Electricity Saving Tips For Homes And Offices

Things that impact electricity consumption in air conditioners

By on April 27, 2016
Hindi Translation: एयर कंडीशनर में बिजली की खपत को प्रभावित करने वाले प्रमुख कारक

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

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  • Anees

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

    • https://www.bijlibachao.com Abhishek Jain

      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.

    • Anees

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

    • https://www.bijlibachao.com Abhishek Jain

      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 )

  • Imtiyaaz Basheer

    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…

    • https://www.bijlibachao.com Abhishek Jain

      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.

    • Imtiyaaz Basheer

      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

  • Prashant Mane

    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.

    • https://www.bijlibachao.com Abhishek Jain

      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.

  • ankit sethi

    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.

    • https://www.bijlibachao.com Abhishek Jain

      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.

    • ankit sethi

      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?


    • https://www.bijlibachao.com Abhishek Jain

      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.

    • ankit sethi

      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.

  • https://www.bijlibachao.com Abhishek Jain
    • Ajay Patel

      Pls. Give any 1 name for 1 ton inverter ac

    • https://www.bijlibachao.com Abhishek Jain

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

    • Ajay Patel

      Thanks sirji

  • Ajay Patel

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

    • https://www.bijlibachao.com Abhishek Jain

      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.

    • Ajay Patel

      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

    • https://www.bijlibachao.com Abhishek Jain

      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

  • realdeal160

    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.

    • https://www.bijlibachao.com Abhishek Jain

      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.

    • realdeal160

      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

    • https://www.bijlibachao.com Abhishek Jain

      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.

  • Suraj Atray

    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.

  • Priya Gautam

    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.

    • https://www.bijlibachao.com Abhishek Jain

      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:

  • Kishore

    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

    • https://www.bijlibachao.com Abhishek Jain

      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.

  • Priya Gautam

    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 [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.

    • https://www.bijlibachao.com Abhishek Jain

      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.

  • amit mahajan

    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.

    • https://www.bijlibachao.com Abhishek Jain

      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.

    • amit mahajan

      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

    • https://www.bijlibachao.com Abhishek Jain

      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.

    • Ravi Raj

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

    • https://www.bijlibachao.com Abhishek Jain

      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

  • Rashpal Singh

    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.

    • https://www.bijlibachao.com Abhishek Jain

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

    • Rashpal Singh

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

    • https://www.bijlibachao.com Abhishek Jain

      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.

  • Chaku

    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?

  • Shoeb khan

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

    • https://www.bijlibachao.com Abhishek Jain

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

  • Pankaj Naik

    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.

  • Amit Mahajan

    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

    • https://www.bijlibachao.com Abhishek Jain

      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.

    • amit mahajan

      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

    • https://www.bijlibachao.com Abhishek Jain

      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)?

    • amit mahajan

      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??

    • https://www.bijlibachao.com Abhishek Jain

      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.


    • https://www.bijlibachao.com Abhishek Jain

      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

  • Sahil Montu

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

  • Ranajoy Das

    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

    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.

    • https://www.bijlibachao.com Abhishek Jain

      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.

    • https://www.bijlibachao.com Abhishek Jain

      HI Abhishek,

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

  • Kunal Agrawal

    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,

    • Kunal Agrawal

      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.

  • 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

    • https://www.bijlibachao.com Abhishek Jain

      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.

  • Pankaj Naik

    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

    • humanusa

      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.

    • https://www.bijlibachao.com Abhishek Jain


      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.

    • Vatsal Singh

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

    • Pankaj Naik

      Hello Abhishek,

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

      Pankaj Naik.

  • Rajesh

    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.

  • dhaval

    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

    • https://www.bijlibachao.com Abhishek Jain

      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.

  • Priya Gautam

    Hello Mr. expert, Greeting and good day to you !Being a hard core environmentalist it’s better to take expert views for making wise bye as we all know that installation of an air conditioner is a long term investment in all covering aspect.I am the local resident of Patna bihar,and i have to get installed an inverter technology based split AC for 13×10 square feet room.I have gone through all theoretical aspects of AC. But still remain uncleared about the brand.Ideally Ac will be operated for max 6-hrs in a day during sunny days.And if possible also suggest Model number.

    • https://www.bijlibachao.com Abhishek Jain

      Hi Priya,

      A few things are very important while buying an AC: 1) The right size (because undersized AC will not cool and oversized will consume a lot of electricity if you are going for a non-inverter technology AC). 2) Right Star rating (energy efficiency of AC drives your electricity bills, although more energy efficient models are costly but then you recover the cost in electricity savings).

