Electricity Saving Tips For Homes And Offices

Ideal Air Conditioner temperature for electricity savings

By on January 18, 2017

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.

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.

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

 

 

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378 comments

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1

Hello all i just want to know that in ac new stabilizer there is humming sound continue..is that normal in stabilizer...

2

Hi,
I brought Panasonic split ac yc12sky4 1 ton 4 star yesterday and running very nicely. I am living in kalyan and in ground floor where no direct sun facing. My room size is 14 *9 feet. i feel cold at 24 degree temperature so i kept 28 and kept running for whole night and i found very comfortable at 28 temperature. what should i do to bring down my electricity bill.

3
Abhishek Jain (Mod)

Keeping it at 28 (or high temperature) is the best to bring down electricity consumption. So you are doing good.

4

Hi Abhishek,

I am from Hyderabad. Room size is 12(l)*12(b)*10(h). It's a 4 storey building. We are in 2nd Floor. One side of the room is Noth-Eastish. Therefore direct sunlight on that one wall from noon (But with reduced intensity due to a tree). Outdoor unit is at East, no direct sunlight at all to it.

Our usage is mostly for nights (10pm to 8am), except on Saturdays & Sundays. Mode used is always "Cool". Fan speed sometimes 'Slow' & sometimes 'Fast'.

A month back I have bought a Mitsubishi Heavy 1.1 Ton 5 Star Fixed speed AC (Model : SRK 13 CRS-S6). After using for 1.5 months, I have certain queries and need your inputs on the same. My future AC decisions will be based on your inputs.

1. Firstly, did I choose the right tonnage for my room?
2. At nights, the cut-in & cut-off cycles might be good (ranging anywhere from 7min to 15min per cycle depending on temp setting of either 26c / 27c / 28c). But cycles apart, the initial cool down takes a long time even at 10pm, say around 1 to 1.5 hrs, not sure. Is this something to worry?
3. Now during weekends, in the afternoon, setting at 26c, I feel the AC takes a long long time. It pleasants the room but the compressor doesn't cut-off even after 1.5 to 2 hrs. I observed this yesterday at 4:40pm. Compressor was running nonstop until 6:40 and then I switched it off. Is it undersized or any other issue?
4. Also, is it worth spending the extra money for the brand? Will it be so different from others? Bcoz it costed 41,000 incl of everything for this 1.1 ton 5 star. Other brands are so so less priced. Even the good brands like Panasonic are cheaper compared to this.

Your inputs please.

5
Abhishek Jain (Mod)

Hi Arjun,

Your room's tonnage requirement is coming out to be 1.2 ton. So 1.1 ton should work fine, especially because MHI ACs have long air flow. So it should work fine. It should have worked fine. It is quite possible that it is not installed properly. Otherwise 1.1 ton should have worked perfectly fine for your requirement. You should put a complaint with MHI for the same. Does it not cool fast when you keep fan speed high?

6

Hi Abhishek,

Thank you confirming on capacity.
No it did not cool any faster when the fan is kept at high speed. My observation that I mentioned is actually done at high speed. But looks like there is no issue with the cooling as such from the machine. Air is quite cool that is coming out. I will check it once by speaking to the MHI person.

7
Abhishek Jain (Mod)

Can you check the temperature of the cool air coming out? If that is cool enough (between 6 and 10 degrees) then the room should get cooled. I hope the room is packed enough so that no heat in coming in from any point. Are the walls hot? or are the windows open and hot? Is the door closed?

8

Hi, I don't really have any device right now to check the temperature of the air coming out. Will try to ask someone for a device.
Doors at kept closed but there is some gap (about half cms) below the two doors connected to the room. Will now try closing it by with a cloth and check the cooling.
Yes the wall and 2 windows to it are hot as it's slightly north-west and faces heat post noon.

9

Does inverter ac work efiiciently at temp upto 42 degrees and does not cool efficiently above this outdoor temp I live in Jhansi where outdoor temp can go upto 49 degrees its semi arid zone mostly dry round the year with annual average rainfall of 800 mm

10
Abhishek Jain (Mod)

You will have to check the operating temperature of the AC. There are many brand that have ACs that can work easily up to 50-52 degrees as well.

11

India ac 4hrs 8

My india ac 3star 2 unit per hrs bijli consumpson

12

we recently installed a blue star 1.5 ton 3 star split AC (BI-3HW18FBTU) at our residence in Tamilnadu (with max temperatures of around 40c). The room size is 13x09 ft with one exposed wall facing east, situated on the first floor of a 3 storey building. we operate the AC usually from 10 pm to 6 am, at 26c temperature in cool mode. While it does cool the room well, we have been having a few concerns regarding its power consumption. Prior to the installation of AC, our daily consumption was 6 units, which has jumped to around 14 units now (So, approximately 8 units for 8 hrs during night). Additionally, there appears to be malfunctioning of AC in terms of cycle duration. After initially taking around 30 minuites to attain the set temperature, the compressor stops for exactly 3 mins. It restarts and run for 8-10 minutes and stop for 3 minutes .The cycle gets progressively shorter over the next 2 hours to a point where it runs for about 4-5 mins and stops for 3 mins, then starts again. Is this normal functioning l. Your opinion would be much appreciated.

13
Abhishek Jain (Mod)

Hi Sevaraju,

8 units for 8 hours for a BEE 3 star rated 1.5 ton AC sounds quite reasonable. If you wanted it to be lower then you had to go for a more energy efficient AC. Also 9-10 mins cycle is ideal cycle for any AC and if it is achieving that, then it is running at good efficiency. The efficiency goes down as the cycle time goes down. But then you cannot do much about it. Inverter Tech AC would have reduced the electricity consumption. But then this is a normal AC. The cycle time would have been longer if you would have gone for a 1 ton AC (which was ideal size for your room). But I do not think this AC is abnormal. It is behaving how a 1.5 ton BEE 3 star rated split AC would have behaved.

14
Sandeep Chandra

To cover almost 400 sqft hall (domestic purpose) , Usage 3-4 hours a day and for 4 to 5 months ,some friends suggests me to fix 2 acs of 1.5 tons & 5 Star ratings of Blue Star , Model 5HW18ZCWX. Is it right to bought it , pls suggest me

15
Abhishek Jain (Mod)

Hi Sandeep,

Firstly the right tonnage requirement for a room depends on multiple factors like city, room location (if it gets direct sunlight from walls/windows/ceilings etc) and the room size. I cannot comment if 3 tons will be sufficient for your room or not. You can check the same using the calculator on this link: https://www.bijlibachao.com/top-ten-appliances/best-air-conditioner-ac-window-split-hitachi-lg-carrier-samsung-electricity-consumption-tonnage-in-india.html

My guess is that you would need 3 tons or more. So you can certainly fix 2 ACs of 1.5 ton. Blue Star is a great brand and you can certainly go for Blue Star 5 star rated AC.

16

i have an inverter ac lg dual inverter 3 star when i set temperature at 20 in remote the room temperature will be at 23 and if i kept in 23 in remote and room temp will be 26 always 3 or 4 degree difference, is it normal for this type inver ac?? ac technician says its normal but im not satisfied with his ans.

