Heat Pump Sizing for 540 m² (5,813 sq ft) — Australia & Mild APAC (Sydney/Melbourne/Tokyo)
Thermal heat loss calculation, recommended heat pump capacity (kW, BTU/h & HVAC Tons), SCOP efficiency, and annual electricity consumption.
Recommended Heat Pump37.3 kW127,273 BTU/h (10.61 Tons)
Annual Electricity Usage11,424 kWh/yrDelivers 51,408 kWh Heat (SCOP 4.5)
Savings vs Direct Electric39,984 kWh/yrSpecific Load: 68.0 W/m²
Electrical Circuit (230V)60 A BreakerPeak Compressor Input: 10.08 kW
Thermal & Electrical Specification Table (540 m² / 5,813 sq ft)
| Heated Floor Area | 540 m² (5,813 sq ft) |
| Climate Zone & Design Outdoor Temp | Australia & Mild APAC (Sydney/Melbourne/Tokyo) |
| Building Insulation Envelope | Older Uninsulated Building (85 W/m² Base) (68.0 W/m² Peak) |
| Peak Space Heating Load | 36.72 kW Thermal |
| Recommended Heat Pump Output (Incl. DHW) | 37.3 kW (127,273 BTU/h · 10.61 Tons) |
| Seasonal Coefficient of Performance (SCOP) | 4.5 (340%–450% Seasonal Efficiency) |
| Annual Heat Demand vs Electricity Consumed | 51,408 kWh Heat → 11,424 kWh Electricity |
Frequently Asked Questions
What kW size heat pump do I need for a 540 m² (5813 sq ft) house?
For a 540 m² (5813 sq ft) building with Older Uninsulated Building (85 W/m² Base) in Australia & Mild APAC (Sydney/Melbourne/Tokyo), the peak space heating load is 36.72 kW (68.0 W/m²). Including domestic hot water allowance, a 37.3 kW (127,273 BTU/h / 10.61 Ton) heat pump is recommended.
How many kWh of electricity does a 37.3 kW heat pump use per year?
With a Seasonal Coefficient of Performance (SCOP) of 4.5 over 1400 full-load equivalent heating hours, the heat pump consumes approximately 11,424 kWh of electricity per year to deliver 51,408 kWh of heat — saving 39,984 kWh/year compared to direct electric radiators.
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