company).? Copper Condenser preferable.

46
Abhishek Jain (Mod)

Hi Vaibhav,

Both aluminium and copper can corrode, what is important is corrosion protection. The other advantage of copper is that it can be repaired. Aluminium one needs to be changed if it corrodes. If you live in corrosive area (close to sea, lake, river or nalla or close to chemical factory), then I would suggest you to avoid Inverter AC itself. But if your area is not corrosive, then both alloy and copper would be good. Alloy provides more energy efficiency as compared to copper. But then copper is easier to manage in a corrosive area.

These days LG and Samsung (brands that mostly sell aluminium condensers) both provide very good corrosion protection for their condensers. They give 5 years warranty on the condenser itself. If you want to go for Copper condenser then the AC will get a bit expensive. If you want copper condenser, then you can check these:

LG JS-Q18SUXD (Amazon Link: http://amzn.to/2oMG2Le )
LG JS-Q18AUXA (Amazon Link: http://amzn.to/2oMjWqB )
Blue Star 3CNHW18TAFU
Voltas 183V EY (Flipkart Link: http://fkrt.it/j34ZwTuuuN )
Voltas 183V IY (Amazon Link: http://amzn.to/2r23ghH )
Blue Star 3CNHW18NAFU

BY the way I have personally used an LG model with aluminium condenser for 7-8 long years without any problems. Usually the problem happens when the environment is corrosive. But you can judge better. If you go for cheaper copper models, then you are not very sure on long term reliability and efficiency.

As for 5 star AC, I think Voltas would be the best brand in sub 30K budget. Even in Voltas you have a mix of copper and aluminium condenser. So you will have to check with a dealer before buying. If you want sureity of copper condenser, then you can go with Lloyd ACs. They are also good.

47

Hi Abhishek,

Using Blue Star Inverter AC (3CNHW18NAFU 1.5 TR) for past 3 months, if i set 23 and using an hour after that changed to 28 the compressor getting stopped(ODU fan also) and its starting after sometime(temperature might be increased above 28). Is it odd behaviour or working properly ? If you say its working properly, then what is the difference of Inverter AC and Non-Inverter AC. I've already gone through your article regarding this. Still i'm confused. Please be specific to Inverter AC and provide your suggestions on this. Thanks in advance.

48
Abhishek Jain (Mod)

Hi Arul,

To explain it, let me give you an example. Imagine you have a water tank 10 mts tall. It is kept open in rain and you have to maintain water level in the tank. You put a tap in which flow rate can be varied (just like your regular taps) and additionally you put a sensor that can measure the height of water in the tank. So you have inflow to the tank in form of rain and outflow from the tap. Now you first adjust the sensor to height of 2 mts and the tap & sensor make sure that the water level is maintained to 2 mts in the tank. And then suddenly you change the height to 8 mts and you expect water to come out of tap. But it does not, because the water is at 2 mts and not at 8 mts. So the sensor does not open the tap.

Now this tank is your room, rain is heat from outside, tap is your AC and water level is temperature level that you set on your AC. If you first set it to 23, the heat in the room has been removed to a level that the temperature now is 23. Now you change it to 28, there is no heat to be removed (because heat level, just like water level is so low that there is nothing to be removed). There is no point for compressor to work at this stage and that is what is happening.

Now imagine there are two kind of taps:

1) In which you can vary the flow rate, at the begining when water level is too high, you open it fully so that water comes out at fastest rate. But as water level comes down, you reduce the rate so that height of water is maintained (so that the rate of water that is coming in from rain is the rate of water going out from tap). The water still comes out of the tap but at a slow rate. This is how you mostly use your regular taps at home.

2) Second kind of tap is one which is either open fully or completely closed. So when the tank is full, the tap opens up fully and the water gushes out of it at fastest rate. It does not slow down when the level desired reaches, but as the level reaches, sensor sends a signal to the tap to close and by the time it closes, the level goes down slightly below the level you have set. The sensor again waits for the level to go up slightly more that the level you have set and it again opens the tap and it opens fully and the water gushes out of it. The challenge in this setup is to maintain the level properly. It is either slightly more or slightly less.

The 1st tap with variable flow is like inverter AC and the 2nd one is like non inverter AC.

Bottomline, your AC is perfectly fine. If you want to maintain temperature at 28, just start it at 28 and not at 23.

49

Hi Abhishek,

Thanks for your prompt reply. Kindly clarify this too. I'm using my Blue Star 3CNHW18NAFU 1.5 T Inverter AC at 28 for an hour and changed to 23(outdoor temperature ~ 26), the compressor is running upto reach 23 and its stopped, after sometime(~ 10 mins) its starting again and its stopped once its reached again 23. In this case, it should not be stopped right instead of maintaining the temperature at 23(thats means compressor should run at low speed). Please correct me if i'm wrong. The same scenario i tried with Daikin FTKP50RRV16 1.5 T AC, the compressor is still running at low speed. Blue Star technicians came and told now days Inverter ACs compressors are designed like would be cuf-off once its reached set temp. Please advice on this.

50
Abhishek Jain (Mod)

Can you try keeping it at 20 and see how it behaves? Ideally it should not stop and your understanding is right that it should run at low speeds.

51

Hi Abhishek,

I tried running my Inverter AC(Blue Star 3CNHW18NAFU 1.5T) at 20, it was stopped after reached 20, after sometime it started again and ODU Fan running high speed(unable to see compressor motor speed) and amps shown 7. At the time of compressor off only, amps decreasing from 7. Doubting whether i'm really using inverter AC or not. Technician came again and said, its normal behavior of inverter AC. Kindly advice on this. Thanks.

52
Abhishek Jain (Mod)

Hi Arul,

If you are running your AC at 20 then the compressor should not stop. That is not how an inverter AC works. It can slow down the speed of the compressor, but will not stop. It is not normal behaviour of inverter AC.

53

Hi Abhishek,

Technicians say, compressor would run up to reach 20 then sustain the same temp. for sometime and cut-off, after a while thermostat senses more than 20 the compressor would start run again. However I've called technicians again tomorrow. Please advice what are all the scenarios need to be tested to validate whether i'm really using Inverter AC or fixed speed AC. Thanks.

54
Abhishek Jain (Mod)

The way that they have explained is how a fixed speed AC works and not an inverter AC.

55

I see LG has a range of Dual Inverter ACs. Does this offer any advantage or it is only a marketing gimmick?

56
Abhishek Jain (Mod)

Dual Inverter ACs are quiters and faster in picking up speed. So they certainly have advantage.

57

Thanks Abhishek. It is good to know that there is an advantage. I still have some doubts:-

1. Does it mean that none of the others do not have the dual inverter technology, or do they call it something else?
2. Would you know where are the two inverters used within the AC? My understanding is that the compressor of an inverter ACs run on a DC motor which runs continuously and the performance is increased or decreased by varying the speed of the DC motor. So, it is hard to comprehend what a second inverter would do in such a situation.

58
Abhishek Jain (Mod)

Here is my response:

1) LG is the first one to get dual inverter technology in India. It was developed by Toshiba in 2004 (source: http://toshiba-mirai-kagakukan.jp/en/learn/history/ichigoki/2004compressor/index.htm ). Internationally other brands also use it Check this video from Samsung:

It certainly has benefits, although for energy efficiency, compressor is just one of the components and the whole system design has to be efficient. Dual Inverter is better than regular inverter, but then the whole design has to be good for better efficiency. And that is why many regular inverter ACs are also more efficient than Dual Inverter ones.

2) Dual Inverter AC does not have two inverters. It has Dual Rotors (or it is Dual Rotary Compressor) and an inverter to vary the speed of the two. You can read more about it on this link from Purdue University: http://docs.lib.purdue.edu/cgi/viewcontent.cgi?article=2982&context=icec

59

Thanks a lot Abhishek for your prompt response. Appreciate it as i need to finalize in a day or so. And thanks for the extremely useful info on your entire portal.

1. I am at Dadar east, so its not near sea, but all windows are west facing and it is fully open on that side.. So windows get good amount wind/breeze. Also during monsoon, the rains hit comparatively harder, since its west facing and open.
Trying to judge if based on these factors, i should term my place corrosive OR since i am fair bit away from the sea, I am ok and the west facing and rain factor won't make it that corrosive?

2. Keeping corrosion and environment factor aside - how would you compare the MS GK/HK (copper) series vs LG/HL (aluminium) ? And which of the 2 series you would recommend and why?
Does GL have any advantage over GK in any aspect for non-corrosive environment?

3. I have a L shaped living and dinning leading to open kitchen -- total amounting to about 470 sq ft (without any partition) .
I am planning a 2 Ton on top of living window (such that it has rectangular area of 250 sq ft). and
a 1 or 1.5 ton on top of the open kitchen entrance in the "L" passage, such that it is blowing air to dinning area in the passage.
Do you think 1 ton may be ok or should i go for 1.5? (We don't need it to be too cold, 25/26 would be good).