17
Abhishek Jain (Mod)

Hi Chandru,

A lot depends on where you are measuring the temperature. The thermostat of the AC is inside the indoor unit and so you will have to check the temperature at the grill (or close to the indoor unit).

18

thank you for ur reply i kept running the lg dual inverter ac 1.5T for more than an hour in room size 9*9,
i checked the temp in remote for room temperature and also i have a separate thermometer for room temp both shows 3 to 4 degree diff as i said earlier.

19
Abhishek Jain (Mod)

Try comparing the grill temperature.

20
NITYANANDA SARKAR

Can i run my hitachi split ac 1.5 ton, 5 star at 29c mode,?

21
Abhishek Jain (Mod)

Sure you can. There should be no problem.

22
NITYANANDA SARKAR

My hitachi split ac model no RAU518ADV. 1.5 TON 5 STAR. At night I am feeling comfortable to run it in 28c mode. Please let me know will it be harmful for my ac. should i run it at 24c- 25c?. please help me with your suggestion.

23
Abhishek Jain (Mod)

You can run it at 28. There should be no problem.

24

I just recently bought a DAIKIN inverter ac. I would like to know the optimum temperature that is to be set during sleeping at night. I have already used the ac for a few days @ 28 C, which I am finding comfortable. Some people are recommending that operating at such a temperature would adversely damage the compressor, IS IT TRUE?? Plus I'm also aware that the compressor of an inverter ac does not stop operation when it has reached the set temperature and it continues to operate at 21-34% power.

Regards

25
Abhishek Jain (Mod)

Hi Nirmal,

Running AC at 28 degrees will not damage the compressor (specially when it is inverter AC). You can run it at a temperature as high as it is comfortable for you. Ideally we do not suggest to go below 25. So 28 is fantastic.

26

Dear Abhishek
Thank you for your quick response. Further, I would like enquire about another issue. The DAIKIN AC that I'm using "JTKM50SRV16", runs from 12am to 5am and is consuming 1.5-2 units as recorded on the meter provided by CESC (KOLKATA) [Plus there are no other appliances running during that period of time on that meter]----- is such consumption 'ok' for a 5.2 rated ISEER rated inv ac??

Also I also set the off timer at 5am before sleep but do not turn of the starter and the MCB until 8am. Please tell me will such a practise consume any energy for those 3hrs (from 5am - 8am).

Regards.

27
Abhishek Jain (Mod)

Hi Nirmal,

As per the data by BEE for JTKM50, it will consume 744 units in 1600 hrs (this is in test conditions). Which comes to 0.465 units per hour. So in 5 hours it should consume 0.465 x 5 = about 2.3 units. But this is average because electricity consumption is seasonal. And also depends on heat load of the room. If heat load is less, it would consume less as the number is in test conditions. So 1.5-2 units for 5 hours is fairly fine for this AC.

Also if your AC switches off, it will not consume any electricity. It may probably 1W or so for the LED kept on. But not much.

28

What I bought I mean some friends suggest me for 2 ton & 5 stars rating ....
Is it fine ?
Kindly reply me I have to bought it by today & kindly suggest some recommended brands also.

29
Abhishek Jain (Mod)

2 Ton would be small for 400 sq ft space in most cities in India. If you want to cool the whole room, then you would need more. But if local cooling close to the AC is fine with you then you can go for 2 ton as well. Let me know your budget and I can suggest something accordingly.

30

Sir budget is somewhere around 50- 55 K .
Is 5 star is good for my purpose ?
Kindly suggest some good brands accordingly...

31
Abhishek Jain (Mod)

Hi Sandeep,

Hitachi would be the best brand in terms of cooling and energy efficiency. You can look at these models:

Hitachi RAU524AVD (Amazon Link: http://amzn.to/2pXTUo5 )
Hitachi RAU524MWD (Amazon Link: http://amzn.to/2pY2PWJ )
or you can look at Blue Star 5HW26AAX ....

These are ACs with BEE 5 star rating and highest in cooling capacity.

32

Hi Abhishek ,

Pls suggest me the AC for 400 square feet hall....kindly revert me in priority am in hurry.

33
Abhishek Jain (Mod)

Hello Sandeep,

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

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

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

34

hi,

I have voltas ac of 1.5 ton. I just wanted to know what are the steps to set the compressor will start again when the thermostat detects that the temperature has increased.

Please do reply me.
Thanks.

35
Abhishek Jain (Mod)

There should be no manual step needed to do that. Your AC should automatically start when the thermostat detects that the temperature has increased.

36

But how first we need to set then only it will work automatically

37
Abhishek Jain (Mod)

Just press the "on" button and it will work automatically.

38

Using inverter ac . when i set temperature at 27 degree it runs at 27 for few hrs then it goes up to 23 and then coming down , not always but some times . i dont use swing . i check temperature on my ac remote which is kept direct ac air flow.

39
Abhishek Jain (Mod)

It should not happen like that. I would suggest that you log a complain with the manufacturer.

40

I have a cyber cafe with Ac 1.5 ton and 3 star rated, Can I on the Ac only when the customer comes in and when the customer is not there, can I off ... will there be high impact on the bill if I do this .. Please reply

41
Abhishek Jain (Mod)

As long as it is not too frequent (like every 5 mins), it should be perfectly fine as long as the customer is comfortable :). Because when you switch it off the shop will become hot.

42

Hi i have 1 question,I have 1.5 Ton fixed speed split AC, Recently I found my AC is not chilling the room as it was doing earlier on 24 degree. Today I took thermometer from local ac mechanic and test the room temperature,I have set my ac at 24 Degree but it cutoff at 24.8 degree and started again at 27.4 degree is it normal? or it should be cutoff at 23 Degree ? should i complain to service centre for this? I stay in Jogeshwari(W),Mumbai.Please reply.

43
Abhishek Jain (Mod)

Hi Faiz,

Did you try getting the maintenance done for the AC? Usually dirty filters, etc cause cooling performance to reduce.

44

Yes i have cleaned my filters. But I want to know how sensor work I heard if we set temp to 24 ac should cutoff at 23 is it true?

45
Abhishek Jain (Mod)

It should cut off below 24. Not above 24.

46

Thanks Abhishek. It means my ac sensor is not working properly will lodge a complaint. Thank you so much.

47

What is your take on ACs in Multi level buildings? Especially in IT offices.

48
Abhishek Jain (Mod)

A VRV system works great in a multi level building.

49

kindly suggest best power saving and long life performance with lowest maintenance ac with suitable tonnage for 9*9*9 room in airoli navi mumbai, my room is on 2nd floor in 5 storage building 1 wall with window is facing east so sun rise to noon it is taking direct sunlight, usually we will be using ac at night only, as nobody at home whole day, once or twice in a week day use. Kindly suggest brand and model.

