What is Tonnage in Air Conditioner?


Picking the right size air conditioner is not an easy task without having the right information. Energy consumption is the main parameter that must be taken into mind before making a purchase.

But there is one parameter that affects energy consumption most, and it is “Tonnage”. if you do not belong to refrigeration or cooling field You may not familiar with this word, but if you have a little bit knowledge about this then you are able to buy a perfect air conditioner for your home.

So, let’s get to know more about Tonnage in this article,

what is tonnage in ac

Keep in mind that, before buying an air conditioner you must find out how much BTU Units you will need? You have to calculate the proper BTUs needed for your room and for what the room will be used.

So that you can select the air conditioner having tonnage capacity perfect for your room.

This calculations and smartness will result in saving money in price and in electricity bills. So that your hard-earned money will not be wasted.

Now after reading all of this one question has must hit to your mind


What is Tonnage in AC?

how to calculate BTU

In this article we will discuss in detail about tonnage and all other parameters related to it.

An air conditioner provides cooling for home by removing heat from the air. This heat is measured in BTUs (British Thermal Unit)

A 1 Ton Air Conditioner has the ability to remove 12000 BTU of heat from the air in one hour of time. Basically, the ability of an air conditioner to remove heat from the room in one hour is known as the tonnage capacity of the air conditioner.

The term Ton is derived the days before mechanical cooling when ice was an essential part of the refrigeration system/ cooling system.


What is BTU?

BTU stands for British Thermal Unit. It is a unit used to measure the heat present in the air. BTU is directly proportional to the tonnage capacity of air conditioner that is, higher the BTU will lead to the higher tonnage air conditioner.

Remember that, 1 Ton = 12000 BTU.

Also, you should keep in mind that bigger the room, you will require air conditioner with higher tonnage capacity.

Now, you have the basic idea about Ton and BTU but one question will still bother you and that question is


How to calculate the BTU of your room?

what is BTU

So that you can select the air conditioner with suitable tonnage capacity

For precise readings, you’ll probably need to hire a qualified heating engineer to calculate the BTU output for you. However, for an estimated reading, there are plenty of tools online that can provide a guide. However, calculating BTU is not an impossible task, and you can even do it all by yourself.

If you are calculating by yourself you need to:

1. Measure the square footage of the room,

(Length * Width)

2. If the room is on the main floor then do,

(Square footage * 30)

3. If the room is on second floor or kitchen area then do,

(Square footage * 40)

4. Then, if ceiling height is over 8 feet then add 1000 BTU for every foot after that 8 feet.

5. No. of people living in the room should also be taken into consideration, for each person after the first two individuals you should add an additional 600 BTU in it.



Let’s take an example,

1. (15 * 15 = 125 sq. ft.)

2. If the room is on second floor then, (125 * 40 = 5000)

3. Ceiling height is 9 feet then, (5000 + 1000 = 6000)

4. There are 3 members then, (6000 + 600 = 6600)

Hence, room with 125 sq. ft. has 6600 BTU which means 0.75 Ton to 1 Ton air conditioner is suitable for that room.

Please note that this is the estimated value of BTU of the room so that you can get an idea about which air conditioner suitable for your room.

For perfect value you should hire the professionals.


How to select the perfect tonnage air conditioner for the room?


As of now, we have seen, how to calculate BTU output of a room, although this will be estimated value still you will get an idea about which will be a perfect air conditioner for a room.

1 Ton = 12000 BTU, then if the room has 18000 BTU output then 1.5 Ton air conditioner is perfect for that room.

Hope you will get an idea about how to choose a perfect air conditioner for your room and what is tonnage in air conditioners?

Thank You.


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