If at times when we are just 3-4 people sitting in the living area, if i just switch on the 2 Ton AC and not switch on the 2nd one, I understand cool air will leak in the passage leading to kitchen, but it may still be enough to give us cool air at seating area which is close to the 2 ton AC on top of window.
In that case, will 2 Ton be continuously operating at 13.65 amp that you mentioned in one of the posts and not fall to 7.5 amp which you mentioned happens in case when 2 ton AC is running at 1.8?
And if yes, would this be inturn worse electricity wise than keeping both ACs on, so that the 2 ton doesn't continuous at 13.65 and in net both will still use less electricity?

4. For the above living/dinning space, I am wondering if i should think about Daikin 1.8 and 1.5 or ME 2 and 1/1,5 - because of total about 10K cost difference between Daikin and ME for both... Or if i can afford the extra 10k would you suggest to go for ME between the 2..

Again thanks for your tremendous help !

60
Abhishek Jain (Mod)

Hi Keyur,

Here is my response:

1) Dadar East should not be corrosive. Mostly areas that are in the radius of about 3-4 kms from the sea are corrosive.

2) I would suggest GL as it has better energy efficiency and it also has long air flow, so it can cover a longer distance and area.

3) Total of 3 ton should be good enough for 470 sq ft in Mumbai (unless you have a ceiling or walls exposed to sunlight in which case 1.5 ton AC would be good). You can use the 2 ton AC most of the time and use the 1 ton only when needed. It will make it comfortable enough. If you only run a 2 Ton AC, it will mostly run at peak capacity all the time (especially during peak summer months). But it will still be more economical than running two ACs together. The amount of current will vary only in case you go for inverter technology air conditioner. If you are going for non inverter, then it will always run at peak current (compressors in non inverter ACs work in on/off mode, so they are either on at full capacity or they are off). Running one AC at a time is always most economical.

4) You can go for Daikin 1.8/1.5 if that is working out more economical. Daikin is a good brand and the extra 10K for ME may not have ROI.

61

Thanks a lot Abhishek.

Last few follow up Qs to help me conclude between for ME vs Daikin for the given space.. Sorry for the long read.. but responses to the specifics below, will help me nail it down.

470 sq ft "L" shaped living+dinning is ~260 (24 x 11) in front of the 2 ton AC (The AC is on the 11 ft wide side). The seating area is right next to this AC.
And the rest ~210 sq ft is the 2nd side of the "L" which doesn't directly face this 2 Ton AC.
The 2nd smaller AC (1.5 or 1) will serve this 2nd side of the L. Dinning table is on this side.

Like you mentioned above I can use the single 2 ton most of the time and switch on the 2nd one only as needed.
When only single machine is on --- would Daikin 1.8 ton be able to serve this 260 sq ft area along with the leakage to the 2nd side of the L ---- almost comparably to the ME 2 ton machine or would it noticeably underperform
a. wrt the slight tonnage difference

b. airflow difference - ME 2.0 has 777 CFM, daikin 1.8 has 16.6 CMM (586 CFM) --- Numerically the CFM difference seems large.. Not sure practically how it affects in my above setting with 24 ft length
NOTE - My seating is close to the AC - all in the first 14 ft near to the AC of the 24 ft.. So if the airflow difference only affects towards the end few ft of the 24 ft or the overall room?
Depending on that, the CFM difference may or may not materially matter to me..

I read online that approx CFM ideally should be 350-400 per ton. From that aspect Daikin's seems a bit lower.. So If you can help evaluate the 2 options from CFM perspective for my use case..

c. Does the 2nd side of L space where cool air of this 2 ton will leak -- affect which one we choose above..

note - the difference in cost between ME 2.0 and Daikin 1.8 is 8000

d. To determine 3* or 5* for this 2 or 1.8 ton --- I can go based o nthe cost saving from your calculator.. But since this is L shaped space, I am wondering what size i should input in the calc to determine the energy comparison... would it be right to just input 24x11?
Would the large open leakage space due to L - be a factor in me choosing 3 or 5 star for this AC?
Considering 3-4 hour of day time usage, which * would you suggest?

e. for the 2nd smaller machine to serve the 2nd L side --- would you suggest 1 or 1.5? Would this 2nd one differ depending on if 1st one is ME 2.0 or Daikin 1.8?

f. If I am just sitting in the dinning space which is served by the 2nd machine and just need cooling there, is it ok if i just keep the 2nd machine on (and not on the 2 ton one)? Or would be air leak in this side be too much for the 1 / 1.5 to take..

Thanks a bunch.

62
Abhishek Jain (Mod)

Here is my response:

1) Although 1.8 ton should be sufficient for 260 sq ft space, because the area is bigger, you will certainly feel the difference between 1.8 ton and 2 ton. However, you need to look at the cooling capacity and not just the marketing tonnage. Ideally 1 ton is 3504 watts cooling capacity, so 2 ton should be 7008 watts. But many a times manufacturers mark 1.8 ton as 2 ton as well. So do not just go by marketing tonnage. Also look at the cooling capacity of specific models. If there is significant difference, then ther would be slight impact of more cooling capacity. But it is not that 1.8 ton will make you feel uncomfortable. Just that 2 ton will make it cool faster.

2) More CFM impacts the cooling distance. Faster air flow takes cool air to a long distance and thus the impact of cooling is in a larger area if CFM is more. So ideally in your case you should go for larger CFM. Cooling depends on cooling capacity as well as CFM. If cooling capacity is really high (as compared to room's requirements) then even with slightly lesser CFM, the room will cool properly. But if cooling capacity is low, higher CFM will be required to take it to a larger area.

3) The more I go through your comment, more I feel that you should go for 2 ton AC from ME.

4) Your room's total requirement would be about 3.5 ton. So 1.5 ton for the smaller side would be needed.

5) When you are sitting in dining space, just keep the 1.5 ton AC on and do not start the 2 ton AC.

6) For 3 hours usage mostly in summers, from an ROI perspective, I think 3* will work, but then please note, 3* is almost the least efficient product in the market (there are hardly and 1 and 2 stars). If you notice the trend in AC market, you will see that there are hardly any 1,2 and 4 star non inverter ACs in the market. It is mostly 3 and 5. This has happened over the years depending on consumer trend. People only ask for 3 and 5 (even in inverter ACs). Star rating was introduced for inverter ACs last year and based on numbers, there were 3, 4 and 5 star inverter ACs initially. But within a year, manufacturers have stopped making 4 star and there are either 3 star inverter ACs or 5 star (very few 4 star). And 3 star inverter AC is slightly better than 5 star non inverter, which makes 3 star non inverter almost the lowest in efficiency. So you may go with 3* based on your usage, but if electricity costs increase significantly in future or your usage increases, then it will start increasing your electricity bills.

Mostly in Mumbai I do not recommend people to go for less than BEE 5 star non inverter as the electricity costs are really high and they are increasing year on year. But your usage is low, so you will have to decide.

63

Thanks a lot Abhishek.

1. regarding your cooling capacity point --- the Daikin 1.8 is 6.4 kW and ME 2.0 HK (3*) is also 6.4; but ME 2.0 GK (5*) is 6.6.
(I guess they are both less than the ideal 7 kW that you mentioned... seems MHI 2 ton is 7kW that you mentioned).
So from cooling capacity, is there much to choose from between the 2? It seems ME 2.0 is also more like 1.8?

2. CFM point - yeah ME seems quite more in this parameter..
NOTE - My seating is close to the AC - all in the first 14 ft near to the AC of the 24 ft.. So with smaller CFM would that only affect the end few feet? OR because the room length is more and additional the L side space -- makes CFM matter for the area closer to the AC also?

3. 3* vs 5* --- sorry i meant ~ 3 hours everyday (not just summer) - because there is some noise outside due to which i may keep windows closed for approx 3 hrs daily..

In your calculator if i input the area as 24x11 (excluding the portion in L) with 3 hrs every day -
3* non-inv elec is 10359 and 5* non-inv is 9455 - so ~1k difference.

You anticipate that calculation to not hold true because of the L space leakage, and the elec difference be much worse than the 1k above? Or would anyways the ac work continuously even for 260 sq ft irrespective of the L space and the calculation would hold true?

thanks !!

64
Abhishek Jain (Mod)

Here is my response:

1) 6.4 kW is 1.82 ton and 6.6 is 1.88 ton. The difference is not much. So the Daikin models and ME models are quite similar in cooling. The only difference will be in CFM which will help in covering larger area.

2) If seating is close to the AC, then CFM will not matter much because as it is you are not targetting to cool the area that is far.