50
Abhishek Jain (Mod)

A 0.75 ton AC would be more than enough for the room. Airoli would be slighly corrosive area as there are chemical factories due to the thane belapur belt. I would suggest copper condenser fixed speed AC. I would say, any of these would be good:

Mitsubishi Heavy SRK10CRS-S6 (this will have better air flow and so better coverage of the area)
Mitsubishi Electric MS-GK10VA (Amazon Link: http://amzn.to/2pJvFYX )
Blue Star 5HW09SAFU (Amazon Link: http://amzn.to/2pckRl6 )

51

thank you abhishek sir for prompt revert, no inverter is required ? stabalizer is recommended? as here electricity cutoff. how about ac from new companies like micromax

52
Abhishek Jain (Mod)

You can go for inverter AC if your environment is not very corrosive. I have a 0.75 ton inverter AC from panasonic in Powai which I have been using successfully for past 4 years now. But then I have heard complaints of PCB failures from people living close to the sea where direct winds from sea causes corrosion. So if the area is corrosive, I usually do not recommend Inverter AC. Only when the area is not corrosive, do I suggest going for inverter AC. If you want to go for inverter AC then you can look at these:

Blue Star 5CNHW09PAFU (Amazon Link: http://amzn.to/2n5TMS0 )
Daikin FTKP25 (Amazon Link: http://amzn.to/2p6E4IU , Flipkart Link: http://fkrt.it/GNdWcTuuuN )
Blue Star 3CNHW09CAFU

Stabilizer is usually recommended when there are lot of voltage fluctuations. Power quality is quite reliable in Mumbai and usually Stabilizer is not required in Mumbai. If you feel that you get voltage fluctuations in Airoli, then you can go for a stabilizer. You can check this page for voltage stabilizers: https://www.bijlibachao.com/appliances/voltage-stabilizers-buying-guide-best-tv-ac-fridge-home-guide-india.html

As for micromax, I would say that based on data, they are not very energy efficient. And then they do not have 0.75 ton AC. In fact they do not even have a 1 ton AC. They only sell 1.5 ton ACs and those would be highly electricity consuming in your case.

53

what are the consequences if for smaller room size we install more tonage AC for 9*9*9 1 TON or 1.5 TON AC

54
Abhishek Jain (Mod)

Oversized ACs: 1) Consume more electricity 2) Are not effective in removing humidity. If you go highly oversized like 1.5 ton then you will also observe bad odor from the AC. And on top of it you pay more to buy it.

It is like if you need a car and you purchase a truck. Truck consumes more fuel, and costs more!! And you have loads of space left in truck which is unused.

55

sir can I go with these 1. ac Cruise 1 Ton 3 Star Split AC (Copper, CWCACC - CQ3CN123, White) 2. Hyundai HS4G33.GCO-CM Split AC (1 Ton, 3 Star Rating, White, Copper) they are on amazon can I order it online , is it safe ?

56
Abhishek Jain (Mod)

You can certainly buy online. Just make sure that the seller rating is good on Amazon. I checked the ratings:

For Hyundai Model here is the link to seller ratings: http://amzn.to/2rdyzEO ....I can see only 1 seller for Mumbai and his rating is 46% (kind of low).

Cruise model comes from Reliance Digital Express (Seller Page: http://amzn.to/2rdqW1t ) .... the rating is good. So I think Cruise model is safe.

57

Hi,
I have purchased 1.5 ton window ac for my 12*13 room in Gurgaon (Roof is covered by top floor and sun light faces only one side of room after 2 PM , is the tonnage correct in over/undersized, I am planning to move another place in noida , which has 10*10*9 ft bedroom , so is my AC oversized for it.

58
Abhishek Jain (Mod)

For your current room it is rightly sized. But it will be oversized for your next room. For the other room anywhere between 0.75 to 1 ton is good.

59
Abhishek Trivedi

Hi Abhishek,
Does the compressor automatically on and off after some time ? Is this normal procedure?

60
Abhishek Jain (Mod)

For non inverter AC, yes it is a normal procedure.

61
Senthilkumar Shanmugam

Hi, In my room i have a daikin 1 ton inverter Ac, What is the ideal temp for inverter type ac, 25 feels too cool for me, If i set my ac to 28, will i save more electricity.

62
Abhishek Jain (Mod)

You will certainly save more electricity if you keep it at 28.

63

Thank for this article I was looking for ways and reason to why my electricity bill has increased this year. I landed up on your website. After reading the article and comments. I put my AC on 24 C temperature. And its the same feeling I was getting when It was on 16C. I don't know why I was putting it at the highest temperature. I am hoping this itself would reduce my bill
I have a few doubts though could you please clarify. I have an old LG 1.5 ton Window ac(room is 10x10 feet) I was able to keep my ac bill around 3000(normal bill is 900 to 1200 w.o ac) and in peak summer 3500 per month. I used to use an energy saving feature on it. Where if you turn it on the AC will automatically switch off totally when the desired temperature was reached.
If i kept it around 26 It would sometimes work but sometimes the rest of the room wont get cooled. It would turn off as the temperature near the ac would reach 26. I tried keeping fan slow it would work sometimes. If I keep it at 24 it would turn off after long time. Now I just keep a timer for 2 hours or 3 hours and then hope the temperature stays ambient till I wake up.
For some reason doing the same this summer got me a whopping bill of 3700 rupees. I have been keeping it on for around 6 hours a day(at 16C) Otherwise normally I get around 2700 then 3000 and the peak month around 3500.
I am scared that in the next month it will cross more than this.

My First question is Now will keeping it at 24C reduce my power consumption.?

I just noticed that after keeping in on 24C even though the AC is not energy saving mode(which for some strange reason can only be turned on from the remote) there is a change in the sound of the AC after a few minutes. I sit next to the AC and am noticing that the air is not that cold. But the fan is still running.
So it seems like the compressor or the cooling part has been turned off.
Is this good?
Or is the energy saving mode better? In the energy saving mode the entire AC turns off with the fan. But it turns off after long time and only if the fan is kept slow. Here in the normal mode the compressor seems to turn off and turn on at equal intervals it seems like after 5 minutes it turns of the compressor for 5 minutes. The fan is running all the time.
Second question is is this normal better or is the energy saving mode better where the AC will totally switch off but at longer interval and it gets turns of pretty fast especially if fan is even in Medium.

Third question Is to confirm what my AC guy said.
he told me my Ac is using 8amps power. Its too high he told me to change the ac. Last year it was using 6amp. He told me a split ac will only use only 4 or 5 amps. So my power bill will become half.
Is this true? Will a split AC give so much efficiency.
Also My room is 10x 10 and the ceiling high is 10feet I had asked him if a 1 ton AC or a .74 tonn ac is enough. He says I need 1.5 tonn.

I still did not go in for it as my logic was that I have to spend 15K which he said uses only 5amp.
If this would even cut my powder bill by half. I would be saving 1500 per month max
That would take me 10 months to recover my 15k That i put to purchase. I use the ac only for 3 months a year. Maximum you can say 5 months As I use it for for another six month but the bill only comes up to 1k extra So I would be saving only 500.
Even if I ended up saving with a 5 star ac a new one 2k It would still take 15 months to recover the money put into my AC.
SO I decided to postpone it till I move out of my house. Which I would shortly and then invest in a nice 5star costly AC that would at least run for a couple of years so that I am able to recover the cost in saving and also get extra years savings.
Is my logic correct.? I had to spend 2500 rupees for servicing of the ac fill gas etc. This is when he recommended I don't do it and spend 15K instead.