      Right size depends on: city where you are in, size of the room, location of the room (if it gets sunlight on walls/ceiling) and number of people.

      Rige Star Rating depend on: Your annual electricity usage and cost of electricity in your city.

      We have incorporated all these factors and have created a calculator on this page for people to analyze right size, star rating and costs of electricity based on the city you are in: https://www.bijlibachao.com/top-ten-appliances/best-air-conditioner-ac-window-split-hitachi-lg-carrier-samsung-electricity-consumption-tonnage-in-india.html

      From your room size, my guess is that it would need a 1.5 ton inverter AC (you may confirm it using the calculator). On the same page we also have FAQs for buying an AC and FAQ no 9 is “Which brand is good?” and the answer we have written is:

      This is the most common question we get which is most difficult to answer. We have tried to answer this on our link: Which is the best brand to buy?. A lot of it is perception based on experience. However these are the brands that you will most likely find in our recommendations: Daikin, Hitachi, Sharp, Panasonic, General, Mitsubishi, Carrier, Blue Star, LG, Voltas, Samsung, Godrej. Not that other companies are bad, but these are top most. The only brands that we do not recommend to buy are the brands that used to be retailers and now have started selling ACs under their own brand names.

      We have also listed the top most efficient ACs on the same link (which includes the model numbers).

  • Ankur


    Need a window AC.
    City: Mumbai
    Floor: 6th
    Total floors: 7
    Room size: 15 feet by 11 feet
    Ceiling height: 9 feet
    Window: French window of L10 feet and H6 feet
    Occupancy: 3 Adults
    Time of use in summers: 10 hours

    Please suggest tonnage and company for window AC



    Hello …. could you please guide me in buying an inverter split ac 1.5 ton in terms of :
    1. COOLING


    • https://www.bijlibachao.com Abhishek Jain

      HI Aditya,

      You may go for O General ASGA18JCC or Daikin FTKP. Both are good models. Pros of General are that they are quite robust and heavy duty ACs. Rock solid on durability. But then not every model they have is energy efficient (they consistently lack on that aspect). And you may also check for their service support in your city before making a purchase.

  • Rajesh

    Hello Abhishek Sir, just due to non-availability of AC from online Retailers I have to explore few more models,

    Can you please please suggest which one to chose from below as LG Inverter one is very costly,

    Whirlpool Fantasia 1.5 Ton Inverter AC

    Voltas 183V IY 1.5 Ton Inverter AC

    Voltas 1.5 Inverter AC 18V DY Inverter AC

    Voltas 1.5 Inverter AC 18V LY Inverter AC Air Conditioner
    read some reviews and some says old models some says very good etc. is confusing me big time
    while I found Whirlpool to be of Highest SEER and many features so if you recommend Whirlpool to be a good AC then would like to go for Whirlpool else Voltas but please recommend model.
    Thank you so much.

    • https://www.bijlibachao.com Abhishek Jain

      There is a difference between EER, SEER and ISEER. EER is energy efficiency ratio which is an instantaneous number. It is ratio of output the AC gives at any time by power consumed. Non-inverter ACs have fixed output and fixed input and thus calculation of EER is possible.

      With inverter ACs the output and input both vary and thus calculation of EER is not possible. For this various countries adopt SEER or seasonal energy efficiency ratio. SEER is calculated by analyzing seasonal temperature variations and output/input of an AC in various conditions.

      Now as every country has a different climatic pattern, SEER will vary from one country to another. BEE in India has adopted ISEER (or Indian SEER). Many brands have got BEE star rating for their inverter ACs by getting rated on ISEER.

      But this Whirlpool AC is NOT rated by BEE yet. They do quote SEER number on their website (which is 5.6 as you have noted), but there is information as to which country’s SEER is that. Is it from US, Europe or Japan. As there is no clarity, we have not included it in our list as we cannot compare it with other ACs. Also please note SEER numbers are in general higher than EER numbers.

      Whirlpool otherwise is a decent brand. Just that we do not have any clarity regarding this model.

      Amongst the voltas models, Voltas 183V IY 1.5 Ton Inverter AC is a BEE 3 star rated model and latest model (other two are old models). You can go for Voltas 183V IY 1.5 Ton Inverter AC.

  • Rajesh

    Hello Sir, past week I have been thinking to buy an AC but lot of confusion, hope you can help,

    Initially after reading about ACs comparing STAR Rated and Inverter ACs I short listed 3 Models

    1. Voltas 12V DYA 1 Ton Inverter Split AC (Approx.. 32K) Hot and Cold Feature (not sure if its hot and cold but reading specs suggests its hot and cold)

    2. LG 1 Ton BSN12IMA INVERTER Split Ac (Approx. 37-38K) Cooling Only (Many Features like Mosquito Away and Himalaya Cool etc.)

