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Electricity Saving Tips For Homes And Offices

Ideal Air Conditioner temperature for electricity savings

By on April 22, 2016
Hindi Translation: बिजली बचत के लिए आदर्श एयर कंडीशनर तापमान

Buying an air conditioner once considered a sign of luxury, is now becoming quite common in India. Many urban homes are equipped with air conditioners in one or more rooms. But everyone who owns an air conditioner knows that it comes at the cost of increasing electricity bills. Although cooling does take a lot of electricity but taking effective steps can surely get it down. One of the main things that can help is maintaining the right temperature for the air conditioners.

Air Conditioner Temperature

How does an air conditioner work?

For most people, air conditioner just throws cool air at the temperature one sets it at. But does it really work that way? In fact air conditioner during cooling process, takes the indoor air, cools it  by passing it through evaporator coil and throws it back in the room. It is quite opposite to how our good old air coolers used to work. Air coolers used to take outside air, cool it with water and throw it in. But air conditioners just work on internal air.

How does the thermostat work?

If you set the thermostat at 18oC (64.5oF), does it mean that the air conditioner will cool the room faster than if set at 25o(77oF)? No. The thermostat just checks the temperature of the air inside the room and stops the compressor when the temperature reaches the desired level. This means that the compressor will work longer if the temperature is set to a lower level, i.e it will work more and use more electricity if temperature is set to 18oC (64.5oF) than if it is set to 25oC (77oF). This is because it will take less time for air to reach to 25oC (77oF) than 18oC (64.5oF) as the compressor is working with the same power or wattage.

What happens when the compressor stops?

The air conditioner just blows the fan when the compressor stops and thermostat reaches the desired temperature level. At this stage the electricity consumption is only for the fan which is running and not for the compressor. The compressor will start again when the thermostat detects that the temperature has increased again from the levels that are set. Compressor is the most electricity consuming component of an air conditioner.

What factors impacts electricity consumption of Air Conditioner?

There are 4 factors that influence the electricity load:

1) Indoor air temperature

2) Outdoor temperature

3) Thermal insulation of the room

4) Temperature setting of the air conditioner.

If the difference between temperature desired and indoor/outdoor temperature is huge, then the air conditioner will need lot more electricity to cool the indoor air to desired temperature as the compressor will run for longer duration. If the temperature is set at 18oC (64.5oF) and the outdoor temperature is 38oC (100oF) then the electricity required will be lot more than when thermostat temperature is 24oC (75oF) and outdoor temperature is 38oC (100oF). As per study by ACEEE (American Council of Energy Efficiency Economy), increase of each oC can save 3-5% of units consumed. This can considerably bring down the units consumed per month in the electricity bill.

What is the ideal temperature that should be set on thermostat?

Having said that, increase in temperature does not reduce the comfort level. In fact as per ASHRAE (American Society of Heating, Refrigerating and Air-Conditioning Engineers), the ideal temperature for thermal comfort is between 23.5oC (74.3oF) and 25.5oC (78oF) in summers (depends on several factors as listed on wikipedia). Thus setting the temperature to 24oC (75.2oF) saves on electricity bill and provides good comfort. Using ceiling fans along with air conditioners can additionally help in increasing the thermostat temperature.Air Conditioner Temperature Infographic

Does “Quick Cool” option in Air Conditioners help?

Setting an air conditioner to quick cool sets it’s temperature to 18 or 16 oC (64.4oF or 60.8oF. This means that the compressor stops only when indoor temperature reaches this level. But while coming down from 35 or 40 oC (95oF or 104oF) it would have surely crossed 24oC (75.2oF) which is a comfortable temperature. So using “Quick Cool” option does not help because more electricity is used to get the temperature down to 18oC (64.5oF) whereas compressor would have stopped in between if the temperature was set to 24oC (75.2oF) thereby consuming less electricity.

How do old air conditioners without thermostat work? 

Old air conditioners without thermostat have high, medium and low cool options. As we learnt earlier that compressors of air conditioners work in binary mode (either they are on or off), an air conditioner without thermostat does not control air temperature. The high, medium and low options just changes the air conditioner fan speed. High means that air conditioner will throw more air and low means that the fan speed will be slow. The options do not change the temperature of the room, nor do they change the electricity consumption.

