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When purchasing an air conditioner, selecting the appropriate capacity is a top priority. If the capacity is too small, it will operate continuously, leading to quick damage. If it's too large, it will waste electricity and incur higher costs. So, how to accurately calculate the air conditioner capacity? Let's find out through the article below with Mytour.vn!
1. Calculate Air Conditioner Capacity Based on m2
Air conditioner capacity is typically measured in BTU (British thermal units). Power consumption is measured in HP (horsepower), where 1 HP = 750W. Therefore, 1 HP is equivalent to 9,000 BTU/h. In other words, an air conditioner with a power of 1 HP is equivalent to a cooling capacity of 9,000 BTU.
Calculating air conditioner capacity based on m2 is often applied to rooms with ceilings at an average height of 3m or lower (commonly seen in Vietnam). To calculate the air conditioner capacity, measure the room's area: Area = Length x Width. The suitable air conditioner capacity for room areas is then calculated with the formula:
Optimal Capacity = Room Area x 600 BTU
Example: If your room has an area of 30m2, you will calculate the suitable capacity as: 30m2 x 600 BTU = 18000 BTU, equivalent to an air conditioner with a 2 HP capacity.
Reference Table for Air Conditioner Capacity Based on m2:
| Công suất máy lạnh | Diện tích phòng |
| 1 HP ~ 9000 BTU | Dưới 15 m2 |
| 1.5 HP ~ 12.000 BTU | Từ 15 đến 20 m2 |
| 2 HP ~ 18.000 BTU | Từ 20 đến 30 m2 |
| 2.5 HP ~ 24.0000 BTU | Từ 30 đến 40 m2 |
2. Calculate Air Conditioner Capacity Based on m3
The method of calculating air conditioner capacity based on volume (m3) is more accurate than calculating based on area and should be applied to rooms with high ceilings. If you apply this method, measure the height, width, and length of the room, then calculate the room's volume: Volume = Length x Width x Height. After that, calculate the suitable capacity using the formula for air conditioner capacity:
Optimal Capacity = Room Volume x 200 BTU
Example: If your room has a volume of 50m3, the suitable air conditioner capacity is: 50m3 x 200 BTU = 12000 BTU. With this capacity, you should choose an air conditioner with a 1.5 HP capacity for more effective cooling.
Reference Table for Air Conditioner Capacity Based on m3:
| Công suất máy lạnh | Thể tích phòng |
| 1 HP ~ 9000 BTU | Dưới 45 m3 |
| 1.5 HP ~ 12.000 BTU | Dưới 60 m3 |
| 2 HP ~ 18.000 BTU | Dưới 80 m3 |
| 2.5 HP ~ 24.0000 BTU | Dưới 120 m3 |
3. Quickly check air conditioner capacity through a comparison table
When choosing air conditioner capacity, you need to observe external factors as well. For example, room space, frequent opening and closing of doors, the number of people in the room, etc. For air conditioners in family rooms, the capacity is usually smaller, while in cafes and restaurants, due to frequent door opening, a larger capacity is needed. Below is a reference table of air conditioner capacity for rooms with a height ranging from about 2.5m to 3m:
| Công suất | Gia đình | Quán cà phê/Nhà hàng | Khách sạn | Văn phòng |
| 1 HP ~ 9000 BTU | 45 m3 | 30 m3 | 35 m3 | 45 m3 |
| 1.5 HP ~ 12.000 BTU | 60 m3 | 45 m3 | 55 m3 | 60 m3 |
| 2 HP ~ 18.000 BTU | 80 m3 | 60 m3 | 70 m3 | 80 m3 |
| 2.5 HP ~ 24.0000 BTU | 120 m3 | 80 m3 | 100 m3 | 120 m3 |
| 3 HP ~ 30.0000 BTU | 150m3 | 100m3 | 120m3 | 150m3 |
| 3.5 HP ~ 36.0000 BTU | 170m3 | 120m3 | 150m3 | 170m3 |
| Lưu ý: nếu kích thước trần lớn hoặc nhỏ hơn tham khảo cách tính theo m2 và m3 ở trên |
Here is all the information on how to calculate the suitable air conditioner capacity. If your room is too large, instead of installing one large-capacity air conditioner, you can also consider installing multi-split air conditioners or floor-standing air conditioners. Wish you find the air conditioner product that suits your needs soon!
