Choosing the right air conditioner for your home isn’t just a matter of price—the right capacity is essential for ensuring comfort and energy efficiency. In this article, we explain everything about BTUs and how to choose the ideal capacity for each room.
What is a BTU?
BTU (British Thermal Unit) is the unit of measurement for an air conditioner’s cooling (or heating) capacity. The more BTUs the unit has, the greater its cooling capacity. Choosing the right capacity is essential: an undersized unit works constantly, while an oversized one creates unstable temperatures and wastes energy.
Factors that influence the choice
- Room area (m²): the most decisive factor—larger spaces require more power
- Ceiling height: higher ceilings increase the volume to be cooled
- Sun exposure: rooms with high sun exposure require higher capacity
- Number of occupants and appliances: additional heat sources that increase the thermal load
- Thermal insulation: well-insulated homes require less power
Reference table of BTUs per area
- 7,000 BTUs: up to 10 m²
- 9,000 BTUs: 10–15 m²
- 12,000 BTUs: 15–20 m²
- 18,000 BTUs: 20–30 m²
- 24,000 BTUs: 30–40 m²
Practical example
Consider an apartment with a 12 m² bedroom and a 24 m² living room facing west. The bedroom requires 9,000 BTUs. The living room, given the additional heat in the afternoon, requires 18,000 BTUs. An analysis that seems simple, but can make a difference on your monthly bill.
The consequences of the wrong choice
Insufficient capacity: the unit runs constantly without reaching the desired temperature, wears out faster, and increases energy consumption. Excessive capacity: represents an unnecessary investment and can cause rapid temperature fluctuations that reduce comfort.
To ensure you make the right choice for your specific situation, consult the experts at LEFE. We conduct a personalized analysis and recommend the most suitable solution free of charge and with no obligation.
