Electricity Saving Tips For Homes And Offices

Things that impact electricity consumption in air conditioners

By on April 27, 2016

It’s peak summer, and one thing that worries most people is: electricity consumption by air conditioners. No wonder, while buying air conditioner, people look for the most energy efficient ones, as air conditioners can bloat the electricity bills quite easily.  Although buying an efficient AC does help, there are more things that impact electricity consumption of an air conditioner while one uses it. While going through an interesting research paper on IIT Madras website we stumbled upon this interesting concept of looking at what impacts electricity consumption in air conditioners, which resulted in this article. Listed below are things that impact electricity consumption:

1) Room Size

All ACs are rated in watts, but they do not consume the same all the time. Most 1.5 Ton ACs are rated for about 1.5 kW to 2 kW. But their consumption varies in different settings. The job of an AC is to remove heat and humidity from and enclosed space and it will consume just that much amount of electricity that is required to do so (plus or minus delta based on AC sizing). Which means a 1.5 ton AC if put in a 120 sq ft room will consume different amount of electricity in one hour than a similar AC put in 150 sq ft room in the same location (and in similar conditions). This is because heat will be more in 150 sq ft room and thus it will take extra electricity to remove it.

2) Location (or Temperature profiles of various cities)

Some cities are hot; some are humid and some cold. An air conditioner does 2 things: cool the air and remove the humidity. If a city is hot, most of the electricity is consumed to bring down the temperature. But some cities are humid but not very hot (costal regions) and because the switching of the compressor depends on temperature. So a 1.5-ton AC in a similar setup in 2 cities will consume different amount of electricity because the temperatures are different. The consumption will be less in the city with lower temperature.

This also brings up a point that the tonnage of AC required for a room varies across cities. A city that is more humid does not require much cooling but needs more of humidity removal. Humidity removal depends on the time for which compressor runs. If the AC is oversized, compressor will run in short cycles and thus will not be able to remove humidity effectively. Thus it makes sense to buy smaller ACs for a humid place. On the whole sizing of air conditioner is important.

3) Colors in the room

From colors in the room, we don’t just mean the color of the walls. All dark colors absorb heat. So if your curtains are dark, they do not help. If your walls are dark they absorb heat. Even if you the cloths you are wearing in the room are dark, they absorb heat and will take more time to cool. If everyone in the room is wearing dark jeans! it means your AC is working harder. Most of these things are unavoidable, but some of it might help if you are aware of it.Science of Colors

4) Number of people in the room

Recently a friend called us up regarding electricity bills in his coaching classes. On evaluation we realized that he had 2×2 ton ACs in a small room of 150 sq. ft. and both had to be kept on when the classes were on. A class full of 40 kids had so much heat that it needed so much cooling. Human body emits heat based on its metabolic rate. Thus more the number of people, more is the heat in a room and thus more cooling is required. This if more people are expected in a room, more tonnage is required to cool the room.

5) Electronic and Electrical appliances emitting heat

We often observe that our laptops or computers become after long operation. Even mobile phones behave the same way. All electronic and electrical appliances emit heat that will be cooled if Air Conditioner is turned on. Even bulbs and lights emit heat along with light (more on it on our article: LED light bulbs buying guide). Thus if you put a lot of lights in a room, the room will need more air conditioning. Thus using lesser lights will have double benefit.

6) Every solid object absorbs heat (thus keep a room less stuffed)

A warehouse full of material typically needs a lot of air conditioning, because every object kept in the space needs cooling. Every solid object is a conductor of heat and thus more the number of things in a space, more is the cooling required. Keeping a room organized thus makes much more sense not just for aesthetic beauty of a room, but also for air conditioner’s electricity consumption. Keeping things in closed almirahs can thus reduce some electricity used by an air conditioner. The walls also absorb heat and thus insulation of walls is important.

And now a few things that we have already covered in previous articles:

7) Air Conditioner temperature

In our article on Ideal Air Conditioner temperature for electricity savings we wrote that the electricity consumption of air conditioners depends on the thermostat temperature. The lower you keep the air conditioner temperature; higher will be the electricity consumption.

8) Space to be cooled

In point 1 we talked about size of the room impacts electricity consumption. It essentially means that the space to be cooled is more in a bigger room that needs more electricity to be cooled. In a previous article: Increase Air Conditioner effectiveness and save electricity by closing doors and windows, we pointed out how if the doors and windows are not closed, the space to be cooled increases. Thus it is important to close the room completely in order to optimize the space to be cooled. It also means that the doors of the almirahs, etc. in the room should be closed when air conditioner is switched on. Open almirah door not only add space to be cooled but also add to the number of objects in a room to be cooled.

All these factors impact the load on air conditioner and can not only impact your electricity bill, but can also impact your capital cost of buying an air conditioner. If optimized well even a small sized AC can cool the room effectively.

Here is a short video for tips to reduce power consumption of air conditioner in India

Related Articles

The short URL of the present article is: http://bgli.in/NsbAu

Please use the commenting form below to ask any questions or to make a comment. Please do not put the same comment multiple times. Your comment will appear after some time. Also please note that we do not reply to emails or comments on social media. So if you have any question, please put it in the form below and we will try to reply to it as soon as possible. If you are asking for an appliance recommendation, please be as specific with your requirements as possible because vague questions like asking for "cheap and best" would get vague replies.

अगर आप के कुछ भी सवाल हैं, वह आप नीचे दिए हुए सवाल-जवाब सेक्शन में पूछ सकते हैं। आप अपने सवाल हिंदी में भी पूछ सकते हैं और हम आपको हिंदी में ही जवाब देंगे। कृपया एक ही सवाल को बार बार ना डालें। आप एक बार जब "submit " बटन दबाएंगे, उसके बाद आपका सवाल यहाँ दिखने में थोड़ा टाइम लगेगा। कृपया धैर्य रखें। अगर हमारे पास आपके सवाल का जवाब है तो हम उसे जल्दी से जल्दी जवाब देने की कोशिश करेंगे। कृपया अपने सवाल ई मेल या सोशल मीडिया पर ना डालें।

Add comment

E-mail is already registered on the site. Please use the Login form or enter another.

You entered an incorrect username or password

Sorry, you must be logged in to post a comment.


by Newest
by Best by Newest by Oldest

What is BTU ,EER ,BEE & COP in hindi


Sir after going through ur website page. i purchased ogeneral 2 ton window 3 star last year before may and the electricity bill for ac came 36000/- for 3 months. now this year again the bill for summer is 30000 ... please help what should i do ... should i sell the ac or what? HELP ... There is no line fault or meter fault it is all because of this new ac. because we were using samsung 1,5 from 13 years and never saw such a hike

Abhishek Jain (Mod)

Hi Chinmay,

I guess you just looked at the list without going through the content of the website. Had you gone through the rest of the content, you would have never purchased a window AC, leave apart a 3 star rated one. You purchased an AC which is one of the least efficient model in the market. Window ACs are not efficient (period). BEE 3 star in window ACs is lowest efficiency in the market. On this website we talk a lot about choosing the right AC based on size of room, location, usage, tariff. We also mention that people should go for least efficient model only if the usage is minimal. You have to go through all of it before choosing a model.

