Heat pump vs gas boiler
Estimate annual space-heating demand from floor area and insulation class, then compare heat-pump electricity cost (by SCOP) against a gas boiler.
Open calculatorAir-conditioning cooling load
Cooling power (watts) = floor area (m²) × specific heat load (W/m²). Converted to BTU/h (1 W ≈ 3.412 BTU/h) to match standard split AC unit ratings (e.g. 9,000 BTU/h ≈ 2.6 kW; 12,000 BTU/h ≈ 3.5 kW).
Floor footprint of the room to cool in square metres.
m²
Use 80–100 W/m² for a standard shaded room, or 120–150 W/m² for an attic room or large south/west-facing windows.
W/m²
Required cooling capacity
4,800 W
Equivalent in BTU/h
16,378 BTU/h
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A typical 25 m² bedroom or office usually pairs with a 2.5–2.6 kW (9,000 BTU/h) split air conditioner.
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Educational estimate only. Not medical, tax, legal or financial advice.