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


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  • charleeCortes

    Hi.. I have a few question!! #1 my window unit reaches 25C 10-12 min after compressor shuts off then it powers back on within 3-5 minutes i live in Honduras right now and the temp out side reaches to 100Fer.. so when the compressor shuts off it doesn’t take long for it to cut back on. So my question is, is that ok or should it stay off longer? #2 A few people told me the less the compressor shuts off and on the better because every time it cuts on and off it consumes more energy. Is that true? Also I have a mimi split in the living room so #3 is it better to cut the split completely off when im not home or put it on 29C so that the compressor wont cut on until I lower the temp? Im so lost with these units because im used to CENTRAL AC UNITS. :-( .. my units do come with a timer for start up time and cut off time as well. WHAT CAN I DO TO SAVE ENERGY

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

      I would say two things:

      1) Ideal running time for an AC compressor is 9 mins, which is when it attains efficiency. But if it runs all the time, it will consume a lot of electricity, and AC compressors are meant to turn on and off.

      2) It should not have a very short cycle. I mean it should not turn off-on-off in less than 3 mins. If that happens, then it is bad for the compressor. But if it happens in 5 mins, that should be fine. But ideal time is 9 mins. AC compressor should run for 9-10 mins, then turn off, then again start after a few mins.

      3) It is always better to shut the AC down when you are not using it. That will save a lot of electricity.

    • charleeCortes

      See that’s were I get confused is it short cycling ? It stays running 10-13 min the shuts off for about 3-4 minutes then repeats I heard that’s bad yet I live in a hot humid country so I’m not sure I heard that the more it cycle back on it cost more I’m not sure anymore some say it’s better if it runs 20 min n cuts off 20 min but in these countries it’s so hot that it’ll reach heigh temps quick this making compressor cut on within 3-4 min

  • charleeCortes

    Hi.. I have a few question!! #1 my window unit reaches 25C 10-12 min after compressor shuts off then it powers back on within 3-5 minutes i live in Honduras right now and the temp out side reaches to 100Fer.. so when the compressor shuts off it doesn’t take long for it to cut back on. So my question is, is that ok or should it stay off longer? #2 A few people told me the less the compressor shuts off and on the better because every time it cuts on and off it consumes more energy. Is that true? Also I have a mimi split in the living room so #3 is it better to cut the split completely off when im not home or put it on 29C so that the compressor wont cut on until I lower the temp? Im so lost with these units because im used to CENTRAL AC UNITS. :-( .. my units do come with a timer for start up time and cut off time as well. WHAT CAN I DO TO SAVE ENERGY

  • Syed Faheem

    Hi Abhishek,

    Appreciate your reply in my case.

    I run a library with 2 rooms equipped with AC, running for more than 12 hrs/day each.

    I set the temp mode to Auto or 24c but the students with their mobile apps change it 16 or 18c. Because of this, I am getting a big fat electricity bill every month.

    How do I fix this issue?

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

      Hi Faheem,

      I don’t think there is an automated way to control it. You will have to stop the students from changing the temperature. How are they changing temperature using mobile app?

  • saumil

    Ideal temp range for ac is 24-26 so what if we keep it at 30??
    Please explain

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

      If you feel comfortable, then you MUST keep it at 30, because you will save a lot of electricity if you do that.

    • GODDAMN Batman!!

      It will consume far less power.
      If the outside temperature is about 35, and you set the thermostat at 30, your AC just has to reduce the temp by 5 degrees. For reducing to 25, it would have to cool by 10 degrees. So less work consumed when set at 30.

    • saumil

      Thnk u

  • Jagdeep

    Hi abhishek my room size is 10*10 daily use is 8 hrs for 5 months . Which one is better in term of after sale service and durability. 1 voltas 125 CYE 1 ton 5 star . 2 Lloyd LS13A5Lx 1 ton

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

      However, from energy efficiency or EER perspective Lloyd model that you have listed has EER of 3.63 while the voltas model has EER of 3.6. But the difference is too small. So there is not much difference from that side.

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

      I would not say that Lloyd is a bad brand, but my personal preference would be for Voltas because I trust Tata group companies. And in general Voltas makes good ACs.

  • pankaj

    Hey Abhishek,
    Running AC on econy mode helps to save electricity can you please also elaborate what is econo mode if i run my ac on econy mode would it effect life of ac if i run it always on econy mode i have daikin inveter DTKP50 model
    Thanks

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

      Hi Pankaj,

      The econo mode of Daikin is explained well on this link: http://www.daikinme.com/minisite/nexura/energy-efficient.jsp

      it just reduces the maximum operating current in econo mode. It is also explained well on this link: http://www.manualslib.com/manual/685027/Daikin-Ftxs30hvju.html?page=27

      All I can say is that typically an inverter AC, when it is started, runs at peak capacity (of 120%) to cool the room fast and then it stabilizes. But in econo mode, it will start at lesser capacity, take some more time to cool the room (it will not be fast), but will not consume more current in the begining.