3) The numbers in the calculator are taken from BEE data. Firstly numbers from BEE are in test conditions and they can vary based on real life situations. Also in your case the AC compressor will run longer as you are undersizing the AC (running single 1.8 ton for 470 sq ft). So the difference will be bigger than 1K. I would expect it to be about 2K (with all assumptions). So that will be Rs 2000 per year extra on electricity bills. Price difference would be about Rs 5000 between 3* and 5*. Also the calculator assumes maximum tarriff (assuming that you are in last slab .... this has been done assuming that people with ACs in home usually tend to be on later slabs).

65

Thanks a lot Abhishek. Very useful.

Since we went a bit between the choice of ME 2.0 (actual 1.82/1.88) and Daikin 1.8... just wanted to conclude and go for the one !!

1. Since cooling cap is very much comparable; and CFM is the only difference (777 vs 586), -- as long as I ignore the last few feet of 24, in my core 3/4th of the length, I will still get comfortable cooling?
(Does the open leakage on the 2nd side of L, have impact here wrt airflow, or does larger airflow just serve more the straight length in front of the AC).

Would you say there may not be much to choose ME 2.0 over Daikin 1.8 or like earlier in our conversation do you think its still better to go for ME based on CFM?
OR if any other reason product wise you may have preference of any one

EER -
a. In 5* - ME is 3.57 while Daikin in 1.8 only has upto 4* so is 3.45... (I think this may be ok, if CFM/cooling wise Daikin is ok)
b. In 3* - Daikin is better 3.25 vs ME 3.17
(also for other AC's 1.5 in "L" and 1 TN in bed rooms --- EER of Daikin is similarly slightly better than ME)

Also based on your experience with the 2 brands - can i assume that actual translation from the spec numbers to what i would get practically -- would be similar between Daikin and ME.. and if any gaps between practical what i get and spec, would be similar for both ?

thanks a lot. Your support is surely helping me a lot to satisfactorily make the decision !!

66
Abhishek Jain (Mod)

Hi Keyur,

I think I have already given a lot of information for you to decide which one to go for. I will not be able to pick one for you. You will have to decide on that. CFM will cover longer distance but you will have to decide if you want it to cover longer distance or the seating is close to the AC. I have already mentioned, CFM helps cover longer distance but Cooling capacity is the one that impacts cooling.

Both are premium brands and I would not be able to pick one among the two. You will have to decide on one based on your brand preference.

67

Just to clarify, in the above Q i am referring to non-inverter ones.

68

Need help to select between MS-GK vs MS-GL (similarly MS-HK vs MS-HL in case of 3 star). I understand 1 difference between the GK and GL is the Gas 410A vs 32 and sort of understand that aspect.

But i also realized there is another difference between them wrt the heat exchanger / condenser coils.. GL uses Aluminum - Multiple Flat tubes..
GK i believe is copper - is it also in form of Multiple Flat tubes in copper or is it the conventional copper coils?

I am trying to determine which model is better in this aspect and wrt durability, maintenance, repairing etc ?
Does the new technology with Aluminum, just overcome the traditional disadvantages of using aluminum coils and makes it equal to the copper one? Or is the Aluminum multi flow now actually better than the copper ones?

Note - I stay in Mumbai, if that influences which one to choose...

Thanks a lot for your assistance !!

69
Abhishek Jain (Mod)

Hi Keyur,

If your environment is corrosive (you live quite close to sea or a water body) then any metal would be prone to corrosion. Be it aluminium or copper. Most modern aluminium condensers are actually aluminium alloy condensers that are much better in corrosion resistance as compared to the ones in past. But then if the environment is highly corrosive, any of those can fail. Even the copper one can fail in corrosive environment.

The benefit of the copper design is that it can easily be fixed. Micro channel aluminium alloy condensers are difficult to fix in case of corrosion. But micro channel condensers offer better surface area for heat exchange, so in general they are better for energy efficiency.

I can also tell you that I have personally used an AC with aluminium condenser in Mumbai (powai) for 7 years without any problems. Usually problem happens only when the environment is corrosive.

Brands these days give more warranty on Aluminium condensers. You can get up to 5 years warranty on condenser. Which can give you more confidence in buying an aluminium condenser model.

If you are close to the sea, then I would say go for copper one. Else you can go for anyone of them. And yes the copper condenser is conventional copper coils.

70

Can you please share your opinion regarding the hot and cold ACs like Carrier 365 inverter, etc. Are these acs good buy in terms of technology, power consumption? Also for 1.5 ton can you please suggest some good models?

71
Abhishek Jain (Mod)

Hi Kunal,

If you want to buy hot and cold AC then you must go with one with inverter technology as the non inverter ones are not very energy efficient. Carrier 365 inverter would be a good choice, but if you want the most efficient ones then you can look at Blue Star 5HNHW18PAFU or Daikin FTHP50. These are great models.

72

Hey sir,
I have shortlisted 3 AC's-
1) Daikin Jtkm50
2) Lg bsa18 beyd

3) Lg qs18 npxa

Daikin offers 1 year complete and 5 years compressor warranty
Both Lg AC's- come with 18 months complete warranty,5years condenser warranty with gas charging,and 10 years compressor warranty.

My question is that which one out of the following is the best one also keeping in mind the massive difference in warranties offered?

73
Abhishek Jain (Mod)

Hi Akarshan,

Daikin JTKM50 is a BEE 5 star rated inverter AC, LG BSA18BEYD would be BEE 4 star rated inverter AC and LG QS18NXPA would be BEE 3 star rated AC. Which means in terms of saving electricity, Daikin JTKM50 would be most efficient and LG QS18 would be least efficient. But having said that, Daikin JTKM50 will also be most expensive and LG QS18 least expensive.

The right choice will depend on your usage of AC and cost of electricity in your house. If you plan to use it more than 2500 hrs a year, then you MUST go for Daikin JTKM50 (unless you are in Goa where cost of electricity does not go beyond Rs 4 per unit). If your usage is about 1000-1500 hrs a year, then LG QS-18NPXA would be most reasonable value for money product.

As far as warranties are concerned, they are more related to durability "perception" of products in market. Daikin is a premium brand and works fantastic for most people. They use good products and their ACs usually last long and that is why they do not have to offer longer warranties (one because they are confident that their products will work, secondly most buyers also believe them). In case of LG, in past they got some bad reputation because they used aluminium condensers which were not of good quality and they used to fail due to corrosion. They have changed their technology significantly in past few years, but still the perception that people have persists. To overcome that perception challenge LG gives more warranty.

74

Will Lg bsa 18 beyd be a good choice for 46000 considering the fact that it is made in Thailand while Daikin is now made in India.

75
Abhishek Jain (Mod)

LG BSA18BEYD is a great machine and highly energy efficient. You can certainly go for it. At 46K it is a good buy.

76

Thank you very much for your response.
I have bought BSA18 BEYD and am very much satisfied with the product.
Surprisingly,the Ac consumed only 3 units for 6 hours of continuous operation on 40% of ACTIVE ENERGY CONTROL MODE.
I am really grateful to you for all yours efforts to save electricity by helping people.

I feel really happy to be a small part of your movement.

Just one doubt remains...
Has the overall quality of Daikin Ac' s degraded even by a small margin since their production began in India,or all such comments on the internet regarding them are hoax?

77
Abhishek Jain (Mod)

There is some reality and lot of perception about Daikin. I do not think that Daikins made in India are too bad. It may be slightly better if made outside. But then whatever is made in India is not too bad at all. I have personally seen many Daikin (made in India) and they are working fantastic wherever they are installed.

78

Thank you for clearing the confusion sir.

79

Hi Mr Abhishek,

Thanks for explaining in details about ac in blog and queries of people.

I live in jalandhar punjab. Currently having 2 stars carrier durakool model which is having load of 10.5 A. Total units consumed are 2.5 approx per hr. Usage is approx 10-12 hrs per day . This is causing big hole in pocket.

Visited market to look out for energy efficeient ac but got confused with lot of option s across different brands and power rating ( star ratings / inverter / non inverter/ dual inverter/ coil type copper or al ).

Room size is 150 sq feet (15*10*10). On first floor. Sun light falls from 3 sides including roof top.

Can you suggest ac for me .Budget approx 40 k.

