Choosing the right air conditioner capacity to match the house area, room volume is a challenge that not every consumer can grasp, especially first-time buyers. In this article, Mytour Supermarket will share with you how to calculate the air conditioner capacity to suit the room area.
Before delving into the main issue, let's understand the basic area calculation in square or rectangular spaces. Before preparing to install the air conditioner, we should also measure the height from the floor to the ceiling.
- Area S = Length 4m x Width 3m = 12 m2
- Volume V = Area 12m2 x Height 3m = 36m3
Calculating the capacity of the air conditioner
1 HP (electrical power, compressor power) = 750 W (electrical power) = 9000 BTU/h (cooling power). Cooling power = W.
We often hear most about Cooling Power BTU/h, the section below will guide you on how to calculate the cooling capacity required for the room in this unit Btu/h.
We can apply the formula: 1 m2 x 600 BTU. Where BTU is the British thermal unit, used to measure the power of heating or cooling devices.
For example, for a room with an area of 15m2, you will calculate: 15 m2 x 600 BTU = 9,000 BTU equivalent to an air conditioner with a capacity of 1 HP (1 HP = 1 horsepower equivalent to 9,000 BTU).
Details as follows:
- The room has dimensions: 3 x 4 x 3m = 36 m3. Choose a 1 HP air conditioner
- The room has dimensions: 4 x 5 x 3m = 60 m3. Choose a 1.5 HP air conditioner
- The room has dimensions: 4 x 6 x 3.5m = 84 m3. Choose a 2 HP air conditioner
- Rooms from 30 m2 to 40 m2 (under 120 m3). Choose a 2.5 HP air conditioner
Considerations when choosing air conditioners with excess or insufficient capacity

Considerations when choosing air conditioners with excess or insufficient capacity
When purchasing an air conditioner, it is advisable to choose a slightly higher capacity. It may cost a little more initially, but in the long run, it proves to be more effective than an air conditioner with just the right capacity. An air conditioner with this excess capacity operates quite powerfully, cools quickly, allowing for more downtime, thus extending its durability and consuming less electricity. It runs for a short period as the room reaches the desired temperature and automatically shuts off, whereas units with just enough or insufficient capacity have to run continuously to maintain the room's coolness.
Choosing an air conditioner for household use

Choosing an air conditioner for household use
Air conditioners for households typically have smaller capacities because they do not need to cool excessively. However, for living rooms and kitchens, you should add 0.5Hp
- Volume approximately 40 m3 (cubic) = 1.0 Hp
- Volume approximately 60 m3 (cubic) = 1.5 Hp
- Volume approximately 80 m3 (cubic) = 2.0 Hp
Installing air conditioners for living rooms, offices, restaurants

Installing air conditioners for living rooms, offices, restaurants...
Installing air conditioners for rooms The loss of cold air is relatively large, as there are many heat-generating devices such as: TVs, computers, fax machines... and people come in and out frequently, so at this time we will divide the volume by 35…
- Volume approximately 35 m3 (cubic) = 1.0 Hp
- Volume approximately 55 m3 (cubic) = 1.5 Hp
- Volume approximately 70 m3 (cubic) = 2.0 Hp
We hope that with the above article from Mytour, it will help you understand clearly about the concept of air conditioner capacity for suitable installation according to the area of use for your family.