Electricity Saving Tips For Homes And Offices

Various modes for running air conditioners and their impact on electricity bill

By on August 26, 2015

Hindi Translation: एयर कंडीशनर को चलाने के विभिन्न तरीके और बिजली के बिल पर पड़ते उनके प्रभाव

Air Conditioners in past used to be quite simple with just on/off switch and high, medium and low cool options. With improvements in technology, modern day air-conditioners have lot more electronics in it and thus they provide multiple modes of operation. Most of these modes are explained in the user manuals that come along with the air conditioners, but it is very important to understand the impact of each mode on electricity savings.

Air Conditioner Quick Cool

In this article we will try to explain various modes available in various air conditioners and will analyze their electricity saving potential:

Cool Mode

Cool mode is the regular or default mode in which the air conditioner runs as per the temperature setting and fans speed at which it is kept. Electricity saving potential in this mode depends on the temperature set in the air conditioner. Ideal temperature for thermal comfort and electricity saving is 25 degree centigrade (more details in our article: Ideal Air Conditioner temperature for electricity savings).

Fan Mode

In Fan mode the fan runs continuously and the compressor is off. This obviously has good energy saving impact because the compressor is switched off. Compressor is the most electricity-consuming component of an air conditioner. But the downside is that no cooling happens when compressor is off. It is better to use a ceiling fan in this case.

Dry Mode

There are days in a year when the comfort is low just because of the humidity. This happens more so in case you are located in a city that is closer to the sea. It also happens during monsoons. During those days just removing the humidity of the room provides a lot of comfort. Running the air conditioner in dry mode helps as it removes the extra humidity in the air. The fan runs at low speed and compressor is on for short duration in large cycles just to remove extra humidity. This surely is an electricity saving option during high humidity days as even the fan motor is running at a slow speed and even the compressor is on for smaller duration. The air conditioner does not blow a lot of cool air in this mode, as the intent is just to dry the air and not to cool the room.

Please note that it does not work as a dehumidifier (which has potential to make the air very dry) but is just good enough to make the room comfortable.

Energy or Power Saver Mode

In cool mode the compressor shuts off when the temperature reaches the level set in the thermostat but the fan keeps running. The compressor starts again when the room temperature increases. In the energy saver or power saver mode, even the fan switches off when the temperature reaches the level set in the thermostat. So how does it help save electricity?

  • Firstly it obviously saves electricity spent in running the fan continuously.
  • The use of fan in cool mode is not just to throw cool air in the room but it also helps in taking the indoor air for thermostat to check the temperature. In Power saver mode, the fan gets switched off for a few minutes and the thus the compressor does not start till the fan switches on again to notice that the temperature has increased. This increases the time between compressor cycles thereby making it run less and thus saving electricity.

Does it decrease comfort level? If the room is well insulated, then it may not. The temperature may increase slightly (not a lot) and if that does not disturb you then it is the right mode for you to save electricity. Also because the fan switches off and on, it makes sound every time it does so. If sound disturbs you in your sleep, then this may not be the right mode for you.

Quick Cool Mode

This certainly is not an electricity saving mode. In fact it consumes more electricity. Ideal temperature for air conditioning is 25 degree centigrade, but this option starts the AC at 16 or 18 degree centigrade. If the room temperature is 35 degrees then the time it will take to reach to 25 degrees will be the same in both Cool Mode and Quick Cool Mode (with high fan speed). In fact extra electricity is spent to get it down to 16 or 18 which is not required if you like to keep temperature at 25.

Sleep Mode

The Sleep mode increases the thermostat temperature by 1 degree after every hour till it increases temperature by 2 degrees. This will help save electricity if you like to sleep at low temperatures as you save electricity with every degree of increase in temperature. If thermal comfort is your only priority it is better to use cool mode or energy saver mode at 25 degrees.

6th Sense mode (for whirlpool ACs)

The whirlpool technology adjusts the fan speed (to high, medium or low) based on the temperature of the room. It surely has a benefit over the Cool Mode as it saves electricity on running the fan motor.

Is it good to have automatic filter cleaning feature in the air conditioner?

It surely is good to have such a feature in the air conditioner. A clean filter ensures smooth flow of cold air and room air, in and out of the air conditioner. This makes sure that the thermostat is able to sense properly and thus ensuring right operation of the air conditioner thereby saving electricity.

Operating Air Conditioner in the right mode can always help you save electricity, so please make sure that you choose the right one. We will keep updating this article as we research more on the modes and options available in air conditioners with different brands.

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



  • Phil

    What is the “Self Clean” mode? What does it do?

    • Bijli Bachao Team

      ACs’ indoor units have filters. These filters clean the air of impurities. You either have to manually clean these filters or the AC can have auto clean mode to clean the filters.

    • Phil

      Thank you. Now I know

  • Arti

    Hi i am using O general A/c 1.5 ton, wanted to know the auto cut mode

    • Bijli Bachao Team

      Hi Arti,

      Does it specifically say Auto Cut mode on the AC’s remote? Because compressors of air conditioners automatically cut off when the temperature of the room reaches the temperature set in thermostat.

  • amit

    Hi, I am using a 1 ton kenstar Ac in 12*11 Room in noida. It has started raining and high temperature is not above 34-38 and atmosphere is humid. So I tried the DRY mode of my AC. in COOL mode I generally use 27 C and it is very comfortable with fan on 2 number.
    If I compare both settings (DRY mode OR COOL mode on 27 C) at this time dry mode is giving much better cooling. Does that mean DRY mode is consuming more electricity?

    • Bijli Bachao Team

      Hi Amit,

      Electricity consumption will be more if the compressor has to run longer. In dry mode the objective of the AC is to remove humidity. Compressor has to run to remove humidity. In cool mode the objective is to bring down the temperature. If humidity is more then the compressor will run longer to remove humidity (if the compressor runs longer it will cool more). In Cool mode the objective of the AC is to attain the set temperature. If you set the temperature higher then the compressor will run less. If you set temperature lower then the compressor will run more. So a lot depends on the temperature setting in thermostat and the humidity levels. It is not necessary that Dry mode will consume more. But it will depend on the room climate and temperature settings.