80
Abhishek Jain (Mod)

Hi Ashish,

I think BEE 3 star rated inverter AC of 1.5 ton would be good for you. You can look at these:

LG JS-Q18SUXD (Amazon Link: http://amzn.to/2oMG2Le" rel="nofollow" target="_blank">http://amzn.to/2oMG2Le )
LG JS-Q18AUXA (Amazon Link: http://amzn.to/2oMjWqB" rel="nofollow" target="_blank">http://amzn.to/2oMjWqB )
Blue Star 3CNHW18TAFU
Voltas 183V EY (Flipkart Link: http://fkrt.it/j34ZwTuuuN )
Voltas 183V IY (Amazon Link: http://amzn.to/2r23ghH )
Blue Star 3CNHW18NAFU

The above are all copper condenser. You can also look at these:

LG JS-Q18ATXD (Amazon Link: http://amzn.to/2plxzkK )
LG JS-Q18AFXD (Amazon Link: http://amzn.to/2oA2VBg ) similar model with different design
LG JS-Q18CPXD (Amazon Link: http://amzn.to/2oA7Ban ) … this is an Amazon only product and I doubt you will get this in market.
LG JS-Q18NPXA (Amazon Link: http://amzn.to/2oA6Nm5 )
LG JS-Q18SUXD (Amazon Link: http://amzn.to/2oMG2Le" rel="nofollow" target="_blank">http://amzn.to/2oMG2Le )
LG JS-Q18AUXA (Amazon Link: http://amzn.to/2oMjWqB" rel="nofollow" target="_blank">http://amzn.to/2oMjWqB )

Any of these BEE 3 star rated inverter ACs would be good. LG would be quite value for money.

81

Hi Abhishek,

I am buying new flat in Chennai and so planning to buy 4 new ac 3 for bed room 1. 5 ton(10*11 ROOM) and 2 ton for hall(12*15) HALL.
I am getting confused which one to buy.
LG INVERTER AC Model 18VGU for 1.5 and 24VCU for 2 ton OR
BLUE STAR NON INVERTER AC 3HW18FBTV for 1.5 and 3HW24FBTV for 2 TON.
BOTH COST IS SIMILAR and both are 3star.
PLS SUGGEST OR SHOULD GO FOR ANY OTHER BRAND OR ANY OTHER MODEL.
Thank you in advance for your reply.
AKASH

82
Abhishek Jain (Mod)

Hi Akash,

Firstly you do not need a 1.5 ton AC for 10x11 room in chennai unless the walls as well as ceiling are exposed to direct sunlight throughout the day. A 1 ton AC would be more than enough. Similarly for the hall a 1.5 ton AC would be more than enough unless walls as well as ceiling are exposed to direct sunlight.

In terms of value for money I think LG BEE 3 star rated inverter ACs are best and even Bluestar BEE 3 star rated inverter ACs are good. I would not recommend BEE 3 star non inverter as they are least in terms of efficiency in the market. Better go for BEE 3 star inverter.

83

Hi Abhishek,
Thanks for having loads of useful information in this blog.
I am planning to buy 2 inverter ACs (preferably 5*) for 2 bedrooms in my apartment. Here are the details/specifications:
1. City - Bangalore
2. Floor no - 1st floor, there are many floors on top of it
3. 1st bedroom - L-14' x W-10.5' x H-9'6", 3 sides covered by internals walls. I think 1T AC is ok here.
4. 2nd bedroom - L-17' x W-14' x H-9'6" , 2 sides fully and 1 side partially form external side of apartment. i think 1.5T/1.8T AC will be ok here

Questions:
1. If price is no bar then which brand e.g. Daikin, Mitsubishi, Carrier, bluestar (let me know if you recommend any other brand) and model would you recommend based on
a. after sale service

Appreciate your response

-Ashish
b. better specs e.g. copper condenser, modes (dry, sleep, cool etc), auto restart, filters etc
c. noise level
d. durability/longevity
e. power efficiency

84
Abhishek Jain (Mod)

Hi Ashish,

Here is my response:

1) For room 1 you need 1 ton and for room 2 you need 1.8 ton AC. You can go for 1.5 ton for 2nd bedroom if your usage is mostly at night. During the day it may fall short a bit.

2) It is difficult for me to say about after sales service because it varies from location to location for a brand. Some brands are strong in some areas and some are not. You will have to get local information for the same.

3) The brands that you have selected are all premium brands. Daikin and Carrier will have all copper models. Mitsubishi and Blue Star would have some copper and some aluminium models. In Mitsubishi, there are two brands: Mitsubishi Electric and Mitsubishi Heavy. Electric has both copper and aluminium whereas Heavy has only copper. Mitsubishi Heavy is a more heavy duty kind of brand and their ACs cover larger area in general. It will not be possible for me to pick a brand out of these because all are good brands. However, in terms on energy efficiency you will find Daikin, Mitsubishi Heavy and Mitsubishi Electric among the top. Bluestar would also not be too bad. Bluestar is a premium Indian brand and has good value for money models (prices are not exorbitant). But Mitsubishi would be really expensive and Daikin would also be expensive. Mitsubishis are imported, while Daikin is now assembled in India.

4) In terms of features I think Daikin top end and Blue Star top end models have really good air filters. Dry mode, sleep mode, etc are there in almost all ACs. Daikin JTKM series or Bluestar PAFU series have really good efficiency, copper condenser and great filters.

5) Daikin and Mitsubishi will be best on noise levels. Others are also not too bad.

6) All these brands are good on durability/longevity. But Mitsubishi Heavy would be the most robust in that.

All in all if you are really ready to spend that much and you can ignore a lot of air filters, then Mitsubishi Heavy would be great (in case they have good service in your area). But they are super expensive.

85

Hi dear, I need to install AC in my shop 21×10.5×12 ft. on Ground floor, roof open to sun, having not any other floor above and no windows, only main glass door 10×12 ft, with 10 persons in shop, in Amritsar, Punjab. Kindly suggest best inverter AC with R290 or R600 refrigerant with budget upto 50k. Kindly also tell the accurate tonnage.

86
Abhishek Jain (Mod)

Difficult to tell accurate tonnage but I guess you would need at least about 3.5 tons of cooling. There are no AC models with R-600 as it is not a refrigerant suited for ACs. Godrej is the only brand that sells models with R-290. You will need two ACs for the shop and I doubt you can get two inverter ACs in a budget of 50K.

87

Hi dear
1. Would a single inverter AC of 2 ton be adustable for such room size?
2. If I ignore R290 and R600, can you please suggest me best inverter AC of copper coil available in market under 50k?

88
Abhishek Jain (Mod)

It will be difficult to get a 2 ton inverter AC in under 50K. Also if you undersize an inverter AC, you will not get benefits of energy saving. It will be better if you go for 2 ton fixed speed AC of BEE 5 star rating. 2 ton inverter AC will not be adjustable to such room size.

89

Thanks dear.
1. Pls suggest 2 ton 5 star AC. No price bar.
2. As u said earlier that only godrej is manufacturing R290 ACs and also I'm environmentalist, would godrej 2 ton AC with R290 be better and efficient? Can u review it?

90
Abhishek Jain (Mod)

Godrej is the only brand than makes R-290 ACs and they only make 1 and 1.5 ton ACs. They do not have 2 ton ACs. Here is the link to Godrej Catalog: http://www.godrejappliances.com/godrej/GodrejAppliances/Category.aspx?catid=92&subcatid=122&subsubcatid=780

I think you can look at any of these 2 ton 5 star ACs:

BrandModelAmazon LinkFlipkart Link
MITSUBISHISRK20CSS-S6/Ahttp://amzn.to/2tm97i6" rel="nofollow" target="_blank">http://amzn.to/2tm97i6 
HITACHIRAU520MWD  
MITSUBISHISRK20CSS-S6http://amzn.to/2tm97i6" rel="nofollow" target="_blank">http://amzn.to/2tm97i6 
MITSUBISHISRK25CSS-S6  
HITACHIRAU524AVDhttp://amzn.to/2vL7754 
HITACHIRAU524IVDhttp://amzn.to/2vFCKhI 
HITACHIRAU524MWD  
CARRIEROctra-X 5 Star 2 Ton  
CARRIERSuperia-X 5 Star 2 Ton  
PANASONICSC24SKY5 

And of these I think Mitsubishi Heavy (1st, 4th and 5th) would be the best as Mitsubishi Heavy has longer air flow and thus it covers a larger area in general. Efficiency wise also they are the best.

91

Thanks dear for your kind suggestions. I'm planning to go for MITSUBISHI SRK20CSS-S6/A which is 1.62 ton 5 star AC of Eco-Smart Hybrid technology.
1. Eco-Smart Hybrid technology mean conventional Non-Inverter type or better than it?
2. My local dealer is pricing 50K for MITSUBISHI SRK20CSS-S6/A. Is it good price according to you?
3. There is a also a Hyper inverter technology in mitsubishi which I think mean inverter AC.
As inverter AC is better than Non inverter, should I go for Hybrid technology or hyper inverter technology mitsubishi AC as per my requirement mentioned above? Kindly suggest.

92
Abhishek Jain (Mod)

Here is my response:

1) Eco Smart Hybrid is better than conventional non inverter type. It has sensors that regulate the flow of refrigerant depending on the requirement. It is not exactly inverter technology but somewhere between inverter and non inverter, but certainly better than non inverter.

2) 50K sounds reasonable for the AC.

3) Hyper inverter technology would be much better but then it will also cost you a lot more. Hyper inverter will be lot more energy efficient. And as per specs covers a slightly larger area. So it will certainly be better. But then you will have to increase your budget in that case.

