Recommended size: about 6,800 BTU/h (2 kW); the nearest standard unit is 7,000 BTU. Running it 8 h a day costs 0.37 € per day.
Cooling cost per season
€27.75
111 kWh over 75 days
Cost per hour
€0.046
0.18 kW average draw
Cost per day
€0.37
Cost per month of use
€11.10
Recommended size
6,800BTU/h
2 kW cooling · 0.57 tons
Unit used for costs
7,000BTU/h
2.05 kW · max input 0.34 kW
Efficiency (W/W)
6.1
= 20.8 BTU/Wh
CO₂ per year
39kg
Quick sizing guide (average room, warm climate)
| Room area | BTU/h | kW cooling |
|---|---|---|
| 10 m² (108 ft²) | 2,700 | 0.8 |
| 15 m² (161 ft²) | 4,100 | 1.2 |
| 20 m² (215 ft²) | 5,500 | 1.6 |
| 25 m² (269 ft²) | 6,800 | 2 |
| 30 m² (323 ft²) | 8,200 | 2.4 |
| 40 m² (430 ft²) | 10,900 | 3.2 |
| 50 m² (538 ft²) | 13,600 | 4 |
| 70 m² (753 ft²) | 19,100 | 5.6 |
- Sizing ≈ 80 W/m² (25 BTU/h per ft²) adjusted for ceiling height, climate, sun, occupants (+600 BTU/h each beyond two) and kitchens (+4,000 BTU/h), in line with ENERGY STAR guidance. Poorly insulated rooms may need 20–30% more.
- Running cost = capacity ÷ efficiency × load factor × hours. SEER already reflects part-load operation; for EER (full-load) ratings a load factor of ~70% is more realistic.