AirconTalk Blog
AirConTalk E-Store
History Of Air-Con
How AirCon Work
Types of Air-Con
Aircon Water Leak
Air-Con Insulation
Gas Leak
Air-Con DIY
Calculate BTU
R22 vs R410a
Air-Con Servicing
Air-Con Saving Tips
Air-Con News
About Vincent :)

Subscribe To This Site
Add to Google
Add to My Yahoo!
Add to My MSN
Subscribe with Bloglines

Calculate Btu - Air Conditioner

Air-Conditioning Btu Calculations

Do you know how to calculate the right size of air-conditioner Btu capacity for your room? Most people rely on his own air-con contractor in getting the right air-conditioner BTU capacitor for them. But you are the one using the air-conditioning so you should know yourself best.

Are you the one who like to blast your air-conditioner to the coolest? Or are you the person who feel that turning on 25-26 Degree Celsius is adequate for you?
It is important for you to know how to calculate the air-conditioner BTU because if done incorrectly, you might end up buying an under-size or oversize air-conditioner BTU.

An undersized air-conditioner BTU will not be adequate to cool your room, or it may take a long time to cool it especially the weather now is very hot.

It is also not cost effective getting an over-sized air-conditioner BTU. Due to the over-sized air-conditioner BTU capacity, the air-conditioner cool the room too fast which causes the compressor to cut-in (Start) and cut-out (Stop) too often.

Each time the compressor cut-in to run, the power consumption is about 6 times higher than its running current. With this cycle on and off too often it decreases the efficiency and increase your electrical bill.

It will also cause your compressor to have a shorter lifespan too. Replacing a new compressor can cost as much as SGD$900 and above depend on the size of your compressor.

So now do you think knowing how to calculate BTU for your air-conditioners and getting the right Btu air-conditioner for your room is important?

Cooling Capacity

The cooling capacity of an air-conditioning unit is the ability to remove heat from a room and in usually measured in Btu/hr. The higher the Btu rating, the more heat will be removed. It is important that the room air-conditioner BTU is large enough for the room to be cooled.

Air-Conditioner BTU Calculation

How do you calculate btu your air-conditioner for your room? Please note that the method of calculate btu mention below is just an estimation to determine the amount of air-conditioner btu need to cool your room. Giving a consideration of 1-2 people is staying in the room.

Step 1:

Calculate the volume of the room - Length x Breadth x Height = Ans / 2 (answer divided by 2)

For example - 2.5m x 3m x 2.5m = 18.75 / 2 = 9.375

Step 2:

With the given answer (9.375). Match with the closest BTU capacity air-conditioner below with your answer which is between 9,000Btu and 12,000Btu.

List of air-conditioner BTU rating:


And so on...

Therefore you should get a 9,000Btu air-conditioner if you are afraid of cold and get a 12,000Btu air-conditioner if you are a person who are afraid of hot by getting a slightly bigger air-conditioning BTU.

What if you had already installed an under-size air-conditioner?

Here are some methods you may want to adopt:

1) Using curtain to partition your working area.

2) Adding a fan.

3) Adding another air-conditioner.

footer for calculate btu page