Now without knowing your usage I cannot comment is 36000 bill is justified or not. If you use it only for 1 hour a day then it may not be justified, but if you use it for 12-14 hours a day then it may be completely justified. Please do not buy products as an ignorant consumer, make an informed judgement and that is why we try to put so many details on the page. But if your ignore the rest of it and just jump to only some specific sections, you will not get a right answer.

And by the way a 2 ton AC will certainly consume more electricity than 1.5 ton AC. And 2 ton AC is NOT a replacement of 1.5 ton AC. You need to know how much a room requires before making a purchase!!


we had close to $500 of an electric bill for the month of July. Then the AC broke and we were without it for over 3 days but the electric bill showed only $10 less. How could that be? Nothing else changed the fans were going just like the month before. I called SCE and complaint but she said that even though the ACC was not working it still ran electricity. Can someone tell me if that is so. I will appreciate any answer on this. Thank you.


Sir, I have 2 questions.
1. Does the AC consume more electricity of I keep the fan speed at top? (4). Is there any relation between the fan speed and electricity consumption?
2. I have a Samsung 1.5 tom 3 star I better A.C. Model no. AR18KV5HBTRNNA. It runs average 8 hours per day. How many units does it consume in a month?
Thanks in advance.

Abhishek Jain (Mod)

There is certainly a relation between Fan speed and electricity consumption. Higher fan speed has more electricity consumption. But fan power consumption in an AC is not a lot. It is the compressor that consumes the most. But yes at higher fan speed the air circulation in the room is more so power consumption will certainly be more. But at low fan speed the whole room may not cool well.

Your BEE 3 star AC would be consuming about 1-1.2 units per hour. So in 8 hours it would consume 8-10 units per day, so about 240-300 units a month.


I have two adjacent rooms of 12 ft x 10 ft and 9 ft x 9.5 ft. However, for the smaller room I cannot set up either a window or a split AC due to builder restrictions. I am thinking to put a 2 T inverter AC in the larger room and fit an exhaust fan in the wall connecting the two rooms such that the fans are normally closed and open only when the exhaust fan is switched on. This may not be the most efficient way but otherwise I cannot have AC in the smaller room making it unusable. Please suggest whether this will be a workable solution??

Abhishek Jain (Mod)

200 sq ft space in Baroda needs 1.7 tons of cooling. You need air circulation between the two rooms to cool the room properly. Or you need an AC with longer air flow (good enough to cover a large area), something like those from Mitsubishi Heavy. A split AC would be a much better option and energy efficient option.


I have a room 10 ft x 9.5 ft x 9 ft in Baroda with no wall having direct sunlight but having large windows on 2 walls of the room with a single occupant.
I have two window ACs available with me (I) 0.75 ton 1-Star AC EER = 2.48 and (ii) 1.5 ton 5-Star AC EER = 3.29.
Which one of the two should be installed if I intend to operate are nearly 20 degree celcius for cooling?
Which one of them will consume less electricity.

Abhishek Jain (Mod)

Hi Amit,

Any reason why you could not install a split unit in the room? Both the options are not energy efficient I would say and then again running them at 20 degrees will not be thermally comfortable and it will consume more electricity.


i have 1.5 tonne 3 star invertor AC with nearly1000 watt and i use it 6 hours a day at 26 degree. Can you tell me what will be its unit consumption per month

Abhishek Jain (Mod)

Which brand and model is it?



Abhishek Jain (Mod)

It would be about 120-140 units a month.


I want to buy an AC for my office room(124sqft,10f height) in Siliguri. AC will run approx 6months, 8 hour basis. Should I go for 3star Inverter AC or 5 star normal AC, My choices are LG and Voltas. Please suggest, Thanks!

Abhishek Jain (Mod)

Hi Rajib,

The difference between 5 star normal and 3 star inverter in terms of energy efficiency is not huge. There is lot of overlapping in the slabs of energy efficiency of the two. Some BEE 3 star inverter ACs are not as good a some BEE 5 star non inverter. But in general 3 star inverter ACs (the better ones) are a better choice as compared to BEE 5 star non inverter. What is your budget for this AC? In Inverter AC you can look at any of these:

VOLTAS 123V EY (Flipkart Link: http://fkrt.it/uInn1!NNNN )


OK... I will check again.
So is it OK if eer is 3.6 for 1.5 ton.

Abhishek Jain (Mod)

EER of 3.6 is good.



It shows eer 5.1 w/w.
I don't know whether it's correct or not.

Abhishek Jain (Mod)

Formula for EER is cooling capacity divided by power consumption.

In your case it is 5100/1415 = 3.6


Hi Abhishek,

I am planning to buy a split ac 1.5 ton 5 star for my living room.
I am looking for carrier one model 18k ester 5 star copper condenser.
could you please suggest me about the carrier as brand for ac and also please need your suggestion whether this model is good to buy or suggest me any good brand with model name.

Also, one of my friend suggest me to buy Daikin. so which is a good brand.
what is the difference b/w cylindrical outer unit and regular outer unit. which is good one in performance.
my living room size is 14*20 .




Thanks a lot for your time and response. i have ordered carrier 1.5. but i want to know one thing i saw Power input measure in specifications what does it mean some show 1370 watt some 1480 watt. which one is good and what it imapcts on performance or electricity consumption.

also what is EER - which is better one 3.5 or 5.1 and again what impact and on what.


Abhishek Jain (Mod)

There are couple of things that are important while you look for an AC: 1) Calculate the right cooling capacity (or tonnage) and make sure that the AC you are buying does have that cooling capacity. 1 ton is equal to 3504 watts. So if you are buying a 1.5 ton, then the cooling capacity should be as close to 5256 watts as possible. Cooling capacity denotes how fast the AC can remove heat from a room.

2) You need to look at EER. Higher the EER better is the way in which an AC uses electricity. EER is a ratio of cooling capacity divided by power consumption.

So even through an AC is consuming 1480 watts, but if its eer ratio is better then it means its cooling capacity is more. And it will cool faster. But if an AC has high power consumption but low EER, then it consume more power and gives less cooling.



Thanks.. I have checked specifications of the one have already ordered as per your suggestion -
It has-
EER - 5.1 w/w eer
Power input - 1415 w
Cooling capacity - 5100 w.

Also, please seggest me brand of stabilizer for 1.5 ton carrier.
How much Watt required in stabilizer.

Abhishek Jain (Mod)

I guess you wanted to mention 3.51 as EER. Also the choice of stabilizer depends on how low your voltage goes. So for e.g if you buy a stabilizer with input voltage range of 170-260V then the AC will stop working if the voltage goes below 170V or above 260V. So you will have to check the voltage range that you get in your house before buying a stabilizer. Usually 1.5 ton AC needs 5 kVA stabilizer.

Abhishek Jain (Mod)

Hi Ajay,

Depending on your city, a 1.5 ton may not be able to cool the whole room of 14x20. So it may fall short. But then it is good that you are not going for an inverter technology air conditioner. A BEE 5 star rated one would be good. Carrier is a great brand and is among premium brands. So you can certainly go for Carrier 18K ester. Daikin is also a premium brand. But the choice depends on your budget.