  • sajal

    mu room is 130 sq ft…using sharp 1.1 ton

  • sajal

    my Sharp J-Tech inverter AC has lower limit 22 degree C when I fixed it at 16…. but it shows 25 degree when I give at 25….even when I use for 7 hours at 16… it gives 22 degree…what should I do? plz help

    • Bijli Bachao Team

      Hi Sajal,

      Do you really want to cool the room below 22? 22 is quite comfortable.

    • sajal

      actually I just need to know whether my AC has problem or not….I am comfortable at 24 degree….may be I might need 17 or 18 degree for special occasion, who knows…

    • Bijli Bachao Team

      ACs are typically sized to cool the room till 24-25. So if someone said that you need 1.5 ton AC then it is for 24-25 degrees. If you need below that, then you need to go for bigger AC. But then that will be oversized. Most right sized ACs just reach 21-22. So I do not think that there is any problem with your AC.

    • sajal

      so many thanx for giving information. I’m just curious, why the AC has option of 16-22 degree, as u said it doesn’t cool below 22 degree? my remote control shows 16 to 30 degree C

    • Bijli Bachao Team

      Hi Sajal,

      If you use it in a smaller room then it can certainly bring down the temperature to 16 as well.

    • Bijli Bachao Team

      in fact 22 is quite cold.

  • Uttam prakash

    Hello sir I am in patna bihar, my room size is about 10*12 and it is on the top floor it have also direct sunlight. How much tonnage ac will be prefer for my roomroom? Plz help me.

    • Bijli Bachao Team

      Hi Uttam,
      According to our calculation your room requires a cooling of 1 tons during night time and about 1.3 tons of cooling during peak summer daytime. What will be your usage of AC in hours/year? And will your usage be mostly at night or during daytime?

  • Lilian gonsalves

    Hi, I live in goa where there is heavy rainfall, high humidity and during summers it gets very hot and humid, need to buy an aircon which will also work as a dehumidifier as the musty smell in my bedroom affects the health of my son. We live in a bungalow,ground floor,bedroom facing west,room size 22sq.mt.please suggest the best energy efficient air con.
    Thank you.

    • Bijli Bachao Team

      Hi Lilian,
      According to our calculation your room requires a cooling of about 2 tons. Since you want energy efficient AC we recommend you to go for a 2 ton inverter AC.

      You can look at these 2 ton inverter ACs:

      brand model eer_ratio price
      MITSUBISHI ELECTRIC MSY-GE24VA 3.61 NA
      LLOYD LS24GRIX 3.6 58990
      LLOYD LS24GRI 3.6 58990
      HITACHI RAU023EUEA 3.56 58950
      HITACHI RAU024CVEA 3.55 67790
      HITACHI RAU024IVEA 3.55 64790
      HITACHI RAU024AVEA 3.55 62790
      HITACHI RAU023HVEA 3.5 61790
      CARRIER Octra Inverter (2.0T) 3.49 61750
      CARRIER Superia Plus K+ (2.0T) 3.46 60750
      CARRIER Kurve Inverter (2.0T) 3.38 55500
      PANASONIC CS-S24RKY 3.3 67990
  • aman

    what mode is best in gym tym.
    is it dry mode

    • Bijli Bachao Team

      Hi Aman,
      Yes you can try dry mode during gym time.

  • Prantik

    hi i am using voltas 183sy ,1.5 ton solit ac.when using cool mode i generally keep 27deg temp.before i used to observe that when then temp reaches to the set tempetaure the compressor stops and the cool mode light blinks. but nowadays the light never blinks.can you please tell me why.
    thank you.

    • Bijli Bachao Team

      Hi Prantik,

      You will have to call Voltas customer support for this problem. They will send an engineer to check the same. It will be difficult for us to tell why this is happening.

  • Sheetal jain

    Ac is on power sever mode, unable to change the normal mode, even after pressed the same button of that mode

    • Bijli Bachao Team

      You will have to call up the call center of the manufacturer to ask them to send a service engineer to your place. They can help you better on this.

  • Lakshmi Paramanandam

    Whether energy is consumed when the AC is in off mode by remote control. If so how much energy is consumed when compared to on mode?

    • Bijli Bachao Team

      Hi Lakshmi,
      The consumption of power when AC is in off mode by remote controls vary from model to model. We have tested some ACs and we have seen window Ac consume about 5 watts and some split AC does not consume any energy at all. So the consumption should vary from 0-5 watts.

  • mohit sidhani

    I have gone to purchase an ac and we have confusion which tne is better either mitsubushi or general or daikin

    • Bijli Bachao Team

      Hi Mohit,

      All 3 are top brands with their own pros and cons. However you cannot just select a brand without looking at specifics of each model they offer.
      There are several factors that one need to consider while buying AC:

      1) Tonnage of AC: Depends on several factors, but primarily on size of room, city where you live in, window sizes, people in the room. Oversized AC consumes more electricity, and undersized does not cool properly.

      2) Star Rating: Choice of BEE 5 star/inverter tech or a lower rating depends on your usage of AC. If your usage is more than 1000 hrs per year (with tariff more than Rs 5), it is better to go for higher efficiency models. Benefit of inverter tech is that it is a variable tonnage AC and as the tonnage requirement is different every month and every day, this AC auto adjusts to the needs and thus saves electricity.

      3) Brand: Some brands offer better reliability/technology and some have better service network. One has to factor in both. Once you have decided on star rating, the most efficient models from good brands can be selected.

      If you provide us with more details as in which city you are in, what is the size of your room, which floor they are on, is there any floor above it, are the walls exposed to sun, usage in hours per day and months per year, and approximate budget, then we can suggest you something.

