Aircon BTU Calculator for Singapore Homes
Calculated load ≈ 3,800 BTU/h
Calculated load ≈ 2,700 BTU/h
Calculated load ≈ 9,500 BTU/h
Total fan-coil capacity
30,000 BTU
3 fan coils, a System 3 setup if on one compressor.
How this works
We use the room-size rule of thumb common among Singapore aircon retailers: about 25 BTU per square foot of floor area, plus 10% for west- or sun-facing rooms, 600 BTU for each regular occupant beyond two, and extra for kitchens or rooms with heat-generating equipment.
Capacities are rounded up to the next standard fan-coil size (9,000 / 12,000 / 18,000 / 24,000 BTU). Ceiling height, insulation and window area matter, so ask an installer to confirm.
FAQs
What BTU aircon do I need for an HDB bedroom?
A typical HDB common bedroom of 9–11 m² (100–120 sq ft) needs about 9,000 BTU; a master bedroom of 12–16 m² usually needs 12,000 BTU. West-facing rooms or rooms with more people may need the next size up.
Is a bigger aircon always better?
No. An oversized unit cools quickly then cycles off before removing humidity, leaving the room clammy and wasting energy. Match capacity to the room, and choose an inverter system with a good energy label.