Also in terms of performance, I do not see any major benefit of cylindrical outer unit as compared to regular outer unit.


Hi Abhishek, I am planning on air-conditioning my new office space of about one room with 470 Sft and an adjacent room of about 250Sft partitioned into three rooms where the partitions do not touch the ceiling. I have false ceiling everywhere, should I consider the regular split AC with wall mounted indoor unit or the ceiling mounted cassette type indoor unit. Are cassette type ceiling mounted indoor units better than wall mounted?


Abhishek Jain (Mod)

Hi Suraj,

You will find that wall mounted models are more feature rich (having filters, sensors, etc). Cassette type indoor units are not that fancy. On top of it, if you look at the current catalogue of cassette ACs, you will find that they are not very energy efficient. However, efficiency depends a lot on outdoor unit and not only on the indoor unit. But if you go for a multi split inverter AC system with cassette type indoor units, that should also work well. But then you can go for multi split wall mounted indoor units as well, it will not make a whole lot of difference. As long as your outdoor unit is efficient, the overall efficiency would be good. Check for multi split units from Daikin, Hitachi, LG or Blue Star..


I did buy Panasonic cs- kc15sky5r which is 1.2 ton 5 star AC, for my 130 sq ft top floor room in bengal . EER is 3.65, and power consumption is 1110W, whereas the cooling capacity is 4050. My question to you is, can you please give me an idea about the total unit consumed in a day if i run it for 6 hours ? and my second question to you is the ac which power input shows 1460W how come it consumes 1110W (which is written on the box ) and the last question is the ac box saying 100% copper tubing. does it mean the condenser also made of copper or only the tube?
waiting for your kind reply .

Abhishek Jain (Mod)

Hi Rishi,

Panasonic KC15SKY5R is not a 1.2 ton AC. It is a 1.5 ton AC as mentioned in its specs: http://www.panasonic.com/in/consumer/air-conditioners/split-ac/kc15sky5r.specs.html .... and its power consumption is 1488 watts (again as in the specs). The EER ratio is 5250/1488 = 3.52 which is BEE 5 star non inverter. And this is certainly a 100% copper AC (which means even the condenser is made of copper).


Thank u for ur reply. But in the website and the dealer mentioned that it is a 1.2 star machine even on the BOX it is mentioned - POWER CONSUMPTION is 1110 and cooling capacity 4050 (but in site its 1400+ and 5000+), Did I make a good choice ? Or I should have gone for another one .What would be the power consumption of this ac? or should I go for Panasonic KC12SKY5R.plz halp me regarding this matter

Abhishek Jain (Mod)

Hi Rishi,

Difficult to comment. Because if it is 4050 watts cooling machine, then it is a 1.2 ton machine. And at 1100 watts it is quite energy efficient as well. So if it is really the same, then the machine is very good. I would suggest that you doubly confirm with the dealer. Because if the specs are the same as you have mentioned, it looks like a great choice.


I Have Lloyd 1.5 Ton Split AC
My Bills are approx 4 to 5000 Per month during summer
i want to know does 5 star AC saves Electricity
and also Window AC saves more electricity compare to Split AC

Abhishek Jain (Mod)

5 star ACs do save electricity if installed and used right. I hope you have done right sizing of the AC (it is not oversized). Also I hope you close the room when the AC is on. And the room is well insulated (as much as you can).

Efficient options in Window ACs are much less and so I would say Window ACs do NOT save more electricity as compared to split AC.


I want to purchase 1.5 ton window ac for room dimension 12*10.Pls. suggest me best window ac

Abhishek Jain (Mod)

Here are some window ACs you can look at:

Hitachi RAV518HUD (Amazon Link: http://amzn.to/2negUKO , Flipkart Link: http://fkrt.it/AF7GETuuuN )

Hitachi RAT518HUD (Amazon Link: http://amzn.to/2mMYF3P , Flipkart Link: http://fkrt.it/AFS7ETuuuN )

Hitachi RAW518KUDZ1 (Amazon Link: http://amzn.to/2ocvFS0 , Flipkart Link: http://fkrt.it/1mVbV!NNNN )

Whirlpool MAGICOOL COPR 5S (1.5 T) (Amazon Link: http://amzn.to/2oNmclY , Flipkart Link: http://fkrt.it/1I!kV!NNNN )

Panasonic CW-KC1816YA (Amazon Link: http://amzn.to/2ph4t6k )

Voltas 185 ZYA (Flipkart Link: http://fkrt.it/1IXl3!NNNN )

Blue Star 5W18GA (Amazon Link: http://amzn.to/2ob8JQW , Flipkart Link: http://fkrt.it/RqJcM!NNNN )



Thanks for the tips. I have got a new LG 4-star Dual-Inverter of 1.5 Tonne capacity. I have installed it in my hall which is in the ground floor and there is no room on top, the terrace gets a lot of sun. I live in Chennai, it is May and the weather is very bad now. The temperature is around 37-38 C all the time during the day and the feels like is around 43-48 C all the time.
The problem I am facing is that, the power consumption of the AC is very high. When i switch on the AC @ 11, it consumed 2.9 units per hour. This seems to be very high. The LG salesman promised me that the consumption will be around 5-6 units for 8 hours. Can you tell me what might be the problem? Is the AC bad or is it the heat or is there some other problem.
Looking forward to your help here. Thanks in advance.

Abhishek Jain (Mod)

All depends on the heat load. Can you check the tonnage requirement for your room using the calculator on this page: https://www.bijlibachao.com/top-ten-appliances/best-air-conditioner-ac-window-split-hitachi-lg-carrier-samsung-electricity-consumption-tonnage-in-india.html

Let me know what it suggests. Also do you keep the room closed or the doors etc are open?


Hi, i just got a new 5 star 1.5 Ton Godrej AC, which has a capacity of 4900W, and power in put of 1396 W. Please help me calculate what will be my average monthly bill if i use 8 hours per day at around 25 degree celcius.

Abhishek Jain (Mod)

Assuming your AC is rightly sized. It's cycle time would be about 45 mins in an hour. So it would consume 1396*0.75 = 1.047 units in an hour. So in 8 hours it would consume about 8.4 units of electricity. Bill will depend on electricity tariff in your city and the slab that you lie in.


Hi abhishek,
I have a 250 sqft hall(Pune) No direct sunlight comes to the appt. Can 1.5 ton AC work or do I need 2 tons only. My reqt is 6-8 hrs daily for 90 days a year only. I would really appreciate if you can let me know if I can save money in buying a 3 star normal rather than 3 star Inverter considering my reqt. I am getting Diakin 1.8 tons 3 star split for 41k and Bluestar 5 star split for 43.5k here. 3 star Inverter is between 49k (Voltas) to 52k( Diakin)
What should I do?

Abhishek Jain (Mod)

Hi Deepak,

If you wan to cool the full hall during day time, then you need 2 ton cooling. But if you are fine with not cooling the whole room, then you can go for a smaller tonnage (non inverter AC). Usually ACs have a certain range of impact (distance from the indoor unit). A 1.5 ton AC can cool up to 10-12 ft. But beyond that, the cooling may not be felt. So you will have to install the AC close to the seating area and then it would be good. I would not recommend to undersize inverter AC because they are not very energy efficient when they are undersized. You can go for a normal BEE 5 star rated AC and if a Blue Star 5 star AC of 1.5 ton fits your budget, then I would suggest that you go for that.