    • mohit

      I want ac for my shop in which we require 2 ton three ac ‘ s we run ac almost 7-8 hrs per day it is on ground floor also it is not exposed to sun directly from three side . Only from front sunlight can come but in less amount as shades are there . And also budget is not a problem and ya i live in vadodara city,state gujarat

    • Bijli Bachao Team

      Hi Mohit,
      If your usage of AC is more than 6 months in an year we recommend you to go for an inverter AC.
      Mitsubishi Electric MSY-GE24VA 2 ton inverter AC has an EER of 3.61 it is the most efficient 2 ton AC. You can go for it.

      Tell us if you need a list of BEE 5star 2 ton ACs.

    • mohit sidhani

      Ok thanks so i should prefer mitsubishi not general

    • Bijli Bachao Team

      Well brand wise both are great brands. We are just suggesting you a model which is more energy efficient.

  • ganesh

    I have whirlpool 3d Cool split Ac. When I purchase it in mar 15 it was first cutoff within 15 to 20 minutes but now the same will take above one hours is this normal or otherwise. How to rectify the same,is there is low gas problems.

    • Bijli Bachao Team

      Hello,

      Heat load is more in May than it was in March. So it would certainly take more time to cool in May than in March. Cooling will also depend on the size of your room and various other factors. If your AC is undersized it would run for long. However this is the third time you are having issues with your AC and it seems you are not liking it.

  • s.rajesh

    Which is best way to easy cutt of on ac or low level energy consumption mode if any

    • Bijli Bachao Team

      Try increasing the temperature to levels that feels just comfortable. Higher the temperature faster your AC should cut off. Try energy saver mode or sleep mode.

  • s.rajesh

    Sorry sir I tell abt my ac should not cutt off it am try another all modes then if continuous running on compresser if any time for cutt off level to reach it then eco mode and another modes are consumption the same unit no difference on eco mode I select icool mode 18 degree and eco mode 25 degree work in same consumption the same unit then give suggest to use ac low consumption of EB

    • Bijli Bachao Team

      Hello Mr Rajesh,

      Power consumption should not be the same for 18 degrees and 25 degrees as the compressor should cut off earlier if you set it to 25. If your compressor is not cutting off at 25 then it means that your AC is smaller for your room and it is not able to cool properly. What is the tonnage of your AC and what is the size of your room? Also which city are you in?

  • s.rajesh

    Helo sir am using onida 1.5 ton 3 star rating split ac my complaints is should city of it try all mode but didn’t city off it on my room doors all of them tightly closed amnt use ceiling fan

    • Bijli Bachao Team

      Hello Mr Rajesh,

      I could not understand your comment.

  • krishna

    Hi u prefer 25° to save power. My doubt is we use at 29° . which is better temperature to save power.

    • Bijli Bachao Team

      keeping at 29 will save more power. We recommend people not to go lower than 25.

  • SOF

    How to activate health mode and its utility.

  • Niketa

    Dry mode + eco mode vs auto mode… which is more energy efficient?

    • Bijli Bachao Team

      Dry mode + eco mode should be more energy efficient.

  • chandrapal singh

    Somtimes my voltas split ac shows ES on display screen what does it mean? Is therr any. Problem with my ac?

    • Bijli Bachao Team

      Hi,

      We are not very sure about it. You may contact Voltas customer support regarding the same.

  • Amrit

    How much time 1.5ton ac should take to coll down 150 sq feet Rome to 25 degree .its a whirlpool ac I runs ac all night on 25 degree but it don’t auto cut all night

    • Bijli Bachao Team

      Hi Amit,

      Depends on city and conditions (outdoor temperature). However 1.5 ton AC should bring down temperature in a 150 sq ft room to 25 degrees in any city at night. The compressor should turn off. It will run for long if doors and windows of the room are open, however still it will cut off after a long time.

  • Shariq

    Hi BB Team,

    Thanks for reply however what i meant when i asked that question was, that provided that inverter ac’s will save electricity however if use the timer in which it will be cooling for 1 hour and then ( i am just guessing) it will be either power off or go to stand by mode… When the AC starts as per the timer then will it take a significant electricity to start back on ? or when its in stand by mode will it still be consuming same amount of electricity … In a nut shell will timer help bring more economy to my electricity bill ?

    Today i again visit the market and checked some other ac’s again , so it will be daikin or Samsung. Now Daikin is experience and the delaer is pushing me for Samsung saying that it has 10 year compressor and 5 year condensor warranty on it. Do you think that its a better deal because he is offering this to me @45K which includes (3.5 mtr copper wire+free installation) however stand ,stabalizer and other accesories will be at my cost. Where as Daikin is 45K (includes copper wire) + installation+Stabalizer+Stand etc will be on me. Do you think its better deal than Daikin or is daikin still worth it… Please help me with you advise. Also you said that your personal favorate is Daikin, Could share any experience which made you inclined towards daikin. Thanks in advance BB team.

    • Bijli Bachao Team

      Hi Shariq,

      I personally have a 0.75 ton inverter AC for my 120 sq ft room in mumbai. In the afternoon when I start it, it runs at 110% capacity (or 0.9 ton) for first 10 mins. Then it runs at 100% capacity (or 0.75 ton) for next 10-15 mins, then it comes down to 80% capacity and in about 45 mins it comes down to 60% capacity. And then it continues to run between 40-60% capacity for as long as I run it. At night the same comes down to 20% capacity after initial couple of hours and runs mostly at 20%. All this at thermostat setting of 26 (in Mumbai day temperature is about 33-34 and night is about 28). The power consumption also varies accordingly. The power consumption is 750 watts at 0.75 ton and when at night it runs at 20%, it mostly runs at 100-150 watts. In the whole night and 8 hours of usage, it consumes 2 units of electricity. And please note this is not the most efficient Inverter AC. It’s EER is 3.3.

      Now if you look at this, there is saving in 1 hour of usage as instead of running AC at 100% capacity for 70-80% time, it reduces the tonnage significantly in 1st hour itself. However once the temperature in the room is stabilized it runs at much lower tonnage. But if stop the AC the temperature of the room will increase and the next 1 hour will again go in stabilizing the temperature.

