Heat Pump Sizing for 148 m² (1,593 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 Pump7.1 kW24,226 BTU/h (2.02 Tons)
Annual Electricity Usage2,025 kWh/yrDelivers 9,114 kWh Heat (SCOP 4.5)
Savings vs Direct Electric7,089 kWh/yrSpecific Load: 44.0 W/m²
Electrical Circuit (230V)13 A BreakerPeak Compressor Input: 1.92 kW
Thermal & Electrical Specification Table (148 m² / 1,593 sq ft)
| Heated Floor Area | 148 m² (1,593 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 | 6.51 kW Thermal |
| Recommended Heat Pump Output (Incl. DHW) | 7.1 kW (24,226 BTU/h · 2.02 Tons) |
| Seasonal Coefficient of Performance (SCOP) | 4.5 (340%–450% Seasonal Efficiency) |
| Annual Heat Demand vs Electricity Consumed | 9,114 kWh Heat → 2,025 kWh Electricity |
Frequently Asked Questions
What kW size heat pump do I need for a 148 m² (1593 sq ft) house?
For a 148 m² (1593 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 6.51 kW (44.0 W/m²). Including domestic hot water allowance, a 7.1 kW (24,226 BTU/h / 2.02 Ton) heat pump is recommended.
How many kWh of electricity does a 7.1 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 2,025 kWh of electricity per year to deliver 9,114 kWh of heat — saving 7,089 kWh/year compared to direct electric radiators.
Compare Other Home Sizes & Climate Zones
60 m² (646 ft²) Heat Pump80 m² (861 ft²) Heat Pump100 m² (1076 ft²) Heat Pump120 m² (1292 ft²) Heat Pump140 m² (1507 ft²) Heat Pump160 m² (1722 ft²) Heat Pump180 m² (1938 ft²) Heat Pump200 m² (2153 ft²) Heat Pump250 m² (2691 ft²) Heat Pump300 m² (3229 ft²) Heat Pump148 m² in Nordic / Scandinavia148 m² in Central Europe / DACH148 m² in UK & Temperate Maritime148 m² in US North & Canada Cold148 m² in US Sunbelt & Mediterranean