Thanks Abhishek,
I think the position of indoor unit will be far away from my sitting area because of power point. The hall is around 250sqft.
I am not sure if 1.5 ton 5 star will suffice. I may also use it during day time of weekends. Between 1.8 non inverter 3 star( diakin) @41k and 2 ton 3 star (Bluestar/non inv/alum)@ 43.5k or 2 ton Videocon(5 star/non inv/copper) @41k which one would you suggest. I will appreciate your suggestion.

Abhishek Jain (Mod)

Ah! That's a difficult choice. Firstly I must tell you that most brands sell 1.7-1.8 ton marked as 2 ton. So the Blue Star and Videocon models would be 1.8 ton in cooling. Seconly the choice is difficult as you have a model from a premium brand which is not so efficient. And then you have a model from a not so popular brand which is quite efficient. And it is not that the other AC will not work. This is like choosing between an old iPhone model and a new micromax high end model :). Both will work. I would say if you want electricity savings then go for Videocon 5 star model.


Getting Videocon latest model which has 5 star , 2 ton with EER of 3.51(Cooling Capacity:24kbtu, input:1751) R410a Refridgerant. Copper condensers and piping , gold fin IDU. Seems a good deal @ 39k All inclusive( installation etc) 2017 model
What do you say?

Abhishek Jain (Mod)

You can certainly go for that.


Hello I have hitachi 1.5 ton which has an auto mode which is quite confusing. You can't set a temperature in that mode instead you can increase or decrease temperature by 3 degrees, which makes me wonder what is the base temperature that it is taking? can you explain this?

Abhishek Jain (Mod)

Hi Sunil,

Which model do you have? Did you receive any user manual with it? User Manual should have the details. Auto Mode usually has a set temperature for comfort and the settings (temperature and fan speed) are modified automatically by the AC to maintain the comfort level. If you want to change temperature and other settings, you can use the cool mode.

makesh Jayaraman

I brought Hitachi RAU518MWD 1.5 ton 5 star.they term it as iconnect..Is that model is good one..they mentioned as 100% copper..but for anti corrosion.i have no idea..If that model is not good ..pls reply .so that i will return

Abhishek Jain (Mod)

All Hitachi models are 100% copper. So it is certainly copper. It's EER is 3.7 so it is one of the highest energy efficiency non inverter AC model from Hitachi. SO it is certainly a good one.


i am searching to buy AC for 130sq feet room. As i am leaving on top floor and city temp goes max to 46-48 degree C as presently it is around 43 degree C. So plz suggest me good AC with power consumption in 5 star rating. Also suggest whtr to go for inverter or non inverter ?

Abhishek Jain (Mod)

From what you have described, 1.5 ton looks like a certain need. Choice of inverter/non inverter depends on your electricity tariff and usage in hrs/year. To make it simple we have given a calculator on this page that can help you decide: https://www.bijlibachao.com/top-ten-appliances/best-air-conditioner-ac-window-split-hitachi-lg-carrier-samsung-electricity-consumption-tonnage-in-india.html

Inverter ACs certainly save more than non inverter ACs, but choice depends on budget and consumption/tariff. Try to choose one type and star rating based on calculator and let me know your budget and I can suggest you some models.


Thanks for reply.
Expected Consumption is 1600 to 1700 Hrs/year. Yes power consumption is to be considered as tariff is also matter. Please suggest good brand with model number having power consumption and having proper service support as I am leaving in Wardha Maharashtra..i think limited company service station in our area....plz reply

Abhishek Jain (Mod)

Hi Swapnil,

As I mentioned earlier, I cannot make any recommendation without knowing the tonnage that you want to go for and your budget. You can calculate the tonnage using the calculator given on the link in the previous comment.


Getting result from link:

Size of Air Conditioner that you need:1.5 Ton (For cooling requirement of 1.6 Ton)
(As per calculation of tonnage from link)
and budget in range of 35k-40k but power consumption should be less.

Abhishek Jain (Mod)

Any of these would be good for you:

LG JS-Q18NPXA (Amazon Link: http://amzn.to/2og68YR )
Godrej GSC 18 MINV 3 RWPM (Flipkart Link: http://fkrt.it/4zbS3TuuuN )
Voltas 183V EY (Flipkart Link: http://fkrt.it/I8qMF!NNNN )
Voltas 183V IY (Amazon Link: http://amzn.to/2nkfSSI )
Blue Star 3CNHW18NAFU

LG model above is aluminium condenser. Avoid it in case your environment is corrosive.


All u suggested are 3 star rating...any suggestion for 5 star rating?

Abhishek Jain (Mod)

Hi Swapnil,

Difficult to get BEE 5 star rated inverter AC in your budget. They are expensive. Are you looking for BEE 5 star rated non inverter AC? If yes, then those you can get in your budget, but then going for inverter AC is better as they are more energy efficient.


Getting result from link:Outputs
Size of Air Conditioner that you need:1.5 Ton (For cooling requirement of 1.6 Ton)
(As per calculation of tonnage from link)
and budget in range of 35k-40k in 5 star rating so that power consumption should be less.

Abhishek Jain (Mod)

Any of these 3 should be good for your use:

Daikin ATF50

Hitachi RAU518KWD (Amazon Link: http://amzn.to/2ohypfi , Flipkart Link: http://fkrt.it/x3EHM!NNNN )

Carrier Superia 5 Star (Amazon Link: http://amzn.to/2ooznZA , Flipkart Link: http://fkrt.it/x3sRV!NNNN )


Thanks for reply.
Expected Consumption is 1600 to 1700 Hrs/year. Yes power consumption is to be considered as tariff is also matter. Please suggest good brand with model number having low power consumption and having proper service support as I am leaving in Wardha Maharashtra..i think limited company service station in our area....plz reply


Hello Abhishek!

Recently I got 2 ogeneral 1.5 split ac with 2 star rating for my two different rooms. Actually I thought they were 5 stars as I bought them from one of my relative at cheaper rate. (It was my mistake that I didn't verify the BEE ratings before buying). So my question is, how much difference would make with electricity consumption between 2 and 5 star AC if I use it for 6 hours a day?
Model number is ASGA18FMTA With 1830 watts. Thank you!

Abhishek Jain (Mod)

Usually if the AC is rightly sized (your room needs 1.5 ton and you have a 1.5 ton AC), then the compressor runs for 80% of the time. So in an hour your AC would consume approximately 1830 * 0.8 = 1464 Wh or 1.464 units of electricity. Truly depends on the cycle time.


Hi Abhishek,
Please suggest AC for place Gandhinagar ,Gujarat . My room size is 120 sq feet.

