Heat Pump Sizing for 132 m² (1,421 sq ft) — UK & Temperate Maritime (-5°C Design, UK/IE/NZ)
Thermal heat loss calculation, recommended heat pump capacity (kW, BTU/h & HVAC Tons), SCOP efficiency, and annual electricity consumption.
Recommended Heat Pump7.5 kW25,591 BTU/h (2.13 Tons)
Annual Electricity Usage3,025 kWh/yrDelivers 12,402 kWh Heat (SCOP 4.1)
Savings vs Direct Electric9,377 kWh/yrSpecific Load: 52.2 W/m²
Electrical Circuit (230V)13 A BreakerPeak Compressor Input: 2.27 kW
Thermal & Electrical Specification Table (132 m² / 1,421 sq ft)
| Heated Floor Area | 132 m² (1,421 sq ft) |
| Climate Zone & Design Outdoor Temp | UK & Temperate Maritime (-5°C Design, UK/IE/NZ) |
| Building Insulation Envelope | Standard Double-Glazed Insulation (55 W/m² Base) (52.2 W/m² Peak) |
| Peak Space Heating Load | 6.89 kW Thermal |
| Recommended Heat Pump Output (Incl. DHW) | 7.5 kW (25,591 BTU/h · 2.13 Tons) |
| Seasonal Coefficient of Performance (SCOP) | 4.1 (340%–450% Seasonal Efficiency) |
| Annual Heat Demand vs Electricity Consumed | 12,402 kWh Heat → 3,025 kWh Electricity |
Frequently Asked Questions
What kW size heat pump do I need for a 132 m² (1