Thank you

64
Abhishek Jain (Mod)

Hello,

First and foremost, your AC is oversized. I do not think you need more than 1 ton AC for a 10x10x10 room in Mangalore. In fact I think 0.75 ton will also be better. Because 1 ton is required for 100 sq ft room in Delhi where the climate is much hot. So in your case I think even 0.75 ton would be better. And oversized ACs do consume more electricity.

Also you will save electricity if you keep your AC at as high temperature as it is comfortable. So if you keep it at 26 and it is comfortable, then it would be the best. If you can go higher, it would be better. But because your AC is oversized, keeping it at higher temperature would result in short cycle and that would also reduce the humidity removal capacity of the AC and increased humidity can cause bad odor. So you will have to manage temperature in such a ways that you can keep it high and also avoid bad odor.

As for energy saving mode, I think it is a good mode where the AC is completely off for some time. But then it may lead to increase in temperature in the room which may not be very comfortable.

In the market you can get inverter technology split ACs which would be about 50-60% more electricity saving that your current AC. In fact you may even go for 0.75 ton inverter AC which would be hugely energy saving for your room. But then it would cost about 30K to get a new AC. But you will certainly notice a huge difference in your electricity bills.

Also in any house the electricity consumption of various appliances go like this:

1) AC is the highest contributor to electricity bills.
2) All Fans together are the next highest contributor.
3) Refrigerator can be a third big contributor specially if you have a big one.
4) Water Heaters/Geysers are 4th biggest contributor (or can be 3rd if refrigerator is not big).
5) Lights and other appliances are the last.

If you can tackle first 3-4, then you can bring down your electricity bills by huge quantity. There are energy efficient options for each of them. And the most efficient options can save 50-70% on each.

65
Mangalore Cafe

Hi,
Thanks for the prompt reply. BTW I am from Mangalore But living in Surat. Temperatures can reach 40 and above in peak summer.Its been 2 days Since ur message and no odour problems.
I have a tip to take care of odour I simply buy some pure camphor powder. I just throw it into the the ac It sits between the grill and the filter and it purifies the entire room and keeps the AC also from smelling due to bacteria overgrowth.
I will put it on energy saving mode and see how it fares.

Thanks for the confirmation I knew that a 0.75 ton AC would suffice. I wonder why these AC mechanics and Seller recommend Higher ton AC. In some places they recommend 2 tonne acs where I am sure only 1 ton is enough.

I just wanted to confirm will a 0.75 ton window AC give me a reduced power. I have seen models with 5 star and 3 star rating But I am not sure how easy it would be to procure it. They cost only 20K There is a bluestar 2star AC for 19k Will this 2 star and I have seen other 1 star ac give me at least 50%

66
Abhishek Jain (Mod)

Window ACs are outdated. They do not have latest and efficient technology. It will be better if you can go for a split AC of BEE 3 star or above. Inverter AC would be highly electricity saving and comfortable as well.

67
Mangalore Cafe

Thanks a lot I think I should think about investing in it.

68

Dear sir,

I recently bought an AC. The installation guy who came kept on telling me to keep AC temperature in odd figure. He gave me a reason that, in odd figure power consumption would be reduced. Can I believe that.?? Being a service centre guy telling me I was concerned so I took the matter to you.

Thank You

69
Abhishek Jain (Mod)

There is no logic behind keeping temperature at odd figure. You can reduce power consumption by keeping the AC at a temperature as high as it is comfortable to you.

70

Thank u sir

71

Hi, I have an Electrolux Split AC 1.5 ton bought in 2015. I used to live in Gurgaon where my room size was pretty small as compared to my current living place, As I have got it installed this season, it is taking longer periods to cut off the compressor and runs for almost 1,5 hrs. I have called up an electrolux engineer and he told me it is of no issue and it happens because I have a sun facing apartment and the size of my room is bigger than previous one and my outdoor unit is in the place where it gets sunny in the noon time. Earlier my AC used to take cut cycle of 20 mins or 30 mins extended to 1.5 hrs now. I am worried about the same. How can I prevent it? Will it consume more energy now?

72
Abhishek Jain (Mod)

Hi Sunny,

Do you mean that the compressor now shuts off after 1.5 hrs? That's a real long time and it would certainly mean it would consume more electricity. What is the size of your room now in Gurgaon?

73

The cycle of taking cut offs of outdoor unit I meant

74

14ft by 14ft and height 12ft, yes it takes cut off at 1.5hrs.. i do not understand why? any help would be appreciated

75
Abhishek Jain (Mod)

Hi Sunny,

Based on the information you have provided, your room needs 2.5 tons of cooling in peak summer day time. So it is very well understood that cut off will be quite long. It will certainly consume more electricity than what it used to do earlier because the load on it is much higher. Also the outdoor unit is facing the sun which make it more difficult for the AC. So all in all, the performance has taken a hit because the heat load is a lot more.

76

Hi abhishek,
I am from delhi and have voltas executive split ac of 1.5ton
My room size is 10x14x10 feet
14 x10 feet wall is sun facing and absorbs heat whole day. Similarly 14x10 feet roof exposed to sun whole day as room is on top floor.
My room ambient temp. Comes to around 37 degree and out side temp is 42. My ac drops the temp by 8 degree in 30 minutes and further 2-3 degree in another 30 mins or so. In all temp drols from 37 to 26 in one hour or so. But after that it struggles to drop temp further and brings down only 1-2 degree after running for couple of hours.
Grill temp. Is about 12-13 degree.
Is my ac working ok and heat laod is too much to reduce the temp further.
In nut shell my my ac drops only 12-13 degree lower than room temperature irrespective of outdoor temp. Pls advise
Regards
Kunal

77

Thx Abhishek. I agree with you.
But my in peak summer room temperature goes as high as 38_39 degrees and than ac struggles to bring the temperature to 28-27 degrees even after running it for 2 hours or more. Is it due to extreme heat or there is some issue with C due to which it manages to reduce pnly 10_11 degrees only at any point of time.
Also at the outer unit temp of both the lines (sucction line the wider one and liquid line the narrow one) are indetically chill. I have read some where that liquid line should be warmer. Is that an issue

78
Abhishek Jain (Mod)

You can try reducing the heat in your room by getting the roof painted white (with chuna) on top if you have access to roof top. This will significantly reduce the heat in the room. If you do not have access to the roof then you may put a XPS (Extruded Polystyrene) thermal insulating board on the inside on the ceiling. This can act as false roof and can also reduce the heat in the room.

79
Abhishek Jain (Mod)

Hi Kunal,

As per my calculations your room needs 1.5 tons cooling (exact 1.5 ton) or max 1.6 ton if the walls also get heated up (along with the roof). Now I am not sure which executive split AC do you have (they have window models and split models of 2 star, 3 star and 5 star ratings), but I checked the various models and found that the 2, 3 star rated models (both split and window) have cooling capacity equal to 1.37-1.38 tons. And their BEE 5 star rated models have cooling capacity of 1.43 tons.