Abhishek Jain (Mod)

Hi Anees,

To make a suggestion one needs to know a lot of things: Right size needed, right star rating needed and the budget as well. I would suggest that you use the calculator on this page: https://www.bijlibachao.com/top-ten-appliances/best-air-conditioner-ac-window-split-hitachi-lg-carrier-samsung-electricity-consumption-tonnage-in-india.html

This will help you calculate the right size. If you input your usage hours, it will provide you details of approx cost of buying different star rated ACs and will also give you approx electricity bills that you would incur on different star rated ACs based on your usage and electricity tariff. Once you know the tonnage, star rating and budget, I can recommend you something.


Thanks Abhishek,
According to that it would be fine to have 3star, 1.5 T . My budget is 30k approx .


Go for Whirlpool 3D Cooling
It has 3 way cooling
Rs 30,800 with Installation from Croma

Abhishek Jain (Mod)

Hi Anees,

If you are interested in purchasing a BEE 5 star rated model then I would recommend that you check this one:

Panasonic CS-KC18RKY-1 (Flipkart Link: http://fkrt.it/g0G1kTuuuN ) .... it is a good brand and the biggest point is that it is BEE 5 star rated and would save you good amount of electricity and will also fit in your budget.

Else you can look at these:

Daikin ATC50 or FTC50
Hitachi RAU317KWD
Whirlpool 3D COOL HD 3S (1.5 T) (Flipkart Link: http://fkrt.it/g3L3STuuuN )
Lloyd LS19A3GR (Flipkart Link: http://fkrt.it/tpQRM!NNNN , Amazon Link: http://amzn.to/2mKC3MV )
LG LSA5NP3A1 (Flipkart Link: http://fkrt.it/tVt62!NNNN , Amazon Link: http://amzn.to/2mEqesp )


I got a new LG inverter ac of 1.5 tons and i am worried as it consumes lot of power. I dont use much... I check by using it for one hr (26de) and it consumes nearly one unit and some time more than one unit... and i used for one night and again it consumed four units... its a small room of 120sqfeet with all windows closed... will there be any problem in the ac machine to consume more power or is that natural.... the ratings says 4.20 ISEER and the watts is 1060.. Pls clear my confusion and help me in gaining some peace... afraid of current bills I have kept ac off from the day i bought...

Abhishek Jain (Mod)

Hi Imtiyaaz,

Depends on the temperature in the city/room. 1 unit in first hour may be justifiable because initially there is lot of heat in the room and the AC has to cool it down (any AC will work hard initially, inverter or non inverter). Also 4 units in 8 hours also looks justifiable to me at night. I would say, observe it for sometime and see if it is really high or not.


Thanks. It helped. Yes the readings attached with ac to says 628 units in a year for 1000 units... which comes to this calculation again... Thanks a lot


i am looking for 1 ton 3 star ac for mumbai house. want to ac with either R410A or r32. suggest some models & among these two which refrigerant is better.

Abhishek Jain (Mod)

I think R32 is better. Daikin FTC/ATC range will have R32. If you want R410A then you may look at Mitsubishi Heavy SRK12CR-S6, it has R410A and is a very energy efficient model.


Hi Abhishek,
I have bit difficult situation..I have recently shifted to Chennai(humid place). My bed room is approximately 90 sq ft., attached to room is my drwaing room (approx. 180-200 sq. feet). Now I wish to install an ac in bedroom in such a way that cool air can reach the hall when I am not using my bedroom and watching tv in the hall (I will install the ac in the bedroom in such a way that ac is facing the bedroom's gate so that air flow towards the hall is direct).
I have 2 ton samsung ac approx 6 years old with no star rating (planning to use it).
My concern here is :
1. if a go for a 2 ton ac then will it be able to remove humidity when I am sleeping in bedroom (closing the door) without consuming more electricity?(sleep time approx 8-10 hrs).

2. If not option 1 then What capacity and star rating ac should I go for which can fulfill my purpose?

Ankit Sethi.

Abhishek Jain (Mod)

Hi Ankit,

It is not a good idea to use one AC for two room. Room ACs are not designed to work like that. Also if you use a 2 ton AC for 90 sq ft room keeping the door closed, it will not be able to remove humidity properly and on top of that it will be super oversized for it.

For a 90 sq ft room a 0.75 ton AC would also be more than enough. If you can go for an inverter tech AC then a BEE 3 star rated inverter tech AC would be good enough.


Hello Abhishek,
Thanks for a very helpful information.. Just 2 more doubts..
1. inverter acs are not coming with BEE ratings. should i specifically look fir inverter ac with bee rating?
2. is it ok to go for 1 ton 5 star ac for my requirement?


Abhishek Jain (Mod)

Hi Ankit,

Inverter ACs do come with star ratings. However, not all brands have got their models star rated. Hitachi, LG, Daikin, Godrej, Blue Star, Voltas have got their models star rated. You can look at the top efficient models over here: https://www.bijlibachao.com/top-ten-appliances/best-air-conditioner-ac-window-split-hitachi-lg-carrier-samsung-electricity-consumption-tonnage-in-india.html

If you are going for a fixed speed AC then try going for 0.75 ton. 1 ton would work but would be slight oversized for a 90 sq ft room.


Thanks Abhishek. Your replies were really helpful. I'm gonna buy 1 ton ac only because while leaving chennai I can take it back to my hometown and use in my house.


Pls. Give any 1 name for 1 ton inverter ac

Abhishek Jain (Mod)

Hitachi Kashikoi 5400 series has the most energy efficient inverter AC model in the market.


Thanks sirji


Dear Abhishek
Pls. Give link of actual power consumption & actual cooling watts of market ac as per your team test.

Abhishek Jain (Mod)

Hello Mr Ajay,

We do not do actual tests of ACs from the Market. That will be a super expensive exercise (and we do not have the budget for the same) as there are more than 1000 models in the market. We get the data from BEE (Bureau of Energy Efficiency) which in turn publishes what is reported by the manufacturers themselves. So the data on this site is what the manufacturers have reported.


Dear sir ji,
I was seen one time on this site as PDF file but now i forgot Pls. Find it.
It's have actual results in lab test for power consumption & cooing

Abhishek Jain (Mod)

There is an organization called Consumer Voice which is into testing of some random samples of air conditioners. They select some 5-10 odd air conditioners (from various brands and various star ratings) and do some tests on them and publish their report: http://consumeraffairs.nic.in/consumer/writereaddata/SplitAC.pdf


Live in Chennai, first floor open to terrace. 100 sq feet room. As per the calculator provided by you, I went for a 1.2 Tons voltas ac. Earlier Iused 1.5 MT samsung. I found cooling of 1.2 mt is not as much as 1.5. pls explain.

Abhishek Jain (Mod)

Cooling of 1.2 will never be same as 1.5 because the cooling capacity of the two are different. If you put a 2 ton AC it will have more cooling than 1.5 ton because it has more cooling capacity. The calculator suggests the right cooling capacity that can bring down the temperature to 25 degrees in a decent time. Which is ideal cooling and also ideal use of electricity. You can put 1.5 ton if you want to cool more, just that it will consume more electricity.