  • Prajeet

    Does keeping the temperature setting of an 1.5ton airconditioner at 29 degree celsius really save units consumed vis-a-vis 25 degree celsius? Pls advise.

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

      It will certainly save you a lot. To give you an example …. if outdoor temperature is 29 and you keep indoor at 29 …. the compressor will not work at all …. because there is no heat to remove to actually bring temperature down …. but then in the same situation if you keep it at 25 …. the compressor will have to work because it has to bring down the temperature by 4 degrees …… the amount of work a compressor does depends directly on the temperature difference it has to achieve.

  • Jigar Patel

    Hi abhishek
    I m Jigar Patel from surat, gujarat.
    I just buy Lyod 1.5 ton 3 star ac Ls19a3fx with power consumption 1572
    MY room size about 160 sq.ft. and on top floor
    Outer unit fixed at terrace, inner unit fixed on east wall of my room. South side most of wall of my room is covers glass slider wall with curtain.
    Is my ac is enough for that situation.?
    What is best operating mode to run at night?

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

      Hi Jigar,

      My guess is that 1.5 ton AC is slight undersized for your room, especially during the day time. At night it should be sufficient. Also if you keep the outdoor unit on top of the terrace, direct sunlight will reduce its effectiveness. So all in all, during the day it will be less effective. At night it should be fine.

      As for best mode of operation, it depends on what is comfortable for you. Try to keep the temperature as high as is comfortable to save electricity. Because your ceiling is directly facing sun during the day, using ceiling fan may not be very effective. Try to use it in sleep mode or economy (energy saver) mode.

  • Soumen Sadhukhan

    Hi Abhishek da

    I perches 1.5 ton lloyd 3star ac(LS19A3DX). If i run this ac regular 5hr per day. which amount of bill i aspect end of the month ?

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

      Hi Soumen,

      A BEE 3 star rated 1.5 ton AC should add about 1.3 units per hour of running. So in 5 hours it would consume 6-7 units per day.

    • Soumen Sadhukhan

      Thanks abhishek da….. :)

    • Soumen Sadhukhan

      LS19A3DX model is good? what you think?

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

      Lloyd is a decent brand and this is BEE 3 star rated model. No reason to say anything bad about it.

  • mukti nath

    I brought whirlpool 3dhool hd 1.5 tn 3 star ac. Day time it cconsuming more then 3 unit in 1 hour.is it ok.

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

      3 units in 1 hour is bad.

  • rafeeq

    Hi abhishek

    I recently bought an o general 2 ton ac.which consumes about 2.5 units per hour .is it normal or not.please suggest me method which I can reduce the power consumption
    By the way I set the ideal temp also 25°c it won’t works .

    • Deepak

      Just see the wattage of your AC. My AC is 1 ton and has power wattage of 1032 watts. It means it will consume 1.032 units in 1 hour. 1 unit is 1000 kilo watt hour.

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

      It does not work as straightforward as that unfortunately.

      AC has several components: Compressor, Fan, other electronics. The power consumption mentioned on the AC is sum of peak power consumption of all these components. But then compressor goes on/off (in case of non inverter AC) or reduces speed (in case of inverter AC). Even the fan speed varies and the consumption of fan varies with that.

      So it does not consume 1032 watts for the full time.

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

      2.5 units per hour is quite on a higher side. My guess is that the AC is not very energy efficient. You may try some of the insulation techniques given on this website: https://www.bijlibachao.com/save-electricity/insulation

    • rafeeq

      Its wattage is 2480

    • rafeeq

      Yeah it’s right the EER is 2.91.

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

      EER of 2.91 is really low. It would consume lot of electricity.

  • Mike

    Thanks for your reply, but i need clarification on this:

    1. when there is power failure it takes 3-4 minutes for the outdoor unit to start operation when power is restored.

    2. In case it was powered OFF then ON from the remote control it takes lesser time for the outdoor unit to start operation i.e. 5-10 seconds.

    What is the cause of the (2) time difference (power failure/remote control)?

    Kindly assist,

  • Naresh Kumar

    Hi Abhishesk

    I have recently purchased 1.5 LG Split ac model number LSA5AT3D1. I live in chennai on top floor and outdoor unit is installed on terras of my building. Room is completely closed and i am asking this as its been more than 3 hours ac is running and its not going lower than 24c (in night time)

    also i have seen that in remote provided by LG that my room temperature never touches lower than 24C even if set to 22 room size is 12.5*10 Feet.

    Hope to hear solution from you.

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

      Hello Mr Naresh Kumar,

      1.5 ton is the right sized AC for your room. It should certainly cool the room. How are you measuring the temperature of the room? It could be possible that the AC was not installed properly and it does not have sufficient gas pressure in it. Would suggest you to call a technician from LG to check the same.