      Now regarding Daikin:

      1) I have a panasonic and a friend of mine has Daikin of same tonnage for similar sized room. The AC is slight undersized. But his AC cools better (more) than mine. We did temperature checks and found Daikin better. The minimum my room temperature could reach was 24 while that went to 21 (although after a long time). However even at 24 my room feels quite cold. Just that my expectation was more :).

      2) We have heard complaints of almost all brands but we have heard least about Daikin.

      3) Energy Efficiency numbers of Daikin inverter ACs are quite impressive and Daikin is a pioneer of inverter technology.

    • Pradeep mishrs

      Can you share the model no. of both ac’s?

    • Bijli Bachao Team

      Hi Pradeep,

      They are Panasonic CS-YS9RKY and Daikin FTKE25GV1.

    • Pradeep mishra

      Thanks..but i failed to find their bigger siblings..are they obsolete?

    • Bijli Bachao Team

      These were models from 2013-14 …. they were purchased early last year.

  • Ganesh

    i have whirlpool 3 D Cool Delx Plus III Split Ac, it makes lots of noise during startup and cutoff it is normal or otherwise

    • Bijli Bachao Team

      You should certainly lodge a complaint with Whirlpool regarding the same. It is not normal.

  • Shariq

    Hi Jatin,
    Thanks for you insightfull and frank advice, it indeed is usefull. Well about Flipkart or anyother ecommerce website i confirmed with Daikin and they say that post 28th Apr 2015 any AC bought from any Ecommerce website Daikin will not provide warranty on it. So i guess i will have to go a store to buy one and try and haggle a deal. Now Talking about the electricity consumption looks like your usage is not high for the month. However you have said that you run the ac for 8 hours in the night now have you used timer or the ac was consistantly running for this whole time ? I have a confusion about the timer functionality for e.g if i want the ac to power off for 1 hour after working for 1 hour so that mean that the ac is cooling for 12 hours in a day however its running for whole day, so my question is will the ac consume the same or a little ac in this situation ? I have asked this question from BB team and awaiting for their reply….

  • Priya arora

    Hi

    I live in delhi and i have bought blue star 1.5 ton ac. I normaly set d temaperture at 25 degree at cool mode. If my room temperature let say is 35 degree it start getting decreases to a certain point like 30 nd den d temperature automaticaly start increasing again to the 31 32 33 and their is den no cooling for atleast 20 min and room get heated. After dat it repeat the whole process. I dont know y it is happening is their any problem with my ac?

    • Bijli Bachao Team

      Hi Priya,

      It seems the compressor is stopping after working for some time. Is the outdoor unit of your AC directly facing the sun? In such cases in Delhi the temperature of the outdoor unit rises so high that the compressor stops working. You may read more on this link: https://www.bijlibachao.com/air-conditioners/possible-reasons-for-air-conditioner-not-cooling-properly.html

  • Shariq

    Hi BB Team,

    I am buying an Inverter AC Daikin FTKP50PRV16 and ROI is the reason why i am buying inverter AC. I would like to know that if i use the ac for e.g i set the timer in a way that it will cool for 1 hour and then turn off for 1 hour.So my ac will be running 24 hours however it will be cooling for 12 hours, now when the timer of AC turns it off does it still consumes the same electricity.And by using the AC in this fashion my daily usage would be 12 hours a day.Do you think that using the ac in this fashion is bad.I live on the 2nd floor in delhi the room room is around 10-12 yards not exposed to sunlight at all.

    Also please share your thought about Daikin,Samsung and Sharp inverter series. I see that Samsung is providing free installation + 10 year warranty on Compressor and 5 years on Condenser which sounds very pleasing. But i spoke to a guy who works in Samsung itself and he advised me not to buy samsung because he bought one 5 years back and says that he has invested a lot in it. Please share your thoughts with us.

    • Bijli Bachao Team

      Hi Shariq,

      Firstly I must say that with inverter AC the benefit will be more if you run longer hours and it will be less if you switch it on for 1 hour and turn off for one hour. This does not mean that you will not save in 1 hour of usage. It just means that you save more for longer use as the temperature stabilizes in the room and the heat load reduces and the compressor starts running at much lesser capacity and much higher energy efficiency.

      As regarding Daikin, Samsung and Sharp. They have good high energy efficiency ACs. Samsung however has aluminium Parallel Flow Condenser. Which is efficient, but if it fails it needs change. And especially if your area is having harsh climate, then corrosion is quite likely. But the AC is highly efficient. Daikin is one of the best brands out in the market. But is a bit expensive (their price does not include copper pipes, installation, etc). But certainly a great buy as we have had feedback from several people having good experience with it. Sharp is a relatively new entrant in Indian market. It is quite popular in international markets and makes great Air Conditioners. In fact it is one brand for which we have got the most positive feedback on this forum. Sharp is relatively cheap and real value for money brand. If you just want the best then I would say Daikin (which is also my own personal favorite), but Sharp is value for money.

  • Mazaher

    Hello Bijli Bachao Team

    I live in kolkata and i run my Samsung 1.5 ton inverter AC at
    Cool Mode : 24 degree Celsius with low fan speed and my ceiling fan also runs at low speed.
    But the problem is i feel cold after 30 mins but when i turn off my ceiling fan i feel a little discomfort and when i turn off the Ac i feel more discomfort.
    Till now I’ve been using my Ac at regular intervals. for Example i run my ac for 30 mins then i turned it off and then i turn it on after few hours.
    So my queries are which mode and what temperature to set my Ac at ? is using Ac at regular intervals during a day has a bad impact or not ?

    P.S : My Ac is 2 weeks old but i have used it for less than 4-5 days, so should i clean the filter by myself or call the Samsung Guy or should i just wait ?