Many thanks. Given same temperature and room size, will a bigger AC cool room faster than a smaller. For example let us assume ithere are two identical rooms having same size and environment ( sun light falling on roof walls etc ). How longer will a 1.5 ac take to bring down the temperature and how long 1.2 tons would take ? Will the larger one cool faster thereby saving consumption ? Pls clarify

Abhishek Jain (Mod)

I would suggest that you read this page on our website: http://www.bijlibachao.com/air-conditioners/air-conditioner-work-laymans-explanation.html

It will help you understand how an AC works. Tonnage is a representation of amount of heat an AC can take out in an hour. So obviously a 2 ton AC can take out double the heat as compared to a 1 ton AC in an hour.

Time taken will also depends on the amount of heat flowing in, which will also depend on the temperature outside the room. So it is not something that can be answered easily. Typically sizing is done assuming the hottest day in a year and looking at the size of the room, other factors, etc.


Hello sir,Please go through carefully and thorughly ,I nedd your kind suggestive view over my issue, I am planning to buy an inverter technology based split AC for my 13x10x10 sft well packed bed room on 1ST floor (above that 4 more floors are there ) loacetd in Patna. only WEST side walls come under sunlight for foew hours.By using site based calculator of Blue star/sharp for wright tonnage we come know with 1.0 Tr.Air condition will be ideally operated for 6-8 hrs a day for max 4 people for summer season only.
Plz suggest considering low purchasing power..........
1.Correct size according to you ?
2.If Usage is ideal (1000-1200 Hrs in an year) and using Inverter tech. based Ac then go for BEE 3* rating or, BEE 5 * rating.
3.18FG6BOG model no. of godrej, is it inverter Tech. based ?
4. If Go with blue star then which model no.

Abhishek Jain (Mod)

Hi Suraj,

I would first suggest you to use the calculator on this page on our website: http://www.bijlibachao.com/top-ten-appliances/best-air-conditioner-ac-window-split-hitachi-lg-carrier-samsung-electricity-consumption-tonnage-in-india.html

It takes in a lot of parameters that you have mentioned and will do the calculations and answer to many of your questions on Sizing and choice of star rating. If you still have questions, I will be happy to help. But first please use the calculator.


Hi Abhishek , with reference to our on going conversation and as you suggested product of two different comapny Like Voltas and blue star in your previous post.So you please go with model no in 1.5 Ton capacity with similar performance in all aspect like EER,Coolant Type,Star rating performance and lastly price. I respect your neutralize view but i want to be an aware/ alert consumer with environmental care.You can understand the imapct of a wrong buy. I am completely agree with brands of your suggestion they are the company of its own repute in theire defined segment.You also please brief about PFC type condenser as some model no. of godrej appliances come with this.

Abhishek Jain (Mod)

Hi Priya,

We have explained PFC and copper condenser in detail on FAQ no 13 on this page: http://www.bijlibachao.com/top-ten-appliances/best-air-conditioner-ac-window-split-hitachi-lg-carrier-samsung-electricity-consumption-tonnage-in-india.html

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 but if it fails it need to be replaced. Although they come with anti corrosion coatings, but still fixing the small multi channels in case of clogging is difficult. Manufacturers specifically mention PFC or Multi Jet. PFC will look like this: PFC

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. Blue fin is the best for corrosion protection. Blue fin will look like this:


Abhishek, The Daikin split ac models that I hv bought, i'm going to install them soon. These ACs don't have Anti-corrosive coating on the Cu tubes. Do you recommend any Anti-corrosive chemicals which is available in the market, and what would be the price

Abhishek Jain (Mod)

Ideally, it is better to take a model with corrosion protection. But if it does not have then you need external coating. I do not know of any which is in my knowledge, but searching on google I found something like "Clear Guard Copper Preventive Coating" available in India which is for air conditioners.


Hello Abhishek, Getting in touch with you after a long time after, In continuation of our previous dicussion would like to ask you which coolant is the most environment friendly either R290 or, R410 A .Writing you some model no.of same capacity of 1.5 Ton with their price of my own desire so u plz suggest which one should be preffered.1.18FGW5WOG @ 44450 INR, 2.18FG5WOG @ 44450 INR 3.18FG6BOG @ 50990INR and lastly 18TSZ5RWP[email protected] all are from Godrej. If any other brand which is parrelel in performance ,services after sale and also with reduced cost is in your mind you can recomend herewith.Purpose of choosing godrej brand is store outlet is near to my house.

Abhishek Jain (Mod)

R290 is more environment-friendly than R410A. But please note R290 is similar to LPG and thus is flammable. Godrej GSC 18 FG 6 BOG is the most energy efficient with EER of 3.7, and yes it has R290. You can also look at Voltas or Blue Star. They are good and economical. However, it will be difficult to get such high EER in them. You can get high EER in Hitachi which would be expensive, or Onida.


Dear Abhishek, I have gone through article on bijli bachao for top 10 energy efficient air conditioners,but in segament of invertor ac in 1.5 ton you have mentioned the models of hitachi, godrej, daikin, voltas those are having ISEER high values.but i would like to bring into your notice there is a model of bluestar BI-5CNHW18PAFU which is having 4.7 ISEER(if i am not wrong).but you have not mentioned this model in list.may be u were not aware of this model or any special reason to not include this in list?i feel u dont like Bluestar personely or people have shared any bad exeperiences with you about bluestar.

Abhishek Jain (Mod)

Hi Amit,

We have to update the list from latest data. You do not see Blue Star because it just recently got a star rating. Our list does not sync in real time with BEE. We have to keep doing our data collection on a periodic basis. And that too for all the appliances (ACs, Refrigerators, Water Heaters, Fans, Washing machines, TVs, Coolers, etc). And after collecting data from BEE, we have to sync it with what the manufacturers have given on their website and the prices on retailers' website. Every appliance takes some time.


hi abhishek once again. i want to ask is there any other reason for more electricity consumption than bigger room and heat load in case of new invertor ac.and can i reduce my electricity consuption if i install my this new inverotor ac in a smaller room

Abhishek Jain (Mod)

There could be a defect in the AC itself which could be causing high power consumption. It is also possible that the AC is facing direct heat outside and the placement of outdoor unit is not ideal. You can certainly reduce electricity consumption if you install the AC in a smaller room. In fact you should certainly try that as it will help you figure out if the AC is faulty or not.


Is 1.5 ton ac is oversized for the room size of 10x11x10 ft.

Abhishek Jain (Mod)

Most likely it would be, but then I would suggest that you use the calculator on this page to check it out: http://www.bijlibachao.com/top-ten-appliances/best-air-conditioner-ac-window-split-hitachi-lg-carrier-samsung-electricity-consumption-tonnage-in-india.html


Sit i purchased hitachi Zunoh 5200f 1.2 Ton 5 star AC, on running the AC my digital voltage meter shows load in amperes between range of 6.4 to 7.3 and the input voltage is between 240-260 volt and the output voltage is between 205 to 227 volt. my question is that company said it consume 4.7 Ampere at 230 voltage than why my AC consume so much Amperes. Please advice, me Sir.

Abhishek Jain (Mod)

The current looks high. You should call up Hitachi customer support to check out why it is high.


Sir what range of Ampere is right one in my case, please advice

Abhishek Jain (Mod)

At 4.7 Amp current at 230 V the power consumption would be about 4.7 x 230 = 1080 watts. So if you get 200V then current should be 1080/200 = 5.4 amp (approx). So it depends on the voltage that the AC is getting.


