Heat Pump Sizing for 72 m² (775 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 Pump3.8 kW12,966 BTU/h (1.08 Tons)
Annual Electricity Usage986 kWh/yrDelivers 4,438 kWh Heat (SCOP 4.5)
Savings vs Direct Electric3,452 kWh/yrSpecific Load: 44.0 W/m²
Electrical Circuit (230V)6 A BreakerPeak Compressor Input: 1.03 kW
Thermal & Electrical Specification Table (72 m² / 775 sq ft)
| Heated Floor Area | 72 m² (775 sq ft) |
| Climate Zone & Design Outdoor Temp | Australia & Mild APAC (Sydney/Melbourne/Tokyo) |
| Building Insulation Envelope | Standard Double-Glazed Insulation (55 W/m² Base) (44.0 W/m² Peak) |
| Peak Space Heating Load | 3.17 kW Thermal |
| Recommended Heat Pump Output (Incl. DHW) | 3.8 kW (12,966 BTU/h · 1.08 Tons) |
| Seasonal Coefficient of Performance (SCOP) | 4.5 (340%–450% Seasonal Efficiency) |
| Annual Heat Demand vs Electricity Consumed | 4,438 kWh Heat → 986 kWh Electricity |
Frequently Asked Questions
What kW size heat pump do I need for a 72 m² (775 sq ft) house?
For a 72 m² (775 sq ft) building with Standard Double-Glazed Insulation (55 W/m² Base) in Australia & Mild APAC (Sydney/Melbourne/Tokyo), the peak space heating load is 3.17 kW (44.0 W/m²). Including domestic hot water allowance, a 3.8 kW (12,966 BTU/h / 1.08 Ton) heat pump is recommended.
How many kWh of electricity does a 3.8 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 986 kWh of electricity per year to deliver 4,438 kWh of heat — saving 3,452 kWh/year compared to direct electric radiators.
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