Does the aircon temperature affect electricity consumption? How much electricity do I save by setting the home air conditioner temperature one degree Celsius higher? Let say from 23 degree to 24 degree. How many percent can save from electricity bill for each degree higher? 3 to 5 % cut?

Heard that running at 24 degrees, the compressor will work for much less time, leading to less power consumption. Once the desired temperature is reached, the compressor stops functioning, and only the AC fan works. The compressor restarts once the thermostat detects increase in temperature. Is that true? Is there any facts or data research on this?

This post has been edited by goolie: Sep 20 2023, 10:18 AM

ChatGPT:
The exact amount of electricity you save by increasing the thermostat temperature by one degree Celsius depends on various factors, including the efficiency of your air conditioner, the size of your home, the outdoor temperature, and the insulation in your home. However, as a rough estimate, it's commonly suggested that each degree Celsius increase in your thermostat setting can lead to energy savings of around 3-5%.

Depends on room size/heat load/west or non-west facing walls.
I usually have INV running at 26-28C. Sleep without blanket/use thin blanket.

If you set to igloo temperature of course $$ needed to cool down. Typically 25C and above setting is optimum point.

Depends on your aircon horsepower to roomsize ratio.
Also if your room ceiling and windows got sunlight causing more heat.

I use aircon on 26 Celsius combine with the room fan operating on low speed.
Yes there are certainly some savings if you used to blast the aircon with low temp settings.

Most important is there are some windy feelings in the room I am satisfied.

• Improve heat insulation especially on the roof and window.
• Use inverter aircon.
• Use aircon with correct capacity.

I dont know about others but I have a non inverter 1 hp unit (Daikin) in my master room that I use daily

My usage is - turn on approx 2.30am every night, set timer for it to off at 7am daily. Temperature was set to 23c, full fan speed. Around 3am or 3.30am usually when I go to bed, I will turn on Sleep mode and reduce the fan speed to minimum. My ceiling fan is connected to smart switch so I just set timer for it to turn on at 7am

Based on TnB app, my daily electric usage is around 8 - 10kw everyday, this is including a inverter side by side fridge

This post has been edited by ZeneticX: Sep 21 2023, 01:28 PM

Air cond is to give comfort according to own set temperature.

If one were to set temperature to reduce energy and suffers discomfort, I suggest use the ceiling fan.

Are you even using an inverter? If not then there is no point discussing this.

A non inverter is basically on and off state. Hence it cuts off power to the compressor when your room reached the set temperature. It will restart the compressor when it went above your set temperature. An inverter works differently. Even before it reached the set temperature, the compressor already start to reduce power consumption when the room gets close to the set temperature and the compressor never turn off. It basically just run at a very low power mode when it reached your set temperature and increase it slightly when it goes above it later. So instead of being 0% (off) or 100% (on), it could be running at 20% when it reached set temperature, and then ramp up to 40% or 60% when the temp increase.

It is very hard to prove exactly how much you will save since everyday is different and not a controlled environment like a lab. On a hot day, the ac would have to work harder to lower the room temperature which would lead to higher energy usage. For example, past few days has been quite chilly. I have set the ac (Samsung Windfree Premium 1hp) in my son's room (10x12ft) to turn on at 840pm and turn off at 500am. Temp set is 25C. Power usage tracking in smarthings app record daily usage around 1.2~1.3kWh. Normally it would not be so low. On a normal day with real good sunlight, it normally record around 1.7~2.2kWh daily.

One thing that I cant say for sure is whether using inverter will help you save since most ac were tested in a controlled lab environment to cool until 25C. Yours is set to 23C and it would take longer time to reach said temperature and keep it there especially on a hot day. Inverter or non inverter would end up using the same amount of power if it never reach or get close to the set temp. Just like my mom who kept complaining high electricity bill. She dont understand why she needs to change to 24/25c from her 20c. Basically her inverter ac just run at full power consuming almost 1kWh per hour. Basically identical power usage compared to a non inverter.

To give you an example of how much 1C would use, I used to set my son ac at 26C and the daily power usage is around 1.2~1.7kWh. Another point to remember is that ac performance deteriorate as you run it due to dust and clogged blower. I just cleaned my son ac blower with compressed air and brush a week ago since the power usage double despite the same setting.

No, it is very different. AC at higher temp does give comfort since it reduce humidity in the space that it is cooling. Ceiling fan when it is right below the roof sucks because it just blew whatever hot air trapped in the ceiling. Ceiling fan works for condo and double storey (or higher) because the concrete ceiling do not trap hot air and the hot air will find its way onto upper floors.

For my ac (1HP, Masterbed room) I tend to use 25C or 26C at fan speed 1. The pic below is 26C at fan speed 1.

Compressor ON:
Observed range from 600-800+ watts

Compressor OFF
7W




All my rooms have no fan installed. Hence the need to control AC usage. I set all either to 25 if too hot, or 26 if colder weather like now. Total monthly usage shown in pic also.

This post has been edited by bismaximus: Sep 23 2023, 10:03 AM

I like my temp at 23. I cannot have a good sleep if is others. Only in extreme prolong hot weather, I will reduce 1 degree.

BTW, ceiling fan is just an example in the reply. Stand fan is also an option depending on own preference.

All sort of fans also useless when the rooms are right below the roof. The humidity leaks from the roof. You can have stand fan but the wind will still hit the wall and circulate up, mixed with the hot and humid air right below the ceiling, goes through the fan again. Thats why stand fan are better used as exhaust to blew hot and humid air out through the window.

Thanks for sharing your experience. I found it very useful. Btw, how can I use smart app to check power usage of aircon? Do i need to install anything in my house?

You need to buy ac with wifi features in order to use power usage monitoring.

what app is this?

Not really, if you got smart home system, it can be done easily with power monitoring device

Such as sonoff power monitoring

https://sonoff.tech/product/diy-smart-switches/pow-origin/

I just find it inconvenient compared to a wifi equipped ac but it does work.

Blow air from outside->inside->suck back outside is better.

set to 26 27 is the best as it remove water from the air, making you feel comfortable (dehumidifying)

consumption is less than half of non inverter