    • Naresh Kumar

      Thanks for your reply Abhishek. Iam measuring the temperature of the room through LG AC remote. I have called technician from LG and checked the Gas pressure. It was 65 PSI. My doubt whether room temperature will reach equal to set temperature of AC or not and Remote is showing correct room temperature or not?

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

      65 PSI is on the lower side. If the outside temperature goes to 45 degrees then ideal PSI for R22 is 75 (Source: http://www.advantageengineering.com/fyi/289/advantageFYI289.php ). That could be one reason.

  • Mike

    Hi Abhishek,

    For compressor to be ON/OFF at regular interval based on the settings i.e. temperature @ 25. Does it have a side effect on the compressor?

    When AC is switched ON from the remote, the outdoor unit start operation faster within 5-10 secs. Is this normal for an AC? The brand is LG.

    Hope to hear from you.

    • Mike

      Thanks for your reply, but i need clarification on this:

      1. when there is power failure it takes 3-4 minutes for the outdoor unit to start operation when power is restored.

      2. In case it was powered OFF then ON from the remote control it takes lesser time for the outdoor unit to start operation i.e. 5-10 seconds.

      What is the cause of the (2) time difference (power failure/remote control)?

      Kindly assist,

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

      Hi Mike,

      ACs have a time delay system to prevent it from “Short Cycling” or frequent on/off. Ideal running time of an AC compressor is about 9-10 mins to attain peak efficiency. If the AC is oversized then this time goes down to say 3-4 mins as well. But then anything lower than that is surely detrimental for the AC compressor. And that is why a time delay is put in an AC to make sure that the AC does not short cycle in case of voltage fluctuation or power cuts. Not sure why it is not happening with remote control. It should happen for that as well.

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

      ON/OFF based fixed speed compressor does have lower efficiency due to ON/OFF, but then they are designed to work like that for 10-15 years. ACs for years have been working like that (only recently we have got inverter tech which does not gets on/off). And ACs have been working for 10-15 years for people.

      I do not see any anomaly in your AC.

  • Imtiyaaz

    Hi Abhishek Bhai,

    Thanks for being here, Your replies helped a lot in understanding measure to save electricity. I have few doubts with my New and first LG Smart Inverter AC Operation. LG Care was not able to answer my queries and i am left alone… Pls do help me in understanding..

    I set temp @ 28 and ran AC in Auto Mode. The AC is turning off even after reaching room temperature of 25. I dont know whether there is a set temp in automode or i have to set temp.

    I tried cooling mode again, the room temp reached 26 yet the outdoor unit is giving sound which means the compressor is running. So how will this autoshut works.

    Pls let me know one way of using ac in economy mode. Last night i set 28C and in auto mode for three hours it consumed around 4 – 5 units. I am afraid being a middle class.

    And last one when to use fan mode… I know these are silly and annoying questions but still i request you to share your wisdom so that i can save few units of electricity.

    Thanks in advance

    Dr Imtiyaaz

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

      Imtiyaaz Bhai,

      Fan mode is one in which compressor does not work. It is just the fan that works.

      As you have an inverter AC, it should not turn off after reaching the desired temperature. A regular fixed speed AC has on-off of compressor because it cannot vary its speed based on the cooling requirement. And that is where inverter ACs bring in efficiency as they do not turn off when the desired temperature is attained. It just slows down its speed. So sound would be more when compressor is running at a faster rate and less when it is running at a slower rate. But it should not shut down.

      It can shut down compressor only when outside temperature is 28 and you have set the temperature in indoor unit to 28. In that case there is nothing for the AC to do as the temperature outside and inside is the same and there is no heat to remove.

      But 4-5 min in 3 hours is a lot for inverter tech AC!! Did you keep the room open? Do not leave any doors or windows open when using AC. Also do you get direct sunlight on the room ceiling or walls during the day? In such cases getting a white roof or white wall can help you reduce electricity consumption.

    • Imtiyaaz

      Forgot to tel you about MY AC

      Its for 110sq feet room One ton LG Smart Dual Inverter 4star rating ac BSA12BEYD with 1050 watts.

      Will wait for your response bhai…

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

      This should not consume 4-5 units in 3 hours. Something is wrong somewhere.