    3. Sharp AH-X15RHT 1.25T (didn’t find price online so will check on that from local stores) Cooling Only (Many Features like Plasma Air Purifier etc.)
    So can you please suggest which one is the right model considering features and price point? would be of great help.
    Not sure which brand provider proper after sales service for my location (Dungarpur, Rajasthan) sending email to all brands but no one seems to be replying so far except LG which replied but without answering my questions.
    biggest problem is am abroad and have to buy this AC back home where there is no one who can go to stores and find prices to compare from online,
    Please suggest since things have improved bit is it ok to buy online? as for Sharp suggest on their site clearly if brought from snapdeal no warranty and support from them but none of the brands have this clauses for online purchase so what is your opinion? and can you please suggest best retailer to buy Sharp from?
    Thank you so much, your answer will help me make this purchase.

    • https://www.bijlibachao.com Abhishek Jain

      Considering you need an AC for a small place, Voltas and LG are much safer as compared to Sharp as far as service is concerned. Between the Voltas and LG models that you have listed, LG has better energy efficiency. Also LG can work well in Rajasthan. So I think LG sounds like a good choice amongst the models that you have listed.

      You can certainly buy online, but make sure that you buy either from Amazon or Flipkart. And even over there, make sure that the seller has good ratings (in case of Flipkart, WS Retail which is flipkart’s internal seller, would be a good choice).

    • Rajesh

      Hello Sir, Thank you for the response, its all clear that I will be going either for Voltas or LG, but another problem is none of the online retailer you mentioned deliver large appliances to my pincode, only Snapdeal and Infibeam deliver to my pincode so how to go about that? my room is not small its (12*14*10) but its ground floor room of a double storey house, and no direct sunlight due to surrounding houses so I thought 1Ton should be enough.

      Have you looked into new Videocon “ARYABOT” ?

    • https://www.bijlibachao.com Abhishek Jain

      For getting the right size, I would suggest you to look at 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

      I do know about Videocon Aryabot, but I would still suggest going for Voltas or LG.

  • Pankaj Naik

    Hello, This is really wonderful explanation !! I would like to buy 1.5 ton… Please suggest which one i should go for from below models:

    Purpose : Home Use

    My usage Pattern is as below :

    All Days : 6 Hours in Night for 5 to 6 months
    Weekends : 4 Hours in Afternoon
    Total Usage in week : 50 Hours in week for 5 to 6 months

    Shortlisted models are as below :

    1. Hitachi 1.5 Ton Inverter+5 Star AC Model – RAU518AWEA ( I clean Technology, 2016 Year Model)
    2. Mitsubishi SRK18YLS 1.5 Ton Inverter

    Query :
    1. Please let me know should i go ahead with Inverter technology or Normal 5 Star Rated AC? ( Its for home use)
    2. If i should go for Normal 5 Star Rated model then would you please recommend me any model in Hitachi or Mitsubishi?
    3. Which brand is better Hitachi or Mitsubishi(Heavy/Electric)?
    4. If i buy Inverter AC then would it cost me higher in case of breakdown(i guess yes) but this cost is still lower than my electricity bill which i have saved till now because of Inverter AC then still its ok with me, Please advice.

    Notes :
    1. Budget is not an issue for me ( Its around 55,000 Rs)
    2. I want good reliable AC which will be less on maintenance and electricity bill
    3. I would like to buy AC as soon as possible , probably just waiting for feedback from your side

    I would appreciate if you can provide me your expert comments point by point.

    Pankaj Naik,

    • https://www.bijlibachao.com Abhishek Jain

      Hello Mr Naik,

      Here is my response:

      For Query 1: I would suggest that you use the calculator on this link to evaluate the electricity costs of BEE 3 star, 5 star and inverter. The calculator taken in inputs from you on your usage, and room location. It has inbuilt tariffs in various cities and it suggest tonnage, star rating and cost of electricity. That can help you decide if you want to go for BEE 5 star or inverter. Calculator link: https://www.bijlibachao.com/top-ten-appliances/best-air-conditioner-ac-window-split-hitachi-lg-carrier-samsung-electricity-consumption-tonnage-in-india.html

      For Query 2: All depends on your budget. My suggestions are always based on decent brand and energy efficiency. If I have to suggest anything I will suggest you the one that has higher EER (or energy efficiency ratio) in Hitachi and MItsubishi. As brand wise both are good and EER will be my only parameter for suggestion. Again top most efficient models are listed 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

      For Query 3: All the brands you have mentioned are good brands. It is like asking which car is better honda or toyota :). Difficult to answer.