93

Hi dear, what is the best stabilizer to buy for MITSUBISHI SRK20CSS-S6/A 1.62 ton AC you suggested me? Is it mandatory to buy stabilizer only from the dealer of AC or can I buy from anywhere?

94
Abhishek Jain (Mod)

Choice of stabilizer depends on how low the voltage goes in your area. I cannot recommend one without knowing that value. You can check this page on our website: https://www.bijlibachao.com/appliances/voltage-stabilizers-buying-guide-best-tv-ac-fridge-home-guide-india.html

You can buy it from anywhere as long as you know how low the voltage goes. If you are not aware then better take it from dealer as he may know based on his experience with several customers in your area.

95

Normally there is no problem in voltage fluctuation in our area

96
Abhishek Jain (Mod)

In that case a basic V-Guard VG 500 (Amazon Link: https://amzn.to/2jm4EG4 , Flipkart Link: http://fkrt.it/ouU5yTuuuN ) should be good enough.

97

Dear, there are 4 no. of 12W LED bulbs, 2 fans of 75W, 1 inverter of 600VA and 1 battery of 150ah, and would be 1 AC of 1.62 ton. How much capacity of stabilizer is needed? Is it possible to fix the same stabilizer on main line instead of AC as per my requirement?

98
Abhishek Jain (Mod)

If you do not have much voltage fluctuations then I would not suggest you to go for mainline stabilizer. A mainline stabilizer has to remain "on" all the time when the appliances are used. A stabilizer also has electricity consumption and it will add 2-3% extra on your electricity bill. If you use it only for AC then it will be "on" only when AC is "on". Otherwise you should keep it off. But if you keep one at mainline, you will always have to keep it "on".

99

Please recommend a good Copper Coil AC

100
Abhishek Jain (Mod)

Hitachi, Daikin , Carrier, Mitsubishi Heavy all have only copper condenser models.

101

Hello. I wanted to thank you for all the valuable information here. I wanted to write to you that this month, the energy usage in my home (2 BHK flat in Mumbai) reached an all time low of Rs. 1600 (with 3 hours daily AC usage). It all began when I first questioned the electricity bill after returning from abroad. I googled something like "Energy efficient appliances" and your website had come up. I found gorilla fan from you. I then started changing every thing, and now, I have accomplished my ultimate goal. Bills reduced from 3500-4000 without AC use to 1600 WITH Ac use. Thank you for all I could find from your site. You have been a huge help. The bills here will go below 1000 when AC and Computer use will be cut down (currently it is heavy).

102
Abhishek Jain (Mod)

Hi Ravi,

I am super glad to see your message. You made my day. Whenever someone replies that they have been able to reduce their electricity bills with help of the information on this website, we feel that we have made a dent in the universe :) .... the objective that we have is to save electricity and every such message makes us feel that we have taken a step forward. Thanks a lot for this message and I am really happy that you were able to reduce your electricity bills .... one more step towards a cleaner environment and better energy access to everyone in the country! and we have a long way to go :).

103

Hi Abhishek, I wanted to let you know that this month's bill is also out for my home, and it is EVEN lower than previous month despite MORE use. Now the bill is Rs. 1400, and it is further reduced now due to the fact that this was the first full month of the new refrigerator. Also, this amount is with 4 ceiling fans being used (2 of them Gorilla fans, 1 Havells ES-40), Inverter LG ac (3 star) being used 2-3 hours every night, Washing machine use every day, water purifier, water heater was also used in the mornings. In a 2 BHK flat in Mumbai.

104
Abhishek Jain (Mod)

Hi Ravi,

That's great news! However, in general electricity bills are lower in cooler months as due to low temperature difference Refrigerators and ACs consume less. Also ceiling fans are used at lower speeds.

105

Yes, that's a factor too. So I guess in December-January, the bills will be even lower. Great. Thank you. also, I had one confusion regarding how water heaters work. I have a Crompton 3 liter one that is 3000-watt. Does it mean once I turn the switch on, it will constantly take 3000-watts of energy? How does its consumption work? Because I am calculating it to be constant. What if someone only uses it for 20 minutes?

Author106

Hi Ravi,

Calculation for water heater is very simple. Specific heat of water is 4.2 joules per gram per degree celcius. Which means with 4.2 joules of energy 1 gm water can be heated by 1 degree. So 3 lts or 3000 gm will need 3000 x 4.2 = 12600 joules of energy to raise 1 degree. Now the temperature of water that comes to your house will be around 20-25 in Mumbai. Also every water heater has a thermostat which switches off the water heater when it reaches a certain temperature. Let us assume thermostat is set to 70. Then you need to raise temperature by 50 degrees. So 3 lts water would need 12600 x 50 = 630000 Joules of energy.

Now Watt is rate of energy generated. So 1 Watt = 1 joule/sec. And 3000 Watt = 3000 joules per sec. So it will generate 630000 joules in 630000/3000 = 210 seconds. So after 210 seconds, the thermostat will switch off the heater (unless you have taken out some hot water and it is replenished with cold water in the heater).

Another factor would be the standing loss. The container that contains the hot water will become hot in contact with the hot water, and it will start leaking heat out. A lot will depend on how good the insulation is. But still it will loose some heat. And some joules/sec will be lost and will be needed from the heater.

So all in all, electricity consumption of water heater depends on:

1) Volume of water that you use. The lesser hot water you use or lesser the temperature at which you use it, lesser will be the electricity consumption.
2) Standing loss of the heater. Try not to leave hot water in the water heater and make use of all of the hot water as quickly as possible, because if it remains in the heater, it will loose heat or electricity.

107

Oh, great, that's a very in-depth explanation. Helps my understanding quite a bit. Thank you very much, sorry for the late response, was out of city.

108

Thank you very much. It was a learning period for me too. Your site made it very easy to do a lot of things. And if everyone could take energy saving measures, it would be great. I will keep reporting further decrease, because as I said in the other comment I made, the 11 days of this cycle were with old refrigerator so I expect it to go down even more. All this, despite heavy use and no cutdown of anything, fans or AC or anything. This is really such a great thing. I am excited for what the future holds for all of us in terms of energy efficiency too.

109

I should add to this some things about my case. That Rs. 1600 is actually with 15 days of a 10 year old refrigerator. So next month, the bills will go down even more, since I changed to Haier 1954BS-R (151 annual units). And in one of my rooms, fan is on 24 hours, with 16 hours of computer on-time and use. Since I work in and have always been interested in I.T, I changed from an inefficient old AMD processor (phenom II x4 - 120W/hour) to a sixth-gen Intel Skylake CPU (51Watt/hour). I will update you next month too as I see more improvements.

110

Hi Abhishek
This website provides guidance and proper information about various types of ACs and things needs to be taken care while going for new AC purchase and installation.
Keep guiding and helping novices like us!!!

111
Abhishek Jain (Mod)

Thank! I am glad that you found the information useful.

112

hai,
I would like to buy an AC for my parent's room 166sq ft, the ceiling of the room isn't flat and it's single floor.
would like to know what would be ideal either inverter ac or non-inverter ac. Usage would be 3 to 4 months mostly ( as they are non-resident).
and how good is inverter ac in terms of its board, heard of failures and heavy cost on repairs

113
Abhishek Jain (Mod)

Which city are you from? The size of the AC will depend on the city and also choice of inverter/non inverter will depend on the tariff of electricity in your city and your usage. I would suggest that you use the calculator on this page to get the right size. The calculator will also suggest you running costs of various star rated ACs (inverter & non inverter), based on that you can decide which one you want to go for. Let me know the size that the calculator suggest, your preferred star rating and your budget for the AC and I can recommend you some models.

114

from calicut

115
Abhishek Jain (Mod)

Can you please try using the calculator on this page?

116

Hello Sir,
I am living in Chennai City, My new flat having 3 bed room, and its 5 floor, above me 2more flat.I want to buy split a/c with invert model. the room size
1.master bed room 12X11 feet, and east side one window.
2.child bed room 10X11 feet and north side one window.
3.child bed room 11X11 feet and north and east side window.
and my usages daily 8 to 10 hours. about 6 month a year. please recommend best brand and capacity, my budget is Rs.40k each. thanking you.

