Heat Pump Sizing for 106 m² (1,141 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 Pump3.6 kW12,284 BTU/h (1.02 Tons)
Annual Electricity Usage924 kWh/yrDelivers 4,158 kWh Heat (SCOP 4.5)
Savings vs Direct Electric3,234 kWh/yrSpecific Load: 28.0 W/m²
Electrical Circuit (230V)6 A BreakerPeak Compressor Input: 0.97 kW
Thermal & Electrical Specification Table (106 m² / 1,141 sq ft)
| Heated Floor Area | 106 m² (1,141 sq ft) |
| Climate Zone & Design Outdoor Temp | Australia & Mild APAC (Sydney/Melbourne/Tokyo) |
| Building Insulation Envelope | Modern / New Build Insulation (35 W/m² Base) (28.0 W/m² Peak) |
| Peak Space Heating Load | 2.97 kW Thermal |
| Recommended Heat Pump Output (Incl. DHW) | 3.6 kW (12,284 BTU/h · 1.02 Tons) |
| Seasonal Coefficient of Performance (SCOP) | 4.5 (340%–450% Seasonal Efficiency) |
| Annual Heat Demand vs Electricity Consumed | 4,158 kWh Heat → 924 kWh Electricity |
Frequently Asked Questions
What kW size heat pump do I need for a 106 m² (1141 sq ft) house?
For a 106 m² (1141 sq ft) building with Modern / New Build Insulation (35 W/m² Base) in Australia & Mild APAC (Sydney/Melbourne/Tokyo), the peak space heating load is 2.97 kW (28.0 W/m²). Including domestic hot water allowance, a 3.6 kW (12,284 BTU/h / 1.02 Ton) heat pump is recommended.
How many kWh of electricity does a 3.6 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 924 kWh of electricity per year to deliver 4,158 kWh of heat — saving 3,234 kWh/year compared to direct electric radiators.
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