    Thanks & Regards
    Mazaher (Kolkata)

    • Bijli Bachao Team

      Hi Mazaher,

      24 degrees is quite cold. And if you are feeling cold at that temperature then you may increase the temperature to 26-27. We personally find about 27 to be quite comfortable. And it is not just comfortable, but it saves electricity as well. Turning off and turning on after few hours should not have a problem. But if you want to feel comfortable, you should just increase the temperature. We have seen people feel comfortable (and not cold) at about 26-28 degrees.

  • srinivas

    what is self diagnosis and auto protect mode

    • Bijli Bachao Team

      Not sure sir. Which brand is this? Some brands have gas leakage detection which switches off the AC whenever there is a leakage or any other problem.

  • Ravi

    Hi, I have voltas 1 ton Ac , I always keep AC temperature on 25 which feels comfortable at night but but feels really cold in the mrng is there any problem with AC that its not mantaining the room temp to 25.

    • Bijli Bachao Team

      Hi Ravi,

      At night the heat load in the room decreases (it becomes much less than 1 ton) and the 1 ton AC becomes oversized and it starts overcooling. It is normal with all fixed speed ACs.

  • Ganesh

    i had purchased whirlpool 3D Cool Deluxe plus III 1.5 tone 3 star rating split ac on dt. 27.03.2015, this split ac do not hold the cooling effect whole night after running the AC two hours on 24 degree. what is the problem with the split AC. Whether the freon gas level is low or otherwise. Please tell me the solution to rectify the above

    • Bijli Bachao Team

      Hello,

      There are several things that add to heat load throughout the night. Human bodies release heat. If the atmosphere is hot outside then even the walls conduct heat. So it is not necessary that if you switch off your AC then the room will remain cool throughout the night. If the AC is on and still it is not cooling, then one can say that there is problem with the AC.

  • Prajot

    Is sleep mode equal to energy saving mode.Because I have an ac of panosonic at home there are only 4 modes auto dry cool sleep.Which of these modes provide that compressor automatically cools down after cooling and get automatically on? Pls tell me fast.

    • Bijli Bachao Team

      They are different in different ACs however both modes save electricity. In Sleep mode the thermostat temperature increases by 2 degrees during the night. When you increase temperature, electricity consumption decreases. And thus this helps. Some ACs have energy saver mode in which the AC shuts down completely for some time after cooling the room and starts again in a few minutes. There is no change in temperature in this mode.

    • Nitin

      Hi sir.
      I am using Videocon we2 1.5 ton split ac with power consumption is 1680 watts, plz tell us how many units will be consumed in one hour continues running and what is the use of auto mode in split ac, us this consume less power..
      I my ac there are four modes, auto, sleep, dry, cool, wich mode is better to use less power consumption.

    • Bijli Bachao Team

      Power consumption of AC depends on several factors as we have listed on https://www.bijlibachao.com/air-conditioners/things-that-impact-electricity-consumption-in-air-conditioners.html …. to give you exact number is extremely difficult without measuring. However for a high level approximation we assume that the compressor will be on for 80% of the time, so the power consumption would be 1680*0.8/1000 = 1.34 units per hour. However compressor on time will depend on factors in the room.

      Auto mode sets up the speed of fan automatically as per the temperature settings. However it does not save electricity. Out of the four modes you have listed, sleep mode will save electricity as it will decrease the temperature setting of the AC after some time of running.

  • soumyarup

    I have one question, if I run my AC on fan mode and not use the ceiling fan much then will it consume more or less electricity? I have Hitachi AC(5 Star rated)

    • Bijli Bachao Team

      AC Fans typically use 150-200 watts. Ceiling fan would consume about 75 watts.

  • Shard

    How I can put off Voltas Split ac automatically after preset time?

    • Bijli Bachao Team

      Either the AC should have a timer feature or you may have to put an external timer switch for the same.

  • Jatin Dedhia

    First of all many compliments for this very resourceful website. I have purchased Daikin FTKP50PRV16 – 1.5 ton inverter AC and am pretty satisfied. I stay in Bangalore and wanted advice on one thing. I keep the AC on for full night with a temp setting of 26-27 degrees (we found this is our comfort zone). However, by morning, my throat hurts, possibly due to dryness (AC removing humidity). This happens only on the nights I keep AC running for full night. Since Bangalore is not as humid as Mumbai or Chennai, is there something that can be done to not use the humidifier function of AC? What settings can I use? (I am currently using the AC in Cool mode).

    • Bijli Bachao Team

      Hi Jatin,

      ACs do suck out all the humidity from a room and probably that is why you feel dry in the morning. You may put a humidifier in your room if it is getting very uncomfortable. I am not aware of any function that will reduce dehumidification by an AC.

    • Jatin Dedhia

      Thank You for your reply. I will keep on experimenting with various options to see which best will suit me.
      Keep up the good work BB team.

    • Shariq

      Hi Jatin i am planning to buy this model the one you are using. Can you tell me whats your daily usage (in Hours) and if you have got the electricity bill how many units have been consumed and what difference have you felt using an inverter ac than a normal star rating ac in terms of electricity consumption