117
Abhishek Jain (Mod)

Hi Gautam,

I think BEE 3 star rated 1 ton inverter AC would be great for all your rooms. You can look at any of these:

BrandModelAmazon LinkFlipkart Link
BLUESTAR3CNHW12TAFU  
GODREJGSC 12 MINV 3 RWPM http://fkrt.it/prToGTuuuN
BLUESTAR3CNHW12CAFUhttp://amzn.to/2wppEDO 
LGJS-Q12NUXA  
DAIKINFTKH35 http://fkrt.it/3HbGd!NNNN
BLUESTAR3CNHW12NAFU  
PANASONICUS12SKYhttp://amzn.to/2wCUNmi
118

Sir, 4 months back i have purchased Blue star 3HNHW17RBFU Model. Can you please tell me about this ac. in month of may 4-5 hours usage of afternoon it consumes 3-4 units, 8 to 9 hours at night on 24 or 25 degrees it consumes 4-5 units. may month electricity bill is Rs.1300. from june Usage 8 to 9 hours at only night it consumes 3-4 units. Out side temperature is low it consumes 2-3 units. monthly electricity bill is Rs.508. now a days ac runs its starts giving little smell. how can i sort out this issue.

119
Abhishek Jain (Mod)

Smell comes when the AC is not able to remove humidity effectively. This could be because the compressor is not running long enough to remove humidity. You may have to decrease the temperature setting on the AC to remove the smell. However, that will also increase electricity consumption. How big is the room and in which city are you located?

120

Sir,I am planning to buy Daikin JTKM 50 Inverter AC.I live in Lucknow so saline air or voltage surge is not at all a problem.
But,recently I read about many Daikin inverter AC PCB's being blown up due to ants,mice and lizards and the consequences were hefty costs of repair of upto 15000.
So,should i go with Daikin JTKM 50 inverter model?
IF NOT,PLEASE MENTION THE BEST IN CLASS ALTERNATIVES UNDER BOTH INVERTER AND NON INVERTER CATEGORIES.

A quick revert would be highly appreciated.

121
Abhishek Jain (Mod)

Hi Akarshan,

PCBs of inverter ACs are expensive to replace. If they fail (whatever be the reason), you will have to pay a lot. Now it does not happen often that ants, mice, lizards get inside an AC's outdoor unit. But if it does, then it can cause problem in any AC. JTKM50 is a great AC otherwise.

122

First of all thank you for answering.

Just 1 doubt remains-

Could you please state certain measures to prevent such creatures from entering the outdoor unit.(Like I read it somewhere that one can apply Vicks vaporub on the inside of the outdoor unit to prevent them. IS IT SAFE AND WILL IT WORK?)

123
Abhishek Jain (Mod)

Hi Akarshan,

The outdoor unit is a box that contains condenser (heat exchanger) and compressor. As long as you do not put something that blocks the working of these units, it should be fine. So do not apply something directly to these two. Else you can certainly apply any rodent protection gel, etc.

124

1) Can a lake in the vicinity of 0.5 km be a potent cause for PCB corrosion?

2) Please suggest the best stabilizer for Daikin JTKM50 (1.5 TON)
HAVING THERMAL OVERLOAD/SURGE PROTECTION FEATURE
to protect the PCB from getting damaged by VOLTAGE SURGE.

125
Abhishek Jain (Mod)

Hi Akarshan,

1) It may or may not affect. I have a lake close to my house which is less than 0.5 km. But nothing has happened to my AC in past 4 years. I have known people in my vicinity who have had inverter ACs for more than that as well. I cannot confirm if it can damage the PCB.

2) The choice of stabilizer depends on how low the voltage goes in your area. I can suggest you one, but then if voltage goes lower than its acceptable range then it will not be effective. So first you need to find how low the voltage goes in your area and then choose one accordingly. You can check this page: https://www.bijlibachao.com/appliances/voltage-stabilizers-buying-guide-best-tv-ac-fridge-home-guide-india.html

126

I prefer having a stabilizer with an inverter ac solely for the purpose of preventing voltage surge from damaging the PCB and not for actually regulating fluctuations since my area doesn't have any.

So could u please recommend a stabilizer for 1.5 ton inverter ac without considering the working range of the stabilizer since that range has no significance in my case.

127
Abhishek Jain (Mod)

You can go for VGuard VND 400 (Amazon Link: https://amzn.to/2ksOf4M )

128

Thank you very much for sparing your precious time for me and being so precise with your answers.

I must say that your website is a must visit for layman wanting to buy an ac.

Kudos to you and your team!!

129
Abhishek Jain (Mod)

Hi Akarshan,

Thanks for the good words. I am glad that you found the information useful.

130

My requirements-BEST IN CLASS PERFORMANCE(1.5 TON) with highest efficiency.

131
Abhishek Jain (Mod)

You can check Daikin JTKM50, Hitachi Kashikoi 5400i or Bluestar 5CNHW18PAFU.

132

Sir, we are planning on buying an AC and are confused between a 3 star and a 4 star Dual inverter AC's from LG.
The price between them differs by 10000 rupees. I was wondering in the long run if the electricity savings from a 4 star Ac would be more than the difference in the cost price. Please suggest. The room size is around 150 sq.ft will be using it for 5,6 months in a year around 6-7 hours per day.

133
Abhishek Jain (Mod)

Hi Aniketh,

For your usage 3 star inverter AC would be good enough.

134

Hi Sir,
i want to buy an inverter ac for my bedroom area 150sqr Ft so please suggest to me best ac.

135
Abhishek Jain (Mod)

Hi Rahul,

At Bijli Bachao, we suggest this strategy: First find out the right tonnage that you need for you room, because undersized AC may not cool well, and in case of non inverter AC, oversized AC can significantly increase electricity bills. In inverter ACs, slight oversizing is fine. You can use the calculator on this page to get the right tonnage: http://bijlibachao.com/top-ten-appliances/best-air-conditioner-ac-window-split-hitachi-lg-carrier-samsung-electricity-consumption-tonnage-in-india.html

Right tonnage depends on city, room’s location (if it gets direct sunlight on walls/ceiling or not), size of the room and number of people in the room, etc. Usually we assume 4 people in a room to do some calculations. But other parameters are required to be known to calculate the right size. A city like mumbai needs less cooling because temperatures do not go too high. But a city like Delhi needs more cooling because it is too hot in summers. Similarly a room on top floor getting direct sunlight on the roof will need more cooling as compared to a room on lower floors. So I would suggest that you use the calculator on this page to calculate the right tonnage.

After finding the right tonnage, you have to look at your usage of AC in hrs/year. And your budget. Because your usage determines if you need high efficiency AC or not (inverter or non inverter). Secondly we try to suggest the most efficient AC based on a person's requirement (tonnage requirement) and the budget.

Let me know the right tonnage (as per the calculator) and your budget and I can suggest you some models accordingly.

136

My house is at West Bengal.The temperature of the heating is 35c to 42c. My room size is also 10x12 sq. It's at the top floor. So tell me how much size will I get in the AC.

137
Abhishek Jain (Mod)

Hi,

I would suggest that you use the calculator on this page to calculate the right size. It will provide you all the answers.

138

Also please tell can i run following Inverter Ac at my 1500VA modified size wave inverter?

http://ecostar.com.pk/products/gree-products/gree-air-conditioners/inverter-series/g10-inverters/GS-18VITH1

Thanks in advance.

139
Abhishek Jain (Mod)

It's highest power input is 2300 Watts. So better go for 2.5 or 3 kVA inverter. 1.5 kVA will be less.

140

Thanks a lot bro for your kind prompt response.

141

I am very thankful to you for providing such valuable information. All your articles are well described and almost every bit of info is covered. Greetings and love from Pakistan.

142
Abhishek Jain (Mod)

Hi Umair,

I am glad that you found the information useful. Thanks for the good words.

143

Hello sir......I am planning to buy a 2 ton AC for my bedroom (approx 220 Sq. mt). In summer, my city (Jaipur) temperature goes upto 46-48 day & 35-38 night. Usage 8 to 9 hours at only night. so should I go for Inverter AC or Non-Inverter AC. Please suggest any brand.

144
Abhishek Jain (Mod)

Hi Sachin,

Is the room 220 Sq mt or 220 Sq ft? Because 220 Sq mt is huge! If you plan to use it only at night then 2 ton inverter AC would be good. You can look at these ACs:

Hitachi RMB324IAEA
Blue Star 3CNHW24TAFU

145

it's 220 Sq.FT....what about 2 ton LG dual inverter AC.... please guide about electricity consumption in LG dual inverter AC and 3 star non inverter AC. Usage 8 to 9 hours at only night. My local dealer tell me that there is no requirement of stabilizer for dual inverter AC..... is it right???

146
Abhishek Jain (Mod)

Hi Sachin,

LG 2 ton inverter ACs are not really 2 ton. They are 1.7 or 1.8 ton AC. In fact most brands mark 1.7/1.8 ton as 2 ton. Your room size is big and that is why I suggested true 2 ton ACs (so that just in case you use in day time it will work well). If your usage is only at night then you can go for LG Dual Inverter AC as well. And yes they do not need a stabilizer. In fact most inverter ACs do not need a stabilizer, but models from LG and Samsung have great voltage protection features.