Whatever be the model, its tonnage may be a bit small for the room's cooling needs. And that may be the reason that it is not able to bring down the temperature in peak summers to 25.

And the gas line should be warmer because the refrigerant will take heat from the room and the liquid refrigerant will convert to gas. But liquid refrigerant coming in should be cool.

80

Hi abhishek,
Many thx for your reply.
Its volats Ex AY 185 5 STAR MODEL.
YES In peak summer my room feels like tandoor and specialy in the evening when outside temperature falls, rooms temp still remains high due to heat absorbed by roof and west sun facing wall. Also my room do not have proper ventilation.
But from your reply i understood that ac is fine and romms is getting excessive
Heat.
Thx

81
Abhishek Jain (Mod)

Hi Kunal,

Firstly I think 24-25 is more than comfortable temperature. Ideally when an AC is sized, the calculations are done in such a way that the AC tonnage is such that it should be able to bring down the temperature of a room to 25 degrees. So if your AC is able to bring down the temperature to 25, then I think it is right sized. I think 1.5 ton should be good enough for 140 sq ft room in Delhi (even the one with hot roof). Frankly I do not see much of an issue with the AC.

P.S: There are people trying to come up with laws internationally to keep default minimum setting in ACs to 25 degrees and not lower than that :). Because this is temperature which is quite comfortable and the AC does not consume a lot of electricity.

82

Water droping from my ac inside bedroom for the first time. Installed ac before 2 months. why is it ?

83
Abhishek Jain (Mod)

Your installation was not proper and the water draining pipe may have clogged or choked in such a way that the water is not going out. Ask the engineer to check drainage pipe.

84

I bought a Lloyd LS13AI 1 ton inverter AC for my child bedroom. It was installed yesterday. I have a couple of questions.
1. The outdoor unit is kept below the level of indoor unit. Is this an issue?
2. Outdoor unit is exposed to direct sunlight in the afternoon time since it's placed under the west side window. It's under a sunshade, however I think it's still exposed. Is this an issue?

Thank you for the help in advance.

85
Abhishek Jain (Mod)

Here is my response:

1) It should not be an issue.

2) It is better that the outdoor unit is not exposed to sun. A lot depends on the operating temperature of the AC. If it is 46 and the temperature in your city goes to 48, then the outdoor unit may not work in peak summer (especially when exposed to direct sun). If it is 50 or 52 then it should work without problems. Check the user manual.

86

Ok..Sure..Thanks for your help!

87

I want to connect with you because I have multiple queries. Can you please share your mobile number so that I can call you.
I would really appreciate if you can offer your help.

88
Abhishek Jain (Mod)

Hi Harsh,

It would be good if you can write down the queries over here. We will reply to all of them. We do not interact on phone (if we do then our phone will never stop ringing).

89

hello Abhisek,
I have 1 Ton 3 star Voltas split AC bought in 2009. Since last 1 year it has developed a peculiar issue. Out door unit cut off at 27 but never cut off 26, 25, 24 or so. I have got the service done regularly and it gives good cooling for my 120 sq ft room. Is Thermostat is faulty? if so how can I change it? any other possibility for this issue ? pls guide

Thanks

90
Abhishek Jain (Mod)

ACs derate with time which means their preformance degrades as time passes. It is low in some brands, high in some other. But derating happens in every AC. It is quite possible that the performance has degraded with time. Can you check the grill temperature (Temperature of Air close to the AC) and compare that with temperature setting. Can you check if the AC is able to reduce the temperature to the levels you have set?

91

Hi.. I have purchased daikinGTC50SRV162 3 star 1.5 ton split AC with eer 3.25 in my room size 12*18 ft.... I generally use it at temp 25But it sometimes smell bad and how much units does it consume ...

92
Abhishek Jain (Mod)

Smell can be either because the AC is oversized (you put 1.5 ton when you need 1 ton) or the compressor is not running long enough. Try keeping it at lower temperature and see if the smell is still coming. Is it is new AC? In effective removal of humidity can cause mould and mildew to grow which can cause bad smell from the AC.

93

This AC was brought from a store but when I searched online this model of daikin gtc50srv162 is not available online... Pls guide me... Weather shopkeeper given me genuine AC or not???

94
Abhishek Jain (Mod)

Just noticed that BEE has included Daikin GTC50 in its list. So it is a valid model.

95
Abhijit Shrirao

Thanks Abhishek

96
Abhishek Jain (Mod)

Hi Abhijit,

I am sorry I cannot say anything on this because it is possible that Daikin has come up with a new model and they may update their website later. But there is no proof online for existence of such model.

97

Yes... It is new AC manufactured in January 2017
I am now using AC at 23 and now there is no bad odor

98
Abhishek Jain (Mod)

Use it at lower temperature as I guess it is a bit oversized and is not able to remove humidity effectively. The compressor needs to run longer to manage the same.

99

Hi Abhishekh i have voltas window ac.. outside temperature at my place is 43 now it will go up i m confused what mode i should setup for room for cooling nd comfort level

100
Abhishek Jain (Mod)

You can use the cool mode on the AC. That should be fine.

101

Hi Abhishek,

Need your advise, I'm staying in Jabalpur & looking for inverter AC's. Room size is around 200 sqft. I'm confused between 2 ac's @ the moment. Can you recommend which ac is easy on wallet & best to beat the summer & winters...

1) Daikin FTHP50 , 4 STAR ( Have both features hot & cold but cooling limit is max 46. Will this be effective if outside temp goes above 46? Is it a good
choice considering other options in market? Will this consumes less electricity?

2) Daikin JTKM50 , 5 STAR ( Have only cooling feature but also have cooling limit as above & misses out on heating option)

102
Abhishek Jain (Mod)

Hi Ujwal,

JTKM50 is top of the line model from Daikin which is a premium brand. So it will not be easy on wallet to buy. If you are looking at inverter models easy on waller then you can look at these:

LG JS-Q18ATXD (Amazon Link: http://amzn.to/2plxzkK )

LG JS-Q18AFXD (Amazon Link: http://amzn.to/2oA2VBg ) similar model with different design

LG JS-Q18CPXD (Amazon Link: http://amzn.to/2oA7Ban ) ... this is an Amazon only product and I doubt you will get this in market.

LG JS-Q18NPXA (Amazon Link: http://amzn.to/2oA6Nm5 )

Godrej GSC 18 MINV 3 RWPM (Flipkart Link: http://fkrt.it/4zbS3TuuuN )

Voltas 183V EY (Flipkart Link: http://fkrt.it/4zTJATuuuN )

Blue Star 3CNHW18NAFU

Daikin FTKH50 (Flipkart Link: http://fkrt.it/PsYIxTuuuN )

Whirlpool EZ FANTASIA INVERTER COPR 3S (1.5 T) (Flipkart Link: http://fkrt.it/xM!vQ!NNNN )

103
Abhishek Jain (Mod)

If you wan to go for hot and cold then FTHP is a good choice.

104

Thanks Abhishek, I've finally decided to go with FTHP.

105
Abhishek Jain (Mod)

Great! Do let us know your feedback on the same.