  • Pingback: What Is Optimum Temperature For Air Conditioning – asksuite.top()

  • pankaj

    Hey Abhishesk

    I have recently purchased 1.5 daikin inverter ac model number DTKP50 i live in delhi on top floor i would like to know how much time does it take for the temperature to reach at 22 C if outside temperature is 42-44 . room is completely closed and best curtains are put inside the room i am asking this as its been more than 2 hours ac is running and its not going lower than 25 (in day time)

    also i have seen that my room temperature never touches lower than 25C even if set to 22 room is quite bigger in size which is 12.5*16.5

    Thanks

    • pankaj

      Dear Abhishek,
      Waiting for your reply
      Thanks

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

      Hi Pankaj,

      Firstly I would suggest that you check the calculator on this page to check if the size of the AC is right or not: http://www.bijlibachao.com/top-ten-appliances/best-air-conditioner-ac-window-split-hitachi-lg-carrier-samsung-electricity-consumption-tonnage-in-india.html

      An undersized AC will take a whole lot of time to cool the room. And sometimes it may not even cool to the desired temperature. Secondly it is also possible that the outdoor unit is directly facing the sun and thus is not able to work efficiently. Time taken to cool will depend on outside temperature, cooling capacity, heat load in the room ,etc.

    • pankaj

      Dear Abhishek,

      Thanks for the your reply.Can you suggest how can i protect outdoor unit from direct sun any cover or protector is available in the market also i would like to know since i live on the top floor thus fan put on ceiling make it more hot is it good to put a tower fan along with ac
      Thanks

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

      First thing that I feel is that your AC is undersized. That could be one major reason for undercooling.

      As for protector: there is none that I know of. You can try putting plant around it so that they can keep the environment cool. But basically there should be less heat around the outdoor unit to help it throw hot air outside.

    • pankaj

      Thanks Abhishek i called service engineer he did something now it takes 30-45 mins to reach at 25 C however i dont use fan it takes 5-6 unit(max) when i set it to 25C and i On it at 11 night and off it to 8:30 in the morning this 5-6 units include my fridge running for whole night and TV for 1 or 2 hour do you think its good consumption

      putting a tower fan with ac is a good idea please give ur opinion

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

      Daikin FTKP should consume about 0.7 units per hour (max). Which means in 9.5 hrs it should consume max 6.6 units. It is consuming much less than that (as heat load is low at night). Which I think is good. Because your fridge would also have consumed about a unit by that time. So Fridge + TV would be 1.2 units or so (max).

      I think it is consuming the right amount of electricity. You can certainly put tower fan if it helps you to increase the temperature from 25 to 26 or 27 without loosing comfort. If you still keep it at 25 with fan, then it does not help. It helps only if you are able to increase temperature of the AC.

    • pankaj

      Also it shows temperature of 24-23 sometime even if i have set it to 25 is it to worry about or this is normal behavior

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

      It tries to stabilizer, but slight up or down should be fine. 24 sounds fine, but 23 is a bit more. But as long as you are comfortable, I do not think you should worry.

    • pankaj

      Thanks Abhishek

  • Dhruba Dutta

    Hi Abhishek,
    I have Daikin inverter 1ton ac for my room which is around 140sqft. And my outdoor unit installed two floor above my room due to lack of provision.
    Now the ac is not reaching 25degree temp even after it is running for 1 hour, when room temp is around 35 degree.

    So what could be the issue and how to solve that?
    Please suggest.

    Thanks,
    Dhruba Dutta

  • Bhoboghure Jhor

    Hi

    I’m having a problem with my AC. O general 1.5 ton in 110 sqft room. My outdoor unit turns on 3 mins after first start if it is left for 1 day without run. But if I run it in regular interval then it takes 20-30 secs.
    Is it OK?
    Another thing is that now temp outside is 34-35 degree with humidity 55-60%
    Its taking 25-30 mins to make temp 25 degree. 1 hour to make 23.
    2 hours to make 20 in day time.
    Is it OK?
    Once you have told me a good AC should take 10 mins to make 25 degree…my AC is new….should I call for an engineer?

    TIA

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

      Oversized Ac should not take much time to cool. You should call an engineer.

  • Waruna

    Can you point me to a good energy meter to check the power consumption of my AC preferably from ebay?

  • http://www.wrock.org Sandeep Tanwar

    Hi Abhishek,

    Your website is very informative I have decided my specification but not able to decide which brand to choose from please suggest any brand name.
    I need 1.5 ton, Some my friends suggests me to go for O-general or Diekin
    So does it really matters if I go for other brands like LG, Whirlphool, Bluestar else any other because O-General ac are very expensive does they worth that price compare to low price brand in any way. And which brand you are using?

    I’m from Haryana and In summers some times temperature goes more than 45C. Please name any brand AC because now I don’t want to hear to choose myself and these all are best please name it.