147

Hi Moderator / Abhishek Jain, First, a big Kudos for your patience and detailed, at times repeated questions' responses. Hats off to your interest to address people's all questions. My question is, I got a Hitachi RSD318EAEA recently. Wondering about the inbuilt stabilizer. Does it have the capability to find out if the power outage and resumption happened just a few min back only? Like stabilizers having the delayed start (2-3minutes) so the AC compressor is not strained in case of power resumption within 2-3 minutes of outage while AC was running, cooling. Thanks in advance.

148
Abhishek Jain (Mod)

Hi Jayakumar,

Most modern ACs have inbuilt time delay to handle power outages and other situations. So yes, it would have a time delay.

149

maintaing cost of inverter is high compare to normal 5 star ac?

150
Abhishek Jain (Mod)

Yes it would be.

151

hello sir,
Can you explain me the cost of ownership between normal air conditionar vs inverter air conditionar.
so on which the cost of maintaining is high. Either i go for copper condenser or aluminium/Alloy.

152
Abhishek Jain (Mod)

Hi Aman,

I would suggest that you use the calculator on this page to understand the cost of ownership of different star rated air conditioners.

For copper and aluminium, let me copy some text that I use to reply most people having confusion about copper and aluminium:

***********************
There are two type of condensers: PFC and copper condenser. We have explained PFC and copper condenser in detail on FAQ no 13 on this page: .

You can get more details like pictures on that page. Here is the text from it:

a) PFC (Parallel Flow Condenser) or Multi Jet which is all aluminium. It is highly energy efficient (more than tube and fin condenser) but if it fails it need to be replaced. It can get damaged due to corrosion and thus needs good corrosion protection. Manufacturers specifically mention PFC or Multi Jet.PFC is a good technology from energy efficiency and costs point of view. And both copper and PFC will fail in case the environment is corrosive. It is just that copper ones can be repaired while PFC needs replacement. And because there is hassle and expense related to replacement (which only happens in case of corrosive environment), Aluminium has got some bad press. But it is not that aluminium fails always.

b) Coil and Fin type condenser, where coils are copper and fins are aluminium. Even in this the one with anti corrosion coating (also known as blue fin/gold fin) is better. Most brands have such type of condenser. You can ask the dealer to open the outdoor and indoor unit for you and you can check if it looks blue or not.

Please NOTE: Both copper and aluminium can corrode and in fact the coil and fin having two metals can corrode faster. The most important thing to look for is corrosion protection and not just copper or aluminium.

Also all depends on level of corrosion. If you live close to sea then corrosion is faster. I have personally used Aluminium ACs in Powai, Mumbai (about 6-7 kms away from sea) and never faced any corrosion issue. But people living on say worli seaface, Mumbai (right on the shore) always have direct winds from sea which can cause corrosion.

****************************

153

Hello, this article is very informative still I would like to seek your guidance in buying an inverter AC. As you know sales are on peak due to upcoming GST norms & I'm positively looking to grab a quick deal in the process. My requirements are as follows-
Location- Mahim, Mumbai (far from Mahim bay)
Usage-
Summer- 16-18 hours/day from Feb-May and probably in Oct depending on heat
Rainy- 6-8 hours/day from June-Sept/Oct.
Winter- 4-5 hours/day from Nov- Jan

The above usage has been calculated from experiences so far using 5 star window AC which definitely has put a big hole in pocket so far.

Tonnage- 1
Inverter- Yes
Brand- Any
Budget- <33k

Can you recommend a model from following page on amazon-
http://amzn.to/2s3eUbw

Also, planning a visit to VS, Croma & Kohinoor in hope of cracking good deal.

Thanks for reading.

154
Abhishek Jain (Mod)

Hi Nimish,

Considering Mumbai electricity tariffs (which are really high), your usage of AC is quite high and it will be better if you go for a BEE 5 star rated inverter AC of 1 ton. I think Blue Star 5CNHW12PAFU (Amazon Link: http://amzn.to/2spb3oB ) is a great choice and quite well priced. But then you will have to increase your budget by 5K. But it will be really worth because your usage is high. Otherwise the best brand in your budget to get a BEE 3 star rated inverter AC would be LG. You can get models with decent energy efficiency at budget price. But then your usage is high so I would suggest going for a more efficient model.

155

Hello, I am SHAMEER from Chennai planning to buy an split ac for a room size of 130sq.ft in ground floor(G+1) and having windows facing west and east, should I go for 1.5ton or 1ton. Or Hitachi 1.2 Ton 5 Star ZUNOH 5200f -RAU514AWD is enough. Please tell me some models from carrier and blue star if I should go for 1.5ton

156
Abhishek Jain (Mod)

1.2 ton is enough for your room. You can go with Hitachi 1.2 Ton 5 Star ZUNOH 5200f -RAU514AWD.

157

thank you, will there be any issue relating to spares parts availability in future due to 1.2 ton

158
Abhishek Jain (Mod)

No. There should be no issue in buying a 1.2 ton AC.

159

Hello sir I bought yesterday an LG 3 star inverter ac (JS-Q12BPXA) and I live in Andheri Mumbai. Do I need a stabiliser for this particular AC? The AC page says It can operate without stabiliser in range of 145-290V. If fluctuations are beyond that, then we'll need a stabiliser. So would I need one for this?

160
Abhishek Jain (Mod)

There is no power fluctuation in Mumbai. You do not need a stabilizer for this AC.

161

Hello, I am Viplav from Chandrapur(Maharashtra) about 150Kms form Nagpur. I am planning to buy Split AC for my Bedroom of 15*10 ft, no direct sun light from Top & on Walls. In summer, my city temperature goes upto 48-49 day & 32-35 night. so should I go for Inverter AC or Non-Inverter AC. And I have heard that after certain external temperature Invertor AC stops or it wont cool properly. Is it true??
Daikin, Blue Star, Panasonic or Godrej what should I prefer...

162
Abhishek Jain (Mod)

You need a 1.5 ton AC for your room. Inverter AC should not stop at any external temperature as long as the temperature is withing its operating temperature range. Certain ACs have low operating temperature of 46-48 degrees and some have high (as high as 52). And this is the case with both inverter and non inverter AC. What is your budget for this AC?

163

Good if it is less.. but I can manage upto 45k-50k.

164
Abhishek Jain (Mod)

You can look at these models:

Panasonic PS18SKY
Blue Star 3CNHW18TAFU

These would be really good.

165
Gaurav Chaturvedi

Hi Abhishek
I live in Mumbai and am looking for 2 units of 1.5T AC for my flat. I had selected Daikin JTKM50 and placed the order with their dealer about 20 days back. However the dealer informs me that due to high consumption and low production of this model he will not be able to deliver same. That puts me on the hunt for AC again. My budget is INR50,000 per unit including installation. Can you advise the difference between JTKM50 and FTKM50 models of Daikin. Which other models would you suggest in this budget.

Thanks and brgds
Gaurav

166
Abhishek Jain (Mod)

Hi Gaurav,

FTKM50 would be the next best model from Daikin after JTKM50. The difference is that JTKM50 has air purifier built in and it is also a bit more energy efficient. But then Daikin FTKM50 is not bad at all. You can also look at Blue Star 5CNHW18PAFU (Amazon Link: http://amzn.to/2sLEJQk ) ... it is quite energy efficient, had good air filters and in general a good and value for money option.

167

HI,

I have recently bought LG 18NUXA 1.5 ton inverter ac. I thought it will be more energy efficient. However I see it consumes 1840 Watts of power and has running amps of 8.4. When I compare it with other ACs even if non-invertor, I see the power consumption is around 1650 watts and running amp is 7.1 to 7.9. Does this mean LG 18NUXA will consume more power and is less energy efficient? I am satisfied with AC's performance though.

Thanks,
CM

168
Abhishek Jain (Mod)

1840 watts is peak power consumption. The power consumption will vary based on the heat load. I would suggest that you read about the working of inverter AC above and then evaluate.

169

HELLO SIR,
we bought lg 1ton inverter 3star ac and we are installed in 100 sq.ft room.we are new user of airconditioners so we decided to go with inverter series due to low energy consumption but after using for 2 months we get 3500 additional charges with my usual eb bill, SO MY QUESTION IS WHERE IS THE ENERGY EFFICIENCY IN THESE? and WHY I PAID EXTRA 20k for the inverter series,what benefit from the inverter ac, NOTHING RIGHT?

170
Abhishek Jain (Mod)

Hi Abishek,

Let's take an example to help you understand your situation. Imagine you are used to driving a two wheeler that gives a mileage of 75 km/lt and then you decide to buy a car. Now you buy a good fuel efficient car that gives a mileage of 18 km/lt. But when you use it, you feel that you have spent a lot of petrol. Now the big difference here is that cars do consume much more fuel as compared to a two wheeler. The moment you add an AC, your electricity bills are bound to increase. You cannot add an AC and expect that bills will not increase much.