    • Jatin Dedhia

      Hi Shariq,
      My daily usage was expected to be approx 10 hrs (2 hrs in daytime and 8 hrs in night) but it was for only 1 week that I was able to utilize it this way. After that Bangalore climate cooled off due to rains and there were days where I did not use it. So my AC usage over the past 1 month is sporadic. Also note that our comfort zone is 26-27 degrees and we have never used our AC with 22 degrees etc.
      Regarding elex bill, same goes – last few months my bill varied due to varied usage circumstances and it has been inconsistent. Today I received my latest bill which included the 1 month of AC usage (which was not really 1 month!) and it wasn’t heart breaker. If I have to take a wild guess, I would say probably Rs 1000 extra (this would factor in heavy AC usage during first week and then almost no AC usage second week and less AC usage 3rd week and moderate usage 4th week). Also note that we used less geyser (we have storage kind of geysers) during this month (cold water zindabad for the heat) so that’s why its difficult to accurately predict the amount contributed by AC and hence 1000 extra is wild guess. Now I am back to using AC regularly.
      I do not have any other AC so cannot comment on inverter v/s regular.
      Since you are planning to buy this AC, I wanted to give you 2 unwanted advice based on my experience-
      (1) If you are onto online buying, I have seen Flipkart to have consistently low price and deals (infact I also saw recently that with discounts etc it was coming down to approx 35K – 36K). Make sure seller is WS-Retail. If the difference between regular 5-star AC and inverter is not much due to discounts, then it makes sense to invest in inverter AC. I bought mine from Amazon when they were having 5000 cash back promotion and I paid 47 K (so with 5k cashback effective price would be 42 K). However a day after I ordered one reputed seller (from whom I had bought my fridge) dropped the price at Amazon to 43 K (so net price 38K). So compare online to local dealers.
      (2) Daikin ripped me off with installation charges so try to get free installation. With online merchants you don’t get free installation unless explicitly stated. Daikin charged me Rs 2850 for installation (including basic accessories which did include 3 meters copper cable). I had to pay for 1 extra meter of cable and also for bracket to house exterior unit so my total installation cost to Daikin was Rs 4500. Wait – that’s not it. Daikin doesn’t even provide electrical wire or water outlet tube so I had to get all those costing me additional Rs 1100 (my outlet was away from the exterior unit so long wire was needed). I then faced issue with the electrical socket so had to do more jugad (this was not due to Daikin but specific issue for my apartment) costing me another 1000 bucks :(
      So for me it did turned out to be pricey affair. Note that this model has inbuilt stabilizer so I was able to save on that (and if dealer offers you free stabilizer then negotiate additional discount by giving it back to dealer).
      Overall I am happy with the AC performance except the issue that I listed above related to humidity (again this is only specific to me and not my family – they did not face any dryness issues).
      Hope this info helps and feel free to ask further follow-up questions.

    • Bijli Bachao Team

      Thanks for sharing your experience Jatin!

  • Rakesh

    Hi BB Team,

    Can you tell me how much electricity is consumed when A/C is in stand by mode through out the day?

    Thanks,
    Rakesh

    • Bijli Bachao Team

      It depends on model to model. We have measured some window ACs consuming 4-5 watts constantly (which means about 24*5/1000=0.12 kWh or units per day). While some split ACs have shown 1 watt to negligible consumption. But the split ACs we measured were latest models while window ACs were old models. So worst case about 4-5 watts is what I would say. But if you have a new split AC, highly likely it is 1 watt or less.

  • Manoj Kumar

    Thanks for the reply. I have budget of Rs30000 to Rs35000 may be if recommendation is really good i can increase. I had checked online for required tonnage from 3 sites ( recommendation is 1 Ton) but the sales person recomended 1.5Ton.

    We have provision for window AC provided by builder, whether I should go with window AC or Split.

    Usage will be maximum in summer as in other wheather it’s not very hot. May be sometime during monsoon.

    We are based in Mumbai. Room dimension is 13*10*10 (l*b*h) and window is 40sq feet. Direction is South -West.

    • Bijli Bachao Team

      Hi Manoj,
      Can you tell us which floor is your room, is it at a lower floor, or at top floor with direct sunlight falling on the ceiling? And what is your usage of AC in hrs/yr? (This is important to calculate the tonnage required and the right model of AC for your room)
      We recommend people to go with split ACs as the BEE star rating of window ACs is one level lower than that of split AC.

  • Manoj Kumar

    I am based in Mumbai and room size is 130 sq feet.
    How much should be the tonnage of AC?
    Which is better option Window or split?
    Which brand is better Hittachi, O General or Daikin?

    • Bijli Bachao Team

      Hi Manoj,

      There are several factors that one need to consider while buying AC:

      1) Tonnage of AC: Depends on several factors, but primarily on size of room, city where you live in, window sizes, people in the room. Oversized AC consumes more electricity, and undersized does not cool properly.

      2) Star Rating: Choice of BEE 5 star/inverter tech or a lower rating depends on your usage of AC. If your usage is more than 1000 hrs per year (with traiff more than Rs 5), it is better to go for higher efficiency models. Benefit of inverter tech is that it is a variable tonnage AC and as the tonnage requirement is different every month and every day, this AC auto adjusts to the needs and thus saves electricity.

      3) Brand: Some brands offer better reliability/technology and some have better service network. One has to factor in both. Once you have decided on star rating, the most efficient models from good brands can be selected.

      If you provide us with more details as in which city you are in, what is the size of your room, which floor they are on, is there any floor above it, are the walls exposed to sun, usage in hours per day and months per year, and approximate budget, then we can recommend you something.

  • sumit

    Hello sir am planning to buy a ac of 1.5 ton so kindly suggest me which company ‘s ac will buy.in my area only Godrej ,LG,voltas are available. My room is 13*20ft.my budget is 35000 only

    • Abhishek Jain

      Hi Sumit,

      There are several factors that one need to consider while buying AC:

      1) Tonnage of AC: Depends on several factors, but primarily on size of room, city where you live in, window sizes, people in the room. Oversized AC consumes more electricity, and undersized does not cool properly.

      2) Star Rating: Choice of BEE 5 star/inverter tech or a lower rating depends on your usage of AC. If your usage is more than 1000 hrs per year (with traiff more than Rs 5), it is better to go for higher efficiency models. Benefit of inverter tech is that it is a variable tonnage AC and as the tonnage requirement is different every month and every day, this AC auto adjusts to the needs and thus saves electricity.

      3) Brand: Some brands offer better reliability/technology and some have better service network. One has to factor in both. Once you have decided on star rating, the most efficient models from good brands can be selected.

      If you provide us with more details as in which city you are in, what is the size of your room, which floor they are on, is there any floor above it, are the walls exposed to sun, usage in hours per day and months per year, and approximate budget, then we can recommend you something.