106
Abhishek Jain (Mod)

Hi Gaurav,

46 degrees is operating temperature of the AC. Which means if the temperature of air surrounding the AC goes beyond this, then the AC may not work. It can be avoided by keeping outdoor unit in a shaded area and avoid direct exposure to sun. FTKH is an old range from Daikin. Their newer ranges that are BEE 4 star rated inverter have operating temperature up to 50. Also there are many other brands that have good operating temperature range in BEE 3 star rated inverter (e.g. Blue Star).

Also a jump from BEE 3 star inverter and BEE 3 star inverter does not make a whole lot of sense in terms of electricity consumption. Because in terms of energy saving (electricity consumption) BEE 3 star inverter would be equal to BEE 6 or 7 star rated non inverter. So if you want to go for non inverter, better go for BEE 5 star rated non inverter. BEE 3 star non inverter would be like going for the least efficient AC in the market.

107
Abhishek Jain (Mod)

Hi Kunjan,

Assuming that you have rightly sized your AC and it does need 1.5 tons of cooling in peak summer, FTF has annual electricity consumption of 1103 units for 1600 hrs (ideal state). Which means at 25 degrees per hour consumption would be 1103/1600 = 0.69 units of electricity. But at 20 degrees the consumption would be 20% more so it would be 0.69 * 1.2 = 0.83 units per hour.

108

Thank you so much brother
One more thing
What is FTF?
My model is ATF and how do I find the annual electricity consumption of my model?
Is it written somewhere?

109
Abhishek Jain (Mod)

Annual electricity consumption is written on the BEE label. It should be there on your AC. Also ATF and FTF have same technical specs. ATF has some extra features like filters and smart phone connectivity.

110

On my ACs eer label, it is written
Cooling capacity(W):5200
Power consumption(W):1425
Does it mean it consumes 1425/1600=0.89 units per hour?
I guess thats quite cheap

111
Abhishek Jain (Mod)

I am sorry, you have a fixed speed compressor model. And the label of fixed speed compressor models do not have annual electricity consumption. Only the variable speed (inverter ACs) contain annual electricity consumption. Although BEE does publish annual electricity consumption data on it's website (for both fixed speed and variable speed models). You can check the same on this link: https://beestarlabel.com/Home/Searchcompare .... check Schedule 3 for the ACs (3rd image from top).

112

Does this mean my AC will use 1103.1 units (kWh) for 1600 hours annually ?
And how many degrees does this count?
And one last thing, what does the valid till means?

113
Abhishek Jain (Mod)

Validity is for Star ratings. After the valid date if they still want to sell this model, they will have to again get a BEE certification for the model.

The annual electricity consumption is just a representative number where an AC is tested in ideal conditions (and at 25 degrees). But in real life, the conditions are not ideal and the temperature is also not same (both outside the room and on thermostat). It is just impossible that same model used in Delhi would consume the same electricity for same amount of time in Mumbai. The conditions are different. And it is impossible for anyone to give you exact number. So this is just a good representation so that you can compare two models.

114

Bhaai I just bought this awesome Daikin ATF50SRV162 1.5 5star split ac for a 225 sqft room.
It cools really fast and right now I use it on 25 at night for ~2 hrs and sometimes in the noon at 20 for 1/2-1 hr.
I live in south Mumbai and I was thinking how much units will this ac consume per hour on 20 and 25 both.
I tried to calculate but I can't even a good approximation.
Your help might help me more.
Thank you

115
Abhishek Jain (Mod)

I would suggest that you monitor your energy meter for the house. Switch off everything in the house and switch on the AC. In an hour you will get to know how much it consumed. ACs consume so much electricity that energy meter itself moves faster. Telling you the exact number would be extremely difficult.

116

Hi Abhishek,

Few questions..

I have seen in all AC when the compressor cuts off the fan only blows air and that air is really not pleasant. it has some odour in it eventhough i cleaned the ac properly...Is there any ac model which does not cut the compressor off or when it cuts the fan totally stops? because in my opinion the fan blowing just dirty air is not necessary and its better if it doesnt blow at all..

My AC has cool and dry mode ...whats the purpose of dry mode? does it remove humidity in the room?

117
Abhishek Jain (Mod)

Hi Joe,

Odour usually comes when the AC is oversized and it is not able to remove humidity effectively. If your room needs 1 ton and you put a 1.5 ton, then it will certainly happen. You can go for an AC with inverter technology compressor and that will automatically adjust its tonnage based on the need of the room and then it will not cause odour.

Dry mode is to remove humidity.

118

thanks for the reply..my Ac is 1 ton and my bedroom is 11(l) x 10(w) ft. Is that the correct size for my room? I set the fan speed to lowest level ..the problem happens only when the compressor cuts off...In my place humidity is less than 40% and Ive set it to cool mode at 26C..

Should i set to dry mode to remove humidity since you said the AC is not able to remove humidity? confused a bit..

119
Abhishek Jain (Mod)

Depends on the city and room location. If you are in Mumbai or any city where temperature in summers does not go beyond 33-34 degrees, then 1 ton may be slightly oversized. But if you are in Delhi, then it may not be. You can check the same using the calculator on this page: https://www.bijlibachao.com/top-ten-appliances/best-air-conditioner-ac-window-split-hitachi-lg-carrier-samsung-electricity-consumption-tonnage-in-india.html

When the compressor is running it is removing the humidity, when it cuts off, there is no humidity removal, and I guess the humidity is more in your room that what the AC is removing. You may have to decrease the temperature of the AC or increase the fan speed so that more air circulation happens and more heat has to be removed making compressor run longer.

Have you tried dry mode? If not then you should, because ideally in dry mode, the priority is to remove humidity.

120

Hi Abhishek,
My AC has been cleaned and its better than before, But Is setting to Auto mode detects the humidity and automatically work in dry mode? Or should i specifically set to dry mode to remove humidity? Because when i set to dry mode the compressor cuts off sooner than in cool mode..So im not sure if theres more humidity in my room since you said "When the compressor is running it is removing the humidity, when it cuts off, there is no humidity removal,"

Also I noticed if i open the room door the compressor is not cutting off sooner, Is that a good idea to open the room door and letting the compressor to run for a longer time? will it damage the compressor...?

121
Abhishek Jain (Mod)

In Auto mode, the temperature is preset and the fan speed is varied automatically to keep the comfort level. Dry mode should be better to remove humidity. It seems like mold or mildew has grown in your AC (indoor unit). And that is why cleaning helped. Try using a cleaner something like this one on Amazon: http://amzn.to/2p0c3BR .... use it to clean the indoor unit. Make sure you use the blower of a vacuum cleaner to blow things out.

So the refrigerant comes into the indoor unit (evaporator) in a liquid state. It takes the heat from the room and converts from liquid to gas. When it takes the heat from the room air, the water vapor in the air also condenses (and that is what gets drained out from the pipe). When the compressor stops, there is no liquid refrigerant coming in the evaporator, and thus no cooling is happening and so no water vapor removal happens. And that is why I mentioned "When the compressor is running it is removing the humidity, when it cuts off, there is no humidity removal,"

122

Hi Abhishek,

Im sure my AC is oversized for my room, bcoz even after cleaning thoroughly and after using it for 4 days with room door closed the compressor cuts off quickly(with in 5 mins) and I guess the humidity removal is not done so the AC stinks again..the fan also throws tiny water drops back in to the room.