I have Hitachi Inverter AC. It has silent feature and I use silent mode everytime it is just for noise reduction. I do have Samsung inverter AC but it does not have silent mode. Does use of silent feature increase power consumption?


I have 1.5 ton napolean window ac. What could be the electricity units consumed per hr.

Abhishek Jain (Mod)

I would guess about 1.5 units in an hour or may be more.


Thanks abhishek for your response, I am from Pathankot(punjab).My room is 14*10*12 and gets direct sunlight on roof as well as ODU is also placed on roof.But mostly i am using AC in night. IDU also makes some tik-sound(only once at a time.... i feel perhaps when temp rises once it has achieved desired temp) It cools really really well.before purchasing AC i also used Your tonnage calculator.and After that i thought a 1.5 ton invertor AC ll be good enough.i am actually not getting reason for higher consuption as room size is not that big.what are your views about this model of Bluestar BI-5CNHW18PAFU.I purchased bluetar because there are many good reviews about bluestar.


Hello Abhishek,

Could you please tell me how does Power Consumption (Units /KWH for 1600 Hrs ) is calculated?

I tried searching on your website Power Consumption for HITACHI 1.5 TON KAZE NEO RAU318HVD SPLIT AIR CONDITIONER (WHITE) but coudnt able to find it. Could you please provide me Power Consumption for 1600 Hrs for this model?

Pankaj Naik.

Abhishek Jain (Mod)

Hi Pankaj,

1600 hrs is used only for inverter technology based split AC. It is not used for non inverter split AC. The details of how BEE uses it are given on this link: http://www.bijlibachao.com/air-conditioners/iseer-star-labeling-inverter-air-conditioners-india.html

Hitachi Kaze Neo is not an inverter tech AC. And that is why you will not find power consumption of 1600 hours for it.


hi abhishek.i have purchased BLUESTAR 5CNHW18PAFU MODEL last week as this is an invertor model so i expected it to consume less electricity but what i have observed for my usage of 4or 5hrs hrs it consumes around 8-10 units units.is it ok ? or it is consuming more electricity.Thanks

Abhishek Jain (Mod)

If it is consuming 8-10 units in 4-5 hours then it means that it is running at about 2 kW. I checked the specifications of the model and it consumes 2 kW when it runs at peak load of 1.6-1.7 tons. From your observation it seems that your AC is always running at peak load. Which means your 1.5 ton inverter AC is too small for your room. The heat load in the room is higher and that is why it is running at peak load continuously. An highly undersized inverter AC in general is too bad for electricity consumption. Undersizing works well (for electricity consumption and not for cooling) only when you go for a non inverter AC.


Thanks abhishek for your response, I am from Pathankot(punjab).My room is 14*10*12 and gets direct sunlight on roof as well as ODU is also placed on roof.But mostly i am using AC in night. IDU also makes some tik-sound(only once at a time.... i feel perhaps when temp rises once it has achieved desired temp) It cools really really well.before purchasing AC i also used Your tonnage calculator.and After that i thought a 1.5 ton invertor AC ll be good enough.i am actually not getting reason for higher consuption as room size is not that big.what are your views about this model of Bluestar BI-5CNHW18PAFU.I purchased bluetar because there are many good reviews about bluestar

Abhishek Jain (Mod)

I used the calculator for the numbers you mentioned and it shows me 2 ton regular AC and 1.8 ton for inverter AC. Still with that it should not run at peak always because 2 ton requirement is only for peak summers day time. In monson season when the temperature is not really high, 1.5 ton should be fine. Somehow the AC is running at peak load. Is your room completely closed when you use the AC (I mean doors and windows)? Do you have too many things kept in the room? Do you have many appliances in the room like refrigerator, computers, etc. Are there too many people in the room (more than 4)? Can you check if the walls or windows are hot when the AC is on (you can touch and see if it is too hot)?


Thanks abhiksek for quick response.can u tell anythingg about the( tik )sound that comes sometimes and what are your views about bluestar as a brand for Quality and durability. and also please comment on this model what are your views??

Abhishek Jain (Mod)

Blue Star is a good brand. I feel that it is amongst the top brands from India. It should be durable.I do not see any problems in the specs of the model.


i had purchased videocon 1.5 ton split a.c. on 24th may 2016, it is five star rating a.c. 3 days ago one of copper pipe near compressor burst because a wire is touching to it and got shot. it was repaired by videocon by gas welding and gas is refilled in it.

but electric consumption after this increased..

my question is that does repair or gas filled affects the electric consumption.

are there are various quality of gas which is filled in.


Abhishek Jain (Mod)

There are various kinds of gases available. I am sure they would have filled the right one matching to the AC's requirement. But yes, refrigerant gas can certainly bring inefficiency in the system if it is not filled properly.


thanks Abhishek


Hi , can you tell how much electricity consumed by 0.5 ton A.C


My room size 14.4 ft long 11.4 ft width and 9.4 ft height. Which tone and type AC(Split or Inverter AC) Suitable for per day 10 hour service of 6 month a year.What amount would be the electricity bill.

Abhishek Jain (Mod)

Hi Ranajoy,

I would suggest that you use the calculator on this page: http://www.bijlibachao.com/top-ten-appliances/best-air-conditioner-ac-window-split-hitachi-lg-carrier-samsung-electricity-consumption-tonnage-in-india.html

It will help you in finding right size, star rating, type (inverter/non inverter) and will also help you with electricity bills.


Hello Experts! Greetings. I have a doubt regarding Inverter AC. How much is minimum and maximum power(watt) taken by an Inverter AC? I mean if a particular temperature is attained it will reduce its rpm(power). I need same for Hitachi RAU018HVEA Split AC 1.5 ton model. I hope Im posting correct question!? Thanks you in advance.

Abhishek Jain (Mod)

Hi Abhishek,

Hitachi RAU018HVEA is an old inverter AC model from Hitachi. I do not think Hitachi is selling it these days. The information for this model is not available on Hitachi's website. Every inverter AC has different minimum and maximum power. It will certainly reduce power consumption as it attains the right temperature.

Abhishek Varadkar

Thanks for info. Do you have data about Minimum power adn maximum power for LG BSA 18IBE 1.5 ton inverter AC? I tried finding on website they had only mentioned Cooling watts and not electrical power.
Thank you in advance.

Abhishek Jain (Mod)

HI Abhishek,

No we do not have that data. We also use manufacturers' website to get the data.


Hi Abhishek,
Love all the guidance you provide to everyone. Need some help with a setup. Summer is getting worse every year, and finally have decided to install ACs in my workshop, which is basically a tailoring unit. Its like a 36x14x12 room, split vertically into two levels 6ft height each by a mezzanine floor for about 3/4 of the length. First floor, no hot terrace, 14ft side faces East. Area to cool is about 12x14x12 + 24x14x6 + 16x14x6. Involves 10 sewing machines, 1 ironing table, 10 people working, as many tables and quite a bit of fabric lying around. To be used for approx 4-5 months in the year, about 8-9 hours per day. Showed to a few engineers, say need about 4 to 6 tons. Thinking of 3 units of DTKP60 (1.8T inverter Daikin). But here's the dilemma - I am not sure if inverter tech is good for such heavy duty setup.

