Calculate how many BTU/h, kW and frigories you need to cool a room based on area, ceiling height, solar orientation and insulation.
HVAC Standard (ASHRAE & EN 14511): 1,000 BTU/h equals 0.293 kW of thermal cooling capacity (1 Ton of refrigeration = 12,000 BTU/h = 3.517 kW).
| Room Floor Area | Frigories / hour | Cooling Power (kW) | BTU/h Capacity | Commercial Model Size |
|---|---|---|---|---|
| 12 m² to 18 m² | 2.000 - 2.250 fg/h | 2,3 - 2,6 kW | 9.000 BTU/h | Bedroom Split / 2.5 kW Class |
| 20 m² to 28 m² | 3.000 fg/h | 3,5 kW | 12.000 BTU/h | Standard Room Split / 3.5 kW Class |
| 30 m² to 40 m² | 4.300 - 4.500 fg/h | 5,0 - 5,2 kW | 18.000 BTU/h | Large Living Room Split / 5.0 kW Class |
| 45 m² to 60 m² | 6.000 fg/h | 7,0 kW | 24.000 BTU/h | Commercial / Ducted Unit 7.0 kW Class |
7143 BTU/h (Split / HVAC)
8631 BTU/h (Split / HVAC)
10119 BTU/h (Split / HVAC)
11111 BTU/h (Split / HVAC)
13591 BTU/h (Split / HVAC)
16072 BTU/h (Split / HVAC)
18552 BTU/h (Split / HVAC)
21032 BTU/h (Split / HVAC)
25992 BTU/h (Split / HVAC)
30953 BTU/h (Split / HVAC)
40873 BTU/h (Split / HVAC)
50794 BTU/h (Split / HVAC)
A standard room with 2.5m ceilings requires roughly 400 to 500 BTU/h per m² (0.12 to 0.15 kW per m²), plus 600 BTU/h per additional occupant.
1,000 frigories/h equals 1.163 kW of thermal cooling capacity or 3,968.3 BTU/h (3,000 frigories ≈ 12,000 BTU/h = 3.5 kW).