So I tried to open the room door which leads to hall and ran the AC, this time it didn't cutoff quickly and ran for about 15 mins to 20 mins..I think only after opening my room door the AC is operating at the correct room size and the comfort level is good than room locked..

1) So Is it ok to run the AC like that? will it damage the compressor?
2) Also Can i run the fan mode alone for 3 to 4 hrs to remove that smell from the coil? Will that help?
3) Should I set the air flap to fixed position or in oscillation? which is effective?

123
Abhishek Jain (Mod)

Here is my response:

1) I think it should be fine to run like that. It will not damage the compressor.

2) I do not think running in fan mode will help.

3) Oscillation is better for good air circulation.

124

Thankyou for the awesome explanation that makes a lot of sense...

Another question , In Software companies they use centralized AC right? so fresh air is also coming in correct? thats why we dont get fatigue in offices whereas if you sit more than 3 hrs in a car we get fatigue..

Why cant we allow the same fresh air in to room ac? Is that a different mechanism?

125
Abhishek Jain (Mod)

AC cannot work by getting fresh air. If it will get fresh air, its compressor will keep running at peak capacity all the time and even with that the room may not get cold enough. AC is like a refrigerator, keeps an enclosed space cool. AC does not work like an air cooler which takes hot dry air from outside, adds moisture to it and makes it cool. If you want fresh air then you will have to go for air cooler.

126

It seems that my AC has full of dirt inside that round fan which is impossible to clean without a professional..So I called for the service guys and they will come tomorrow..will post back how it does after cleaning...

127

Hi sir..I bought LG dual inverter 1.5ton 3*(js-q18nuxa).Does normal 5* AC equal to 3* inverter??How many units does it consume?? Im using 8hrs(night) @26c.thanks in advance

128
Abhishek Jain (Mod)

BEE 3 star inverter would be slightly better than normal 5 star. The reason being, AC that you would purchase would mostly (most part of the year) be oversized for the room requirement if you have sized the AC properly. And in case of oversizing, Inverter AC saves more electricity. This AC is rated to consume 1040 units for 1600 hrs of usage in a year.

129

And it is ISEER 3.68

130
Abhishek Jain (Mod)

In that case it would be 1092 units in 1600 hrs. So 163 units in a month.

131

Thank you sir

132

Thank you sir...So how many units does it consume in a month for using 8hrs a day??Sorry if it sounds dumb

133
Abhishek Jain (Mod)

1040 units for 1600 hrs so (1040/1600)x8 = 5.2 units for 8 hours and for 30 days it is 5.2 x 30 = 156 units.

134

Hi Abhishek,
There is confusion on the choice of inverter ac 1.5 Ton. Samsung and LG are quite identical in their features. But they dont have copper coil.
Samsung AR18MV3HETQ, LG JS-Q18AUXA or LG JS-Q18NPXA and Voltas 183VEYA. ISEER is ~ 3.6
Hitachi, Daikin are good but costly. The general suggestion i received is to go for a 3 star inverter ac for home use.
I searched that the LG model has a low dB value and good, but am told Samsung is a newer model with more filters and more warranty.

My friend has a Voltas 1.5 T BEE 5* non-inverter. It is used at 28 degrees all night. Also uses it with a ceiling fan on. Is that a good way to use ?

Anyways i am really confused and if samsung/Lg offer same features for a Inv ac i dont see the need to buy a Hitachi/Daikin with copper spending 15k more.
Please let me know your recommendations.

And Your website is an excellent source for many queries. Thankyou.

135
Abhishek Jain (Mod)

Hi Ram,

LG does have BEE 3 star rated copper inverter AC. You can check LG JS-Q18AUXA (ISEER of 3.86). I am not able to find it on Amazon or Flipkart to give you a price/link of the same. Any LG model with "U" in the name has copper.

Also Godrej GSC 18 MINV 3 RWPM (Flipkart Link: http://fkrt.it/wjh!h!NNNN ) is a copper model with ISEER of 3.79

Voltas 183V IY (Amazon Link: http://amzn.to/2n986GN ) and Voltas 183V EY (Flipkart Link: http://fkrt.it/wLU0C!NNNN ) are also copper with ISEER of 3.7

Blue Star 3CNHW18NAFU with ISEER of 3.67 is also copper. All these are BEE 3 star rated ACs with copper condenser.

Keeping AC at 28 is great way of saving electricity. Also if your roof does not get direct sunlight, then using ceiling fan is also better.

136

Thanks Abhishek for the reply. All the choices you suggested are good models. I am under the impression after discussions that copper isnt a must for my area.
I have narrowed down the options to LG JS-Q18NPXA or LG BSA18BEYD. Hopefully there are no issues with either of these 2 models. Thanks again for helping me out. :)

137
Abhishek Jain (Mod)

Great. LG BSA model is BEE 5 star rated while the JS model is 3 star rated.

138

What will happen if I set my AC Temperature at 28 degree Celsius. Will it save in money or not

139
Abhishek Jain (Mod)

It will certainly save money. Higher the temperature that you keep, more will be the savings.

140

Am using inverter ac 1.5 ton . when my set temperature reaches i.e 25 degree after few mins it reach 24 degree and come down to 25 again , then there is a cut off for 40 to 50 seconds or a little more . Is this cut off normal for inverter a.c ? and next my room don't get enough cool when I set temperature at 25 degree my room size not so big am sure 1.5 ton is far more enough. what's ur explanation for this ? ( my outside temperature is almost 30 to 32 degree when I side my a.c to 25 degree.

141
Abhishek Jain (Mod)

Inverter AC should not cut off unless the outdoor temperature is same as indoor temperature and there is no heat to remove. Usually the temperature that the AC measures is the temperature at the grill (or the indoor unit).

Also ACs are usually meant to cool only 1 room and not two rooms. It is not like an air cooler. The impact of AC usually is about 10 ft from the indoor unit (or a bit more if it is a 2 ton AC). So the cold air from one room will not go to the other room. And in general it is not advisable to keep a room open while using AC (for effective cooling and low electricity consumption).

142

Yes there is a cut off when it reaches out side temperature . My ac model LG JS Q18AUXA. some times if I set temperature at 26 degree at afternoon I can see compressor cut off. Why my ac always cut off at 26 degree even at night or noon ?

143
Abhishek Jain (Mod)

Depends on outside temperature. And it is surprising because my inverter AC does not cut off at 26-27. It usually does when it is set to 27-28 at night (not at noon). Because in Mumbai at night the temperature comes down to 28-29 outside and so setting the AC at 27-28 does cut it off at times. But in noon when outside it is 34, it does not cut off.

144

I made a call to LG ( Tamil Nadu Regional ) chief engineer and Samsung Chief Engineer , they both said cut off is very common on inverter a.c @ high temperature that is above 26 degree . Last night I checked my ac with 24 degree where there is no cut off until I made some customs settings to e - saver mode after 6 hrs. E - saver mode keeps on increasing the temperature for every 1 or so and they settled at 26 degree final where cut off take place and some times I can hear the fan runs very slow just not too over cool the room.