  • yesvindra

    hi abhishek
    what is your opinion regading Samsung ar18hv5dawknna 1.5 ton inverter ac. perhaps it is highest eer 3.82 in market . pls suggest should I go with it.
    I heared Samsung used alluminium coils in their units which are not durable(as per many internet review) . are these coils are repairable.what do you think should I go with it or not. I also heared now every inverter ac manufacturer use alluminium coils to reduce the cost.
    pls suggest what should I do?

    • Abhishek Jain

      A lot of brands had aluminium models till some time back. Now most have moved to blue fin which is aluminium coated with anti corrosion resin. Even Samsung has blue fin now. In fact Samsung ar18hv5dawknna has triple protection from 1) Corrosion 2) Voltage 4) Temperature. So I do not think that Samsung inverter is a bad choice. It’s EER is also quite good.

  • Rama Raju

    Hi,

    I am planning to buy Hitachi I -Clean Inverter AC of 1.5 Ton. Please suggest whether to go ahead?

    • Abhishek Jain

      It is one of the highest energy efficiency rated 1.5 ton inverter AC. You can certainly go for it.

  • ANIL

    Hi,
    I want to buy 1T inverter AC with copper condensor in Mumbai .
    Which are top 3 brands , I should prefer

    • Abhishek Jain

      Carrier is the only one that claims to be 100% copper. Most others have copper coils and aluminium fins. Carrier Superia plus 1 ton inverter AC is quite good.

  • himanshu kanaujia

    Which 2 ton ac I should buy which have all the features. .
    I am totally confused

    • Abhishek Jain

      Hi,

      There are several factors that one need to consider while buying AC:

      1) Tonnage of AC: Depends on several factors, but primarily on size of room, city where you live in, window sizes, people in the room. Oversized AC consumes more electricity, and undersized does not cool properly.

      2) Star Rating: Choice of BEE 5 star/inverter tech or a lower rating depends on your usage of AC. If your usage is more than 1000 hrs per year (with traiff more than Rs 5), it is better to go for higher efficiency models. Benefit of inverter tech is that it is a variable tonnage AC and as the tonnage requirement is different every month and every day, this AC auto adjusts to the needs and thus saves electricity.

      3) Brand: Some brands offer better reliability/technology and some have better service network. One has to factor in both. Once you have decided on star rating, the most efficient models from good brands can be selected.

      If you provide us with more details as in which city you are in, what is the size of your room, which floor they are on, is there any floor above it, are the walls exposed to sun, usage in hours per day and months per year, and approximate budget, then we can recommend you something.

  • viral

    I simply use automatic mode

  • Vimal

    Dear Sir, Great Article, Pl put commonly used signs on remote / AC indicating the modes because there we dont find anything written like cool mode dry mode etc.
    Further MY room has 3 star Voltas 2 Tone AC room size 13×16 ft one big glas door 5×6 on west but well curtained, two window 4×5 on south well curtained and other two wall is toward other rooms( do not heat at all).. west do not get much heat during day,(only two hr a day and even that has some hollow parts with box type wall structure covering 4/3 wall area) south wall has two layer wall( 14 inch thick) except the Door towards balcony, South gets heat for two to three hour after a 3.00 pm in noon. THe room has roof with no POP and gets heated to some extent.. now problem is that my AC consumes too much power and my bill increases by RS 2000.00 per month for 5 hr use during night in summer of this AC.Please note i set 25 degree temp in cool mode generally and off timer at 4.00AM i start aprox at 11 PM .Is this ok or its using too high?? what should i do to reduce energy consumption??

    • Abhishek Jain

      Hi Vimal,

      Which city are you in? A BEE 3 star 2 ton AC would be rated at about 2 kW (as per latest BEE ratings). Assuming it is right sized it should be on about 80% of the time in summers. So it would consume 2 x 0.8 = 1.6 units in an hour (in summers). So in 5 hours it will consume 1.6 x 5 = 8 units. So in 30 days it will consume about 240 units. The best way to reduce electricity consumption of air conditioners is to improve insulation of the room. You can get a lot of ideas on insulation on the insulation section of this website: https://www.bijlibachao.com/save-electricity/insulation . The other thing that you can do is to use a timer switch https://www.bijlibachao.com/general-tips/time-switches-easy-automatic-way-to-switch-on-and-off-appliances-and-save-electricity.html

      The timer switch can be programmed in such a way that it switches on the AC for a short duration and then switches it off. In my own air conditioner I have a energy saver mode in which the AC remains on only for 15 mins in an hour. It cools it enough and as the doors and windows are tightly closed, the room remains sufficiently cool for rest 45 mins. Then again it starts for 15 mins and then switches off. The result is that in 8 hours of use the AC runs only for 2 hours effectively resulting in a lot of saving.

  • Farooq Surti

    I have purchased second hand 2star whirlpool split ac. I have its remote but don’t have manual. I am unable to understand on which mode it is as remote shows only symbols of mode rather than its name. Can you please mail and answer all the symbols with its name. One more question, currently it is not giving much cooling and temperature goes down very fast from 28 to 18 in hardly 3 minutes and compressor goes off when it reaches 18. Please suggest as I am unable to get the cooling.

  • Manoj Kumar Sharma

    wonderful information. I have doubt, how ac fan mode works/ does it circulate the fresh air from outside or just circulate internal room air?

    • Abhishek Jain

      Hello Mr Sharma,

      ACs do not get fresh air from outside. They just circulate internal room air in fan mode.

  • Ashwani Babbar

    Hi Abhishek

    Thanks for the wonderful information shared. Yesterday as Monsoon started in Delhi/NCR and it rained, so I decided to try Dry mode post reading your article. I kept AC temperature as 25 degrees Celsius, after certain point of time AC got turned off (compressor and fan both), seems it worked as its working on Energy Saver Mode. Can you please let me know if this is true.

    • Abhishek Jain

      Hi,

      Dry mode should not work as energy saver mode. Dry mode is more to remove humidity. You should check the operating manual of your air conditioner.