Adding another dimension to the above analogy is the usage. If your usage of car is high, even the most fuel efficient car will consume petrol. Similarly, even if you get most energy efficient AC, it will consume some electricity to run. Your electricity bill increased by about 1750 per month. Now I am not sure which city you are in and what is your tariff. But on an average if I assume Rs 7 per unit, the consumption in a month is 1750/7 = 250 units. Which is roughly 8 units a day. 8 units a day sounds reasonable for 1 to 3 star inverter AC if your usage is about 14-16 hrs.

171

waiting for ur valuable reply sir

172

Hi Bijli Bachao team,

Thanks for all your excellent efforts here. Early this year I bought an inverter AC on your reccomendation and I am quite happy about it. I bought Daikin FTKM50 5-star inverter.
Now I need one more AC for my living room. I live in Noida in a high rise, where summers are dry and corrosion is not an issue. Also power cuts are minimal. The tonnage calculator is giving me a size of 3.0 tons for my living room, but I do not see any residential AC of that size. The closest I see is Daikin FTKP71 2.2 tons 4 star inverter for a price of 65K including installation. My question is:
1. Is Daikin a trusted brand, and should I go for it again. Although my Daikin AC is working fine but its only been a couple of months since I am actually using it.
2. What are others options in this tonnage?
3. Can I go for 2 tons, where I get more options, as for living room we need it to be comfortable and not cold like bedroom.

Please suggest a suitable AC . I am assuming that Inverter tech would be best, please advise if you think otherwise.

Thanks a lot.

173
Abhishek Jain (Mod)

Hi Saurabh,

Here is my response:

1) Daikin is a premium brand and certainly a trusted one. Rest all depends on your choice. You may try other brand as well.

2) I would not suggest you to undersize an inverter AC as it will not give desired electricity saving benefits. Also if your usage of AC is not high then you may not need an inverter AC.

3) If your room needs 3 ton and if you install a 2 ton AC, then it will not cool the whole room. The corners of the room which are farthest from the indoor unit will not receive enough cooling. So it will be better if you install it close to the seating area. You can go for a 2 ton AC with an understanding that it will not cool the whole room. And yes, its electricity consumption will be on a higher side because the compressor will hardly get time to rest (it will have long cycles). The best thing that you can do is to go for an AC with 2 ton capacity, BEE 5 star rating (for less electricity consumption), non inverter and with long air flow. Models from Mitusbishi (Mostly mitsubishi heavy and a few mitsubishi electric) have long air flow to cover a larger area. But then MItsubishi models are also super expensive. You may optionally go for any 2 ton AC which is BEE 5 star rated non inverter (in case cost is an issue).

174

I am from Rajkot city (Gujarat), planning to buy split ac of O General or Mitsubishi Electric for my living room having 260 carpet area and 10 Ft. height, no direct sunlight from top and on walls. Usage will be for daily 5 hours for 5 months. Kindly suggest which brand should i choose, as well as suitable Ton, Star rating, inverter or without inverter split ac should i go for ?

175
Abhishek Jain (Mod)

Sorry. Not that O General model. You can look at Mitsubishi Electric MS-GK or MS-GL series.

176
Abhishek Jain (Mod)

Hi Akash,

Both Mitsubishi electric and O General are good. Your usage is not very high, so you can go for non inverter Split AC. I think Mitsubishi Electric will have more energy efficient options, however, O General is quite sturdy. You can go for 2 ton model from O General ASGA24FUTA

177

Dear Mr.Jain
We r thankful to you about your awareness programme and saving electricity and environment.
I want to buy 1 ton inverter ac.i live on 2nd floor and A drian is 600 mtr away from my home.my budget under 30k.i have shortlisted sansui Hyundai, mitashi whirlpool inverter ACS.if you can suggest me top 3 model according to my requirement.
Thanks in advance.

178
Abhishek Jain (Mod)

Hi Neeraj,

If there is a drain then I would suggest that first you check with your neighbors who own ACs to find if there is regular leakage of gas or not. If there is regular leakage then the environment would be corrosive and I would not suggest you to go for inverter AC. If there is no regular leakage then you may go for a 1 ton inverter AC. Just check with people and let me know and I can suggest something accordingly.

179

I found Lg services r good here and blue star is also good.pls suggest any model of lg with 5 star ac

180
Abhishek Jain (Mod)

I would suggest that you go for Bluestar as they have good corrosion protection. You can look at these models from Bluestar: 5HW12SBTU , 5HW12ZBRTU , 5HW12ZBWTU

181

Hello,
I am planning to buy an Air conditioner for my parents. The room size is 110 sq feet with height 10 ft situated in top floor with two window facing west and south each. My local ac dealer suggest me to go for 1 ton 3 star ac. But based on my research some said 1.5 ton would be good rest suggested for 1 ton. Could you please help me with this?
Mostly ac would be used for 8 hours/day during sleep hours.
Suggest me if I can go for 1 ton inverter ac as in some website it says 1 ton inverter can work for upto 1.2 ton capacity till cooling or If i should go for 1 ton or 1.5 ton non inverter ac.
Due to my budget constrain I have looked up below models.
http://www.onida.com/air-conditioners/GUSTO%20-%20INV12GSO -- 29K in my local dealer
http://www.onida.com/air-conditioners/GUSTO%20-%20SA123GSO -- 25K in my local dealer
Above models are 100% copper and has R410a gas
Could you please go through the above model and let me know whether i can go for above models or any other suggestion.
Thanks!!

182
Abhishek Jain (Mod)

Hello,

Which city are you in? The size of AC will depend a lot on that. I would suggest that you use the calculator on this page to calculate the right size as the calculator takes in a lot of parameters that are required to calculate the right size. Inverter ACs can extend to up to 0.2 ton more than the marketed size. Let me know the size as per the calculator and your budget and I can suggest you some models.

183

Hello Abhishek,
As per the calculator the right size suggested by it is 1.5 Ton (For cooling requirement of 1.2 Ton) and My budget is around 28- 32K.
Thanks

184
Abhishek Jain (Mod)

In that case you can even go for 1 ton inverter AC, because 1 ton inverter ACs can extend to 1.2 to if needed. If you need popular brands then you can look at these:

Whirlpool 1 ton Fantasia inverter AC (Flipkart Link: http://fkrt.it/2lU0q!NNNN )
LG JS-Q12BTXD (Flipkart Link: http://fkrt.it/2lqLO!NNNN )
LG JS-Q12BPXA (Flipkart Link: http://fkrt.it/2zM9g!NNNN )

If you are fine with lesser known brands then you can look at these:

Onida INV12IRS (Flipkart Link: http://fkrt.it/2zykg!NNNN )
Sansui SS4C34.WS1-CM (Flipkart Link: http://fkrt.it/2HKJX!NNNN )
Hyundai HS4I54.GCO-CM (Flipkart Link: http://fkrt.it/Lr0R4TuuuN )
Mitashi MiSAC10INv20 (Flipkart Link: http://fkrt.it/2Hluj!NNNN )

185

I have a Carrier 1.5 ton (Ester) AC - I had temporarily shifted to a residence and will be here till 3 months. Since its a temporary shifting, I had not installed the AC here (it was uninstalled from the old location). Can it lay still for 3 months or will this cause any problems to the electrical components of the AC

186
Abhishek Jain (Mod)

Depends on how it is kept. If the environment (where it is kept) is not corrosive, then there should be no problem.

187

Hi
Which one will be better?

1. LG-JS-Q18NUXA
2. Daikin-FTKH50SRV
3. Hitachi-RSD318EAEA

188
Abhishek Jain (Mod)

Hitachi-RSD318EAEA

189

Hi,
Please suggest from below models
1. LG-JS-Q18NUXA
2. Daikin-FTKH50SRV
3. Hitachi-RSD318EAEA

190
Abhishek Jain (Mod)

Hitachi-RSD318EAEA would be the most efficient.

191

Hi Abhishek
Thanks for your reply. I have to add another ac in that list. Bluestar RBFU series BI-3HNHW17RBFU/
BO-3HNHW17RBFU .Can you please tell me about this ac.

192
Abhishek Jain (Mod)

Hi Avik,

Purely from efficiency point of view Hitachi has the most efficient BEE 3 star rated ACs. Bluestar is also a really good brand. Among the models that you have selected, Daikin FTKH is the only one with really low efficiency (among all). But otherwise you can go as per your brand preference. Hitachi is also a premium brand and being the most efficient makes it a good choice.

193

Hi Abhishek

Thanks for your reply. I have done enquiry in my locality for after sale service for hitachi ac. Everybody is saying it is pathetic. Can you share your views about lg model.

194
Abhishek Jain (Mod)

Hi Avik,

LG JS-Q18NUXA would be your next best options. It has good ISEER of 3.86 with copper condenser. And in general LG models are good in handling voltage and also have good air filters as well. The dual inverter tech can also help achieve lesser noise. You can certainly go for it.

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