1) Would I be looking at more maintenance cost vs a 4/5 star AC? And would these outweigh the power savings? There's surely going to be lots of fibers/threads floating in the air, which is going to choke the filters, but we can clean them weekly I guess. They say the cost of PCBs and gas is much more in inverter.
2) There's ceiling fans in the 12 ft height area ( blades at about 7-8ft height) and small wall fans in the 6ft height areas. Should I be looking at switching them off or keeping them on while using the ACs?
3) Would Daikin be more painful for maintenance vs some Indian company like Voltas?
4) Some people say since they started manufacturing in India, Daikin quality has gone down and people have been facing problems. Personally I feel quality should be as good as the imported lot. What is your view?
5) R32 used in Daikin vs R410A used by others, purely looking at cost of maintenance?
6) 1.8T DTKP commands a premium of about 4k over the FTKH which is 1.5k over the DTF60. Worth it?

Sorry for the many questions, I know this is not a home setup, but these engineers who visit aren't convincing at all.
Thanks & Regards,


Further to above, I am also considering if 3 units of 1.5T may suffice instead of 1.8T. Also to add, I am located in Mumbai.


I have purchased a Croma AC(Model no CRAC7489) couple of days ago. It is a 1.5 Ton 5 star AC. We live at Hyderabad in 2 nd floor of a four story building
Can you please tell the approx. power consumption in units/hr and tell some energy saving ideas to save power bill

Swathi Sankranthi

i have a question regaring power consumption of my lloyd ls19a3hr 1.5 ton 3 star rated ...we bought recently and i used for 1 month in it is cooling mode and i hv got 3000 rp electricity bill per month...
and i called to customer service regarding this they ask me to keep using in auto mode then we dont get that much billl..
here is my question is when i observed that compressor is on for 5 min n again restarts after 3 min and i kept temp for 27c is this power saving mode or else i need to take any care plz suggest..
and one more question is when in an auto mode i use ac for 5 hours how much power biii i can expect(eer is 3.17 cooling capacity 4960 power consumption 1566) plz suggest

Abhishek Jain (Mod)

Hi Swathi,

Keeping the temperature as high as possible for getting comfort is the best strategy to reduce electricity consumption. If 27 is comfortable, then it is good. If you AC is running for 5 mins in 8 mins then in an hour it would run for about 37-38 mins. If power consumption is 1566, then it would consume about 1.2 units in an hour. So in 5 hours it would consume 6 units (approx). In a month if you use it for 30 days, it would be 180 units. The cost will depend on the price of electricity in your city.


Hello Abhishek,

As suggested by you I have brought HITACHI DC Inverter 1.5 ton RAU518IWEA(Invetrer 5 star model)

Could you please resolve my below queries,Not sure whether below quiere are myth or truth but thought to get it to clarified from you:

1. Turning ON the AC consumes more energy?same like refrigerator, if we open door frequently then it consumes more energy.
Example : if my AC consumes 2 units for running an Hour then does it also consumes 2units when we turn on AC?

Note : 2Units are being used just as reference purposes. I am not sure how much energy it consumes.

2. Does using fan while AC is on cosumes more energy?

3. When we turn of the AC by using Automatic Timer then also AC consumes energy as main power supply of AC Is still on but Indoor Unit is off.

4. How do I find out how many units my model is consuming per hour (Hitachi RAU518IWEA)? is there any calculation or information which can provide me approximate statistics ?

5. Is there any Standard Operating Procedure by using which I can run my AC more efficienntly?
(on optimum energy consumption)

Thanks for helping me for buying good AC.

Pankaj Naik


Check this link -https://www.quora.com/How-much-electricity-units-is-used-by-1-5-ton-split-AC
Usually 1.5 ton AC consumes 1.5 unit per hour. It consumes power when AC is cooling that is when compressor is running. It is usually 20 mins per hour.

So you can calculate as per that. Also keep temperature 2-3 degrees below current temperature. Range of 26-28 degrees is good enough.

Abhishek Jain (Mod)


Here is my response:

1) The analogy used for opening closing refrigerator door to switching off AC is not correct. The equivalent analogy would be opening/closing the doors & windows of the room. Everytime you open the door/window, you let the hot air come in and the cold air go out, which increases the heat load inside the room (just like it increases the heat load inside the refrigerator). And this results in more electricity consumption. An AC does consume more power when it starts up, but then the duration of more power consumption is quite less. Especially in case of inverter AC, it should stabilize the temperature in 15 mins. But if you switch it off for 2 hours, it is essentially using no electricity for 2 hours! Which is better than high power consumption for just 10-15 mins. Only if you switch it off for just 30-40 mins will it be bad from electricity consumption point of view (even in that case if your thermal insulation of the room is good, it may not be as bad).

2) Using a Fan allows you to increase the temperature on your AC. The air flow around the body makes you feel cold and if with that you can increase the temperature on your AC from 24 to 26, you save a lot of electricity. But if you keep the AC at 24 in both the situations, then you are not saving any electricity (but instead increasing electricity consumption). Also if the ceiling of the room is hot (exposed to sun), then it may not be a good idea to use ceiling fan (better use pedestal fan in that case) as it would throw hot air down and increase electricity consumption of AC. If your room does not have ceiling exposed to sun, then you can use ceiling fan (and yes increase the temperature!).

3) Standby power (or electricity consumption of appliance when kept on from power supply but not in use) of Split ACs is quite less (about 0.5 Watts or less). The electricity consumption will be minuscule, but yes, there will be some electricity consumption.

4) As per BEE data Hitachi KASHIKOI 5300I (RAU518IWEA) has electricity consumption of 868 units in 1600 hrs of use. So roughly 0.5 units in an hour.

5) Well most important thing is to keep temperature as high as possible to maintain the room as per your comfort. A temperature of 25 and above is good. Keep the doors and windows closed while using the AC. Use thick curtains to avoid sunlight come into the room. Do not stuff the room with too many things/appliances.


Thanks. Nice explanation. Specially the point 2, I have been thinking about it for quite some time.


Hello Abhishek,

Thanks for wonderful explanation again!!!
Keep doing great work.

Pankaj Naik.


Sir, I just wanted to add one more comment, like for Whirlpool 3DCOOL XTREME HD 5S (1.5 T) I would have brought it already but FLIPKART (Lowest Price 33990 but doesn't deliver to my pincode) and local stores 38K (a 4K difference) which is what also made me to hold on the decision for a while but now since summer in my region is just picking up need to get this done, do you think its worth paying 4K more? or just forget this beautiful looking feature loaded AC and get either Voltas 183V IY or Lloyd LS18VI confusion hi confusion he.


Hello, can u pls help me with this ASAP
I want to purchase wine red blue star ac model but shopkeeper is saying that red ac will take 10 min more than white ac to cool a room..!! Is it true or not..!!
Btw i heard it first time

Abhishek Jain (Mod)

I do not think red color ac should impact cooling of the room. Although red absorbs more heat in general as compared to white, but I do not see any reason why it should increase the time taken to cool the room by 10 mins.

Load more

Send this to a friend