Heat Pump Sizing for 612 m² (6,588 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 Pump42.2 kW143,992 BTU/h (12.0 Tons)
Annual Electricity Usage12,948 kWh/yrDelivers 58,268 kWh Heat (SCOP 4.5)
Savings vs Direct Electric45,320 kWh/yrSpecific Load: 68.0 W/m²
Electrical Circuit (230V)63 A BreakerPeak Compressor Input: 11.41 kW
Thermal & Electrical Specification Table (612 m² / 6,588 sq ft)
| Heated Floor Area | 612 m² (6,588 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 | 41.62 kW Thermal |
| Recommended Heat Pump Output (Incl. DHW) | 42.2 kW (143,992 BTU/h · 12.0 Tons) |
| Seasonal Coefficient of Performance (SCOP) | 4.5 (340%–450% Seasonal Efficiency) |
| Annual Heat Demand vs Electricity Consumed | 58,268 kWh Heat → 12,948 kWh Electricity |
Frequently Asked Questions
What kW size heat pump do I need for a 612 m² (6588 sq ft) house?
For a 612 m² (6588 sq ft) building with Older Uninsulated Building (85 W/m² Base) in Australia & Mild APAC (Sydney/Melbourne/Tokyo), the peak space heating load is 41.62 kW (68.0 W/m²). Including domestic hot water allowance, a 42.2 kW (143,992 BTU/h / 12.0 Ton) heat pump is recommended.
How many kWh of electricity does a 42.2 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 12,948 kWh of electricity per year to deliver 58,268 kWh of heat — saving 45,320 kWh/year compared to direct electric radiators.
Compare Other Home Sizes & Climate Zones
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