    Thanks
    waiting for reply

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

      Hi Sandeep,

      While buying an AC, the first and most important thing to know is the right size or tonnage of AC to buy (which depends on the size of the room, etc). The next thing is to understand the right star rating (which depends on your usage of AC in hrs/year). Technology/brand etc are the 3rd important factors. I would suggest that you use the calculator and FAQs and the list of top efficient ACs given above on this page to evaluate the right thing. Once you have done that and you still have doubts, we will be happy to answer them.

      Also please do check this page where we have given our opinion on various brands: http://www.bijlibachao.com/general-tips/brand-analysis-which-is-the-best-brand-to-buy.html

    • http://www.wrock.org Sandeep Tanwar

      Actually this is not what i’m asking. They are just opinion but you haven’t give any recommendation that I should go for.
      Which AC should I choose Voltas vs LG vs Whirlpool vs Hitachi under 35k budget spit ac

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

      From what we have in our database, these are the most energy efficient models from your selected brands in 35K budget:

      Whirlpool 3D COOL PLT V (1.5 T)
      Voltas 185 JY
      Voltas 185 DYI
      Voltas 185 EY(S)
      Voltas 185 CYA

      Their details are in the image attached. You can also check our database on this page: http://www.bijlibachao.com/research/list-air-conditioners-available-indian-market.html

  • Barathi Raja Kirubanandham

    Hi Abhishek,

    I recently purchased Bluestar 1.5 Ton Split Ac for my 120 Sq.ft room whose roof gets direct sunlight.
    Suggest me best the mode of operation during nights. I live in Chennai.
    1. Running the AC in Auto mode full night. ( I’m afraid of power consumption in this method).
    2. Keeping in cool mode and switching the AC off and on in an interval of one or two hours (which disrupts the sleep).

    Thanks in advance for your suggestion.

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

      Minimum temperature that you should keep should be 25 degrees.If you can keep more (like 26-27) then it will be better.

      If you have energy saving mode in the AC then use that. It will automatically switch off the AC periodically.

      Try using sleep mode (if there is one). Sleep mode increases the temperature by a degree every hour or two. This helps in saving electricity.

      You can also consider finding timer switches in market that can be programmed to switch on and off AC periodically.

  • ajay

    Hello Abhishek,

    I have purchased 1.5T Inverter A.C. of Lloyed company. I am living in trivandrum where max. temp. varies from 33 to 35 degree.
    Which will consume less electricity; using AC continuously for longer hour by setting the temperature 28 or 29 degree with fan( which i am doing and i am comfortable in it) or setting the temperature 25 degree or lesser for shorter time and when room gets chilled, we can off it. Please tell me.
    with thanks

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

      Your current usage of 28-29 with fan will give you most energy saving. However I just hope your ceiling does not get direct sunlight. If it does then better avoid using fan. But if it does not, then your current mode is the best.

  • Bhoboghure Jhor

    Dear Mr. Abhishek Jain

    I have a question….I have discussed about my AC performance with you earlier….my OGeneral 1.5ton ASGA18AHT 1 star AC requires 35 mins to cool my 110 sqft room (undersized for AC) up to 21degree….and 1 hour to make 19 degree when it is 30 degree outside…..As you have said the time is OK….but one of my relative have 1.5 ton Jadroo AC in his 160 sqft room it takes 40 mins to make 21 degree….seems faster than my one….but my one is brand new and of good brand….location and other factors are almost same….one thing I noticed is that…..my outdoor is placed in a balcony where the opposite wall is only 3 ft away from my outdoor units fan….so a considerable amount of hot air bounces back to unit….is it causing the slowness in performance…what should be the ideal distance to make it working perfectly?
    Thanks in advance…..

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

      Hi,

      Heat on the outdoor unit can impact the cooling of the AC. It could be the reason why it is not cooling quickly. I would suggest that you call service engineer from General and get it checked.

      Regards,
      Abhishek

  • firoz basha

    Hi sir we bought a new lg air conditioner with mosquito away technology 1.5 ton and 5 star rating our room temparature is not getting below 25 even i gave the input to 18 . What might be the reason for it??

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

      A right sized AC should be able to get your room temperature to 25 quickly, but 18 is really really low and it will take quite some time to get it down to 18. However 25 is quite cold and comfortable. You will have to leave it on for more than an hour to get it down below 25 and 18 will take really long time. You will have to significantly oversize the AC (as per the requirement of your room) to get it to 18 really quickly.

  • prk

    Hi sir, I am buying a new AC, I don’t know exact dimensions of my bedroom, but it is a bedroom in normal 2 BHK homes. Some people in my building have 1 Ton AC. Will it be better if I go for a 1.2 ton 5 star AC (Voltas 155 CY) at Rs.25800 instead of 1Ton 3star AC as the price is almost same for good brand. I guess the power consumption will be similar for both. Please tell me is it okay and am I right ? Thank you.

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

      Hi,

      Oversized ACs consume more electricity and thus right sizing or slight undersizing is always good as far as electricity consumption is concerned. I cannot comment on which size would be good without knowing the size of the room and the city where you live and your usage. Would suggest you to use the calculator given 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

    • prk

      Sir I tried using the calculator, your calculator shows 1 Ton 3 Star will consume 0.86 units/hour for my approx room size, if I increase room size by 1 feet in length it shows 1.2 Ton AC required and 5 Star variant of 1.2 ton will consume 0.85 units/hour. And I was getting 1.2 Ton 5 Star at same price of 1 Ton 3 Star, so I guess 1.2 Ton 5 Star is more economical for me. Please suggest and thanks for previous comment.

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

      Hi prk,

      The numbers in the calculator are just representative numbers. Power consumption varies from model to model and even star rating is a range of power consumption i.e. not every BEE 3 star rated AC consumes the same amount of electricity. And a range of power consumption numbers are given a star rating. What we have taken is the median number or the power consumption number that is most likely for a BEE 3 star rated AC (it can be more or less).

      Also an oversized AC is slightly more inefficient than a right sized AC. If your room size is more than what you have used for calculation then 1.2 ton 5 star would be good.

    • prk

      Thank you. I will think and decide final.

    • prk

      @@abhijain203:disqus

    • prk

      @abhijain203:disqus sir please reply

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

      Sir, had a family emergency to attend to, so could not reply. Please accept my apologies.

    • prk

      sir why are you apologizing , I understand that there might be some problem. Please reply to my comment to your reply above this. Thank you very much. Your website is a boon for many like us.

  • Sunny

    Hi Abhisekh,

    Can you please share the review of Voltas 183 SY model 3 star? I am planing to buy this. Also, if you can let me know any other brand in the price range of 30K – 32K? Thank you

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

      Hi Sunny,

      I would strongly suggest that you look at Calculator, FAQ and list of top ACs on this link 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 will help you choose the right size, right star rating and right model/brand of AC for your room.

    • Sunny

      Hi Abhisekh, thanks a ton, i finally bought Voltas 183SY model. I live in a remote location in Gujarat where temperature soars upto 38-39 in march and April and can increase upto 42 degree in May and June. What i have observed recently is when i start the Ac on a cool mode or saver mode, it takes around 30-40 seconds for condenser to start, till then only fan is working. Once the condenser starts then it works as expected. Is it normal or there is problem which is delaying the condenser to start? Thank you

    • shubham

      i bought the same model ac, I’d like to know whether they did air purging thorugh vacuum or not? and also, im not able to reach a temp lower than 24c(outside temp 43c). please reply

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

      For R22 the gas pressure should be about 75psi.

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

      They should vacuum the pipes while installing. Another reason could be low gas pressure for it to not cool well.

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

      Some “time delay” is needed for the compressor, but 30-40 seconds is really long. Should not take that much time if the fan has started working.

  • Nishi

    My outdoor unit is directed toward the sunlight as i stay on top floor. Due to which my room is like hell hot. Do I cover the outdoor unit with something or what should I do as there is no way to move it anywhere else, please help :(

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

      Try putting some cover or putting some plants around it. If that does not work well then you may have to shift the outdoor unit to a place where there is less heat.

  • Ratul

    Hey Man… There is a problem i am facing for a while now, I got a sharp AC and it stinks. The AC is 1.5 ton and the room size is decently big, as in my AC size is in parity with the room size. I usually run the AC at 28. it works fine for me. The technician says i need to run it at lower temperatures or it will stink. Is it true? Please help!!

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

      ACs typically stink when they are short cycled i.e. their compressor runs for very short time and there is lot of humidity. In shorter cycles it is not able to remove humidity properly and it does stink in such cases. This typically happens when AC is oversized for a room. You have mentioned that it is a Sharp AC, is it an inverter technology AC (as sharp mostly has inverter ACs)?

      Which city are you from and what is the room size? It is possible that the AC is getting short cycled at 28 and may get better if you decrease the temperature (as compressor would have to run longer).