      For Query 4: Inverter ACs have costly PCBs (electronic components). Till now I have seen only two ways they can get damaged: 1) Due to Power Surge 2) Due to corrosion. Brands are providing corrosion protection for PCBs. You need to make sure that you prevent them from power surge. Power surge can be caused due to short circuits, lightning, etc.

      Note: Have got a few complaints on hitachi service (in some cities). And Mitsubishi has lower eer numbers as compared to Hitachi. Both have good make.

    • Pankaj Naik

      Hello Mr. Jain,

      Thanks for your quick and such detailed information.. Really amazed me.

      I have checked calculator for EER and it shows i can go for 5 Star ratings.

      But looking at less cost difference between 5 Star and Inverter i am thinking to going ahead with Inverter one(One time spending 60,000 Rs is fine with me rather than spending on electricity bill), provided it doesn’t land up with high maintenance in future (I know no one can predict that when system will be having break down).

      Could you please recommend me which model you will recommend me from below 4?

      1. Hitachi KASHIKOI 5300I (RAU518IWEA) – I Clean Technology
      2. Hitachi KASHIKOI 5400I (RAU518CWEA)
      3. Hitachi RAU520MWD
      4. Hitachi RAU520AVD

      5. Could you please provide ratings based on Quality for below 3 companies?
      Hitachi , Mitsubishi Electric , Mistubishi Heavy , O General (Quite confused which one should i buy Hitachi or Mitubishi Heavy/Elec)

      6. I have seen that O General Inverter 5 Start is more costly than Hitachi , but EER is less than Hitachi.

      Pankaj Naik.

      Pankaj Naik.

    • https://www.bijlibachao.com Abhishek Jain

      Here is my response:

      For model: Hitachi Kahikoi 5400i and 5300i are the most energy efficient models with 5400i being the best.

      For Brand: All the brands you have listed are top notch Japanese brands. All are quite reliable. You can go for anyone of them.

      For price difference: Hitachi and some other Japanese brands have started assembling in India. General mostly is imported. And that is why the price difference. Some people feel that India made models are not reliable (sad for Make in India :) ), but I do not believe so. I think they are good. But it is your choice.

      I would go for the most energy efficient model in this case. Just make sure that the brand has good service in your area (whichever brand you choose).

    • Pankaj Naik

      Hello Abhishek,

      Thanks for your inputs. Brought “Hitachi KASHIKOI 5300I (RAU518IWEA) ” and very happy with performance as of now.

      However, would like to buy another AC but this time from Mitsubishi (Elec/Heavy) and 5 Star.

      My Requirement:
      1. Brand : Mitsubishi (Heavy / Electric?) which one is better
      2. Ton : 1.5
      3. Start : 5 Star
      4. Could you please suggest me best from either of this company which will be lower of maintenance but higher on Energy Saving?
      5. Still should i go ahead with another 5 Star from Hitachi?(Budget is not an issue)

      Based on calculator which you have provided its recommended to buy 5 Star for my usage.

      Thanks in advance for your valuable suggestion.

      Pankaj Naik

    • https://www.bijlibachao.com Abhishek Jain

      Both MHI and ME are good companies. MHI models are a bit more heavy duty kind. Energy Efficiency wise both have models that are good. Hitachi models, however, have higher EER than both MHI and ME. You can go for MHI model, it would be good.

    • Pankaj Naik

      Hello Abhishek,

      Thanks for quick response Abhishek !!!

      It would be great if you can provide below details:

      1> 1 model from each brand MHI , ME and HItachi in 5 Star , 1.5 Ton.
      2> When we use Inverter / 5 Star Model how many units it consumes per hour , assuming i am running AC on Cooling mode of 22 Temp?
      (This will help me to find out how much time it will take to recover my invested cost of Inverter)

      Pankaj Naik.

    • https://www.bijlibachao.com Abhishek Jain

      Hello Mr Naik,

      Here is my response:

      1) For the model I would suggest that you look at the list on this link: https://www.bijlibachao.com/research/list-air-conditioners-available-indian-market.html

      2) Again for point no 2, I would suggest that you try using the calculator on this link: https://www.bijlibachao.com/top-ten-appliances/best-air-conditioner-ac-window-split-hitachi-lg-carrier-samsung-electricity-consumption-tonnage-in-india.html …. the calculator will suggest you approx cost of running different types of ACs.

  • babu

    from erode tamilnadu, 11ft*11ft*10ft, one wall direct sunlight from 2-6.30pm, topfloor, room is very hot on summer day and night, summer temp is 99-105F, 1 or 1.5 ton inverter ac