145
Abhishek Jain (Mod)

The compressor will stop when there is no heat to remove from the room.

146

So is it noting harm when compressor off due to no heat to remove from the room ?

147
Abhishek Jain (Mod)

Yes. There should be no harm with compressor being off.

148

i purchesed a mistubishi ac with mr slim what you men by mr slim.and i noticed that it never cutt of set temp 23 for 3 hr use it not cutt off .it is not an inverter model normalaly ac are cut off 30 min of operation and restart afetr some time by archiving temprature it dinot cut off

149
Abhishek Jain (Mod)

MR Slim is a VRF (Variable refrigerant flow) Hot and Cold AC technology. It is explained well on this video: ...... it is very similar to inverter technology and it will not cut off the compressor (like in inverter tech).

150

"The options do not change the temperature of the room, nor do they change the electricity consumption".
Are you serious? So more cool air wont change the temperature and a faster fan speed wont increase electricity consumption? Whatever lol

151

How does drop in room temperature affect air con energy consumption? Lets say room temperature drop 5 degrees after roof painted with thermal insulation paint , if all other factors remain the same how much air conditioning energy can be saved ?

152
Abhishek Jain (Mod)

If suppose your outside temperature is 45 and you keep your AC at 25 then your electricity consumption is proportional to (45-25) = 20 .... let's say 20x

If you put a thermal insulation that reduces the temperature by 5 degrees then AC will have to bring down the temperature from 40 to 25 .... so difference is 15 and so energy consumption is about 15x

so savings is of 5x .... in percentage it becomes (5/20)*100 = 25 ......

However, firstly when outside temperature is 45 .... your indoor temperature will not be 45 ..... it would be less ..... and then it's not everyday that you have a outside temperature of 45.

Suppose your room temperature without insulation typically remains at 35 (when outside temperature is 45) .... and so your electricity consumption is (35-25) = 10x

and you reduce by 5 degrees so it becomes 5x ..... then your saving increases to 50%.

So a lot depends on your outside temperature and existing thermal conductivity of the wall and also the temperature at which you keep the AC.

153

Respected sir,
I bought my new Hitachi AC but after a week the gas got leaked. So I filled new gas from a local AC repairer.
Can it cause any effect on energy consumption..???

154
Abhishek Jain (Mod)

If it is cooling properly, then it should not cause any impact on energy consumption.

155

Sir,
I have a doubt. Running the AC in 16 degree at different intervals for about 2 to 3 hours in a night will save electricity?? or running the whole night with 25 to 26 degrees is the better option??

156
Abhishek Jain (Mod)

Running the AC whole night with 25-26 will be more comfortable and energy saving.

157

Thanks for your clarification

158

Dear Concern
I have a question. If I turn off and on after 15-20 min. interval is it consume more electricity?

[email protected]

Newaz

159
Abhishek Jain (Mod)

You should not be doing that. It will consume more electricity.

160

Thanks Abishek Thanks a lot

161

Hey Sir,

i bought 1 ton Whirlpol AC 3 months before. am from Taminadu - madurai. during the installation they did mistake so the gas leaked. they filled the gas again, but i got very low cool. again filed the gas after using vacuum machine. now i can feel the cool. but not sure whether its working fine or not. so i checked the timing. pls go thru the below info and give your thought -either my AC is fine or not

my room size is 10X11, i started my AC @ 9:30 PM , the room temp was @ 31.5, i set 25 degree in AC. after 90 mins it reached the 25 degree. with in 3 mins, the AC started again, and i set the 24 degree. i waited another 90 mins, but it did not cut off.

i used a thermometer to check the grill temperature by another day. after 30 mins the grill temp was 10.5 degree, after 1 hour it reach 8.7 degree.

one more info, in the same house , my brother's room also having the same AC installed on same day. when i checked in the Grill temp of the AC, it can reach 10.5 with in 15 mins and in 45 mins it reach 7.4 degree.

pls check and suggest , either my AC is working fine, or i should raise the complain again.

162
Abhishek Jain (Mod)

Hi Karthikeyan,

A lot depends on the cooling capacity of the AC and also the heat load of your room. Two rooms will have very different heat loads and two ACs can have different cooling capacity. I would suggest you to read this article on our website to see how an AC works: http://www.bijlibachao.com/air-conditioners/air-conditioner-work-laymans-explanation.html

As long as you are feeling comfortable and electricity consumption is not high, the AC is serving its purpose. If it is either not comfortable or consuming high electricity, you need to get alarmed.

163

Dear Sir,

Thanks for the reply. i understand about the head load of room . but my brother room and my room are ideally same. only one different is direction. but i checked the Grill temp @ 9:30PM so i think, the sun effects does not affect it.

can you pls give your suggestion about the below. is the below difference normal or any issue there in my room AC ?

i used a thermometer to check the grill temperature after 30 mins the grill temp was 10.5 degree, after 1 hour it reach 8.7 degree. it never reach less than 8

my brother's room also having the same AC installed on same day. when i checked in the Grill temp of the AC, it can reach 10.5 with in 15 mins and in 45 mins it reach 7.4 degree.

164
Abhishek Jain (Mod)

Hi Karthik,

It is difficult to comment.

165
Eduardo Fracassi

Hi have you published the demonstration of the Percentage Savings formula? Where? We need the formula's rationale for an important presentation. We obviously quoted your work with the corresponding reference citation.

166
Abhishek Jain (Mod)

I think I already replied to your email earlier. I can send it again if you did not get it.

167

Is there a way to calculate the number of units consumed by an AC with every 1 degree difference between outside temperature and the AC setting of temperature? for example, what will be the energy units consumed when temperature setting is 28 deg C and Temperature outside is 30 degree C? further how will the energy units consumed change when temperature setting is 27 deg C and Temperature outside stays at 30 degree C? the formula proposed by you talks about the relation between the old and new setting of AC temperature. I would like to understand the effect of (Temperature outside - Temperature setting) on the energy consumed, as per your argument in the above post - "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."
Thanks in advance.

168
Abhishek Jain (Mod)

The formula above has lots of assumptions built in, just to give a rough estimate. Heat load calculation involves a lot of things like:

1) Climate Data of the city.
2) The thermal properties of building materials
3) The effects of air infiltration and ventilation
4) The effects of windows, walls, roofs and partitions on loads
5) Internal Loads: Humans, Appliances, etc.

So even in same city, two room can have different electricity consumption depending on type of material used for construction, location and direction of the building, appliances and in general stuffing of the room, etc etc.

169
Eduardo Fracassi

Abhishek thanks for answering. No, I did not receive your email in my [email protected] email. Please resend!!!!! Eduardo

170
Eduardo Fracassi

Thank you so much!!! I did receive it ok. Regards, Eduardo

171

OH NOW I KNOW I SET MY AIRCONDITION TO 25 IT POWER SAVING THAT GOOD. FOR ME ITS GOOD BEACOUSE I HAVE SMALL ROOM.

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