  • Waruna

    Do you save any money by going with new LG Inverter V AC
    with Active Energy control where LG claims you can cap the compressor speed to
    40%, 60%, and 80% of total capacity? If you cap the compressor speed to say at 40%,
    it would take longer to achieve the desired temperature but it will take less
    electricity compared to running the inverter on AC on full capacity. But if you run
    the AC at full capacity, it will take less time to achieve the desired temperature
    and the compressor would dial back on its own when it achieve the target temperature in
    less time compared to running it at 40% of capacity thereby reducing energy consumption
    since its only running for a shorter period with high capacity. Given this
    situation, do you think Active Energy control actually saves electricity by
    capping the compressor speed or you think this might only work when the heat
    gain is minimal such as using the AC at night? I can however see this might help to reduce humidity with longer run times at reduced capacity.

  • Mihir

    I took daikin 1 ton ac before 1 week and my room size is 120 sq ft when i keep at 22° the compressor gets cut off in 8 to 9 min is this normal??

    • waes

      Hi
      Does it take 8 -9 mins to reduce temp to 22 degree from its first run????
      Or after considerable cooling ???

      I got a General 1.5 ton in 110 sqft room. Takes 25-28 mins to make 22 degree….then it runs 3-4 mins in every 12-13 mins….is it normal????

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

      Depends a lot on the heat load of the room and the cooling capacity of the AC. Heat load of the room depends on size of the room, temperature outside, things kept in the room, insulation of the room, appliances used in the room, etc.

    • Bhoboghure Jhor

      Brother one more thing….I’m having a new AC (General 1.5 ton ASGA18AHT with admiral compressor)….since my installation I am suspecting that my AC is not cooling as efficiently as it should be…In my 110 sqft room (undersized for AC)….it should take only a few mins to cool….it takes around 30 mins from start to make it cool….then compreessor runs for 4 mins in every 12-13 mins to maintain 22degree….I am not a pro…how can I be sure my AC is not running low in refriegerant??…Is there any way to check manually…. Both of my outdoor units copper pipe sweats while in operation…thick one gets colder than thin one and sweats more….is it OK?….my outdoor unit is placed in my balcony….but in a bit congested place….is it why its taking much more time to cool???….or my cooling time is OK….refrigerant is R22….it takes around 1 hour to make 18 degree….thanks in advance for your valuable opinion

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

      HI,

      Are you using a thermometer to check temperature of the room? Ideally a right sized AC is one which should bring the room temperature to 25 degrees in 5-10 min. Going down to 22 will take further more time and 18 would be really long. From what you have written, the cooling time looks fine to me. In fact as you rightly said, it is oversized. A right sized one will take further more to go down to 22 if you really measure using a thermometer. And there after 9 mins should be ideal cycle time. In your case it is 4 min as it is oversized. 25 is a good temperature, 22 is really cold. To me it looks fine.

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

      8 to 9 mins of compressor run is ideal. It means the sizing of the AC is good. If it cuts off in lesser time then it is oversized. If it runs much longer then it is undersized.

  • Waruna

    Is it okay to oversize on an inverter ac for a room that’s
    14x19x12 than undersize to save on electricity provided you are indifferent about
    upfront cost? If you oversize, say with a 2 ton inverter, unit will decide on its
    own what’s the best tonnage requirements to cool them room thereby using
    minimal power and electricity to achieve and maintain the temperature compared
    to an undersized or right size unit?

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

      Slight oversizing in inverter ACs is fine but not too much oversizing. All inverter ACs have a lower value of cooling capacity as well. A 2 ton inverter AC would have a range of 0.8 to 2.2 ton, but if your room needs 0.75 tons cooling then a 2 ton inverter AC would be a waste. However a 1 or 1.2 ton would still be good.

    • Waruna

      Forgot to mention. it will only for night use

  • Subhasis Biswas

    Sir, do you stay up all night?

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

      Not at all :). Only till midnight if there is work :).

  • Gsn

    Hi. Please suggest whether Inverter based ac is suitable for cities with very high temperature like Nagpur?
    Max temperature here reaches 48-49 deg in peak summers. The demo guy in electronics shop suggested us not to go with inverter based ac and buy 5star rating ac instead..in Nagpur.

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

      There is no truth in that statement. Inverter ACs work equally good across the world. 100% of Japanese market and more than 50% of European market uses Inverter Technology. And Inverter ACs have worked fantastic in India in last 5 years which is why their penetration is increasing.

  • Subhasis Biswas

    Hitachi kashikoi 300i 2 ton, is this a good ac? I can get one for about Rs. 62000

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

      Hitachi Kashikoi models are really good ACs. You should certainly go for it.

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  • Guest

    Quote: “If you set the thermostat at 18oC (64.5oF), does it mean that the air conditioner will cool the room faster than if set at 25oC (77oF)? No”

    Actually, the correct answer is Yes for Inverter AC, which are becoming more popular for their energy efficiency and ability to cool/heat quicker, than non-inverter ACs. Also, they provide better temperature accuracy.

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