  • vinay

    Hi Abhishek, i have sharp 1.5 ton inverter AC AHX18PET. Can you please tell me that AC in cool mode at 28°c will use more electricity or in dry mode at 28°c? Thanks in advance.

    • Abhishek Jain

      Dry mode will consume more electricity at same temperature.

  • deepak

    Why does ac makes noise when compressor is on

    • Abhishek Jain

      compressor is just like a motor. When a motor works it makes noise, similarly when compressor works, it makes sound.

  • Rahul Sreekandan Nair

    Hi Abhishek,
    I was going to purchase a Lloyd Air Conditioner 1.5 ton which was too cheap. The sales man wrapped me in offers and schemes but after reading to your blog, i found out how to choose an Air conditioner. finally i bought a Samsung 1.5 ton 5 Star Air Conditioner. The price is little higher but i feel proud of myself that i have made a wise decision. All credits to you Abhi. Thank You so much.

    • Abhishek Jain

      Awesome Rahul. One step towards saving electricity for self as well as for the betterment of all in the country :).

  • Harman

    Can u please explain me auto function in ogeneral ac as it feels complicated? How it actually works ? N how to set it ?

  • neha

    Sir I have voltas 4011097 model. It doesnt have energy or power saver mode… and in cool.mode it does not get fully off after attaining desired temperature … fan continues to run. Please suggesy me some way how can I save electricity with this a.c.

    • Abhishek Jain

      Hi Neha,

      What temperature do you use the AC at? Do you get direct sunlight on any of the walls? Are there any more rooms on top of the room? Do you keep the doors/windows/cupboards closed while using the AC? Are your windows big or small and do you get direct sunlight from the windows?

  • Rajesh

    Dear Abhishek
    I like to know what happen to Fan motor of outdoor unit in auto mode when indoor unit fan & compressor stop running.

    what should be ideal logic in auto mode once desire temperature achieve and compressor stop running should indoor unit fan stop till temperature goes up if so how thermostat sense the temperature.

    Rajesh

  • surjit singh

    i have a godrej ac one ton. i want to know ac air out put tempreture if ac on 16. my ac not working properly. there is only 16degree c air out put tempreture. plz let me know how much air tempreture when ac is runing.

    • Abhishek Jain

      Mr Singh,

      You should be able to increase the temperature on the AC. 16 is too less, you should try to keep it at 24 or 25. You can check the manual of the AC to figure out how to change the temperature.

  • balu

    iam using mitsibushi mr.slim 1.ton ac my room size is 13/13 this is perfect ac for my room coz my room is not cooling

    • Abhishek Jain

      Which city is this for?

  • Sachin Pathak

    The Sleep mode increases the thermostat temperature by 1 degree after every hour till it increases temperature by 2 degrees. This will help save electricity if you like to sleep at low temperatures as you save electricity with every degree of increase in temperature. If thermal comfort is your only priority it is better to use cool mode or energy saver mode at 25 degrees

    Question :

    That i am using this function /Mode but My Air compressor only turns on for a few hours in the evening then at some point in the night it turns off (even though the temp is above the thermostat setting) The fan blows continuously… So then we have no cold air for most of the day..

    I’ve tried shutting down power for 10 min, and then turn it back on. In the first 2 min, I can hear the compressor active, and cold air comes out of the vent. But afterwards, i hear a thump, and the compressor noise is gone, and no cold air comes out. can any one provide a diagnosis as to what the problem may be? could it just be my thermostat acting up or does it require a technician?
    Regards
    Sachin pathak
    +91 9927200166

    • Abhishek Jain

      Hi Sachin,

      It is better to call the helpdesk of the manufacturer of the AC. Ideally compressor should startup again once the temperature rises much above the setting in the thermostat. If it is not happening, then there may be a technical problem in the AC.

    • Arslan

      Get the capacitor of ur AC replaced. Ur compressor heats up due to faulty capacitor

  • vimal

    i have a 1.5 to split ac Godrej Eon. when i switch of the ac using my remote, the fan (outdoor unit) keeps running. what could be the possible problem ?

    • Abhishek Jain

      you should call up Godrej service support and ask the engineer to come and inspect. It surely looks like a problem.

  • Ashok Suthar

    i want to buy 1 ton inverter ac. please guide me as of which brand to buy between O general with R410 or Daikin with R22

    • Abhishek Jain

      Hello Mr Suthar,

      O General with R410 will be better than Daikin with R22.

      Regards,
      Abhishek

  • Abhishek

    I do not agree that Jet Cool/Quick cool/Turbo modes necessarily are more electricity consuming. On the other hand it might be exactly the opposite if a person knows how to use it well. In non inverter ACs the compressor runs at peak capacity until the desired temperature is reached both in cooling mode and in quick cool mode. The only difference is that in most ACs, the fan runs at its highest RPM during quick cooling. This high RPM means that more air will be circulated in less time. Thus higher volume of room air is cooled in considerably lesser time. Once the user feels that the room has cooled down to a comfortable temperature, like around 26C, he or she can then turn off the AC completely and the room usually stays cool for a long time. Of course if you are lazy or forgetful, then quick cool mode can burn a big hole in your pocket as well as mess with your health because unnaturally cold temperatures and extremely low humidity levels are bad for your health. Good article this one though!

  • Kalpana malani

    What is the energy consumption of a 1.5 ton room AC in fan mode?

    • Abhishek Jain

      Hello,

      Hello Ms Malani. In Fan mode, the compressor stops working and it is only the fan which is on. We did a measurement on our own 1.5 ton air conditioner and we found that the wattage in Fan mode varied from 110 W to 150 W (based on the speed of the fan). So compared to cool mode a Fan mode will consume a lot less. But there will be no cooling. Also it is better to use ceiling fan instead as it will consume a lot less.

      Regards,
      Abhishek

    • Abhishek

      One of my Samsung 1.5T AC’s fan motor malfunctioned and had to be replaced. At that time I had a chance to inspect the fan motor’s specifications and the maximum power consumption was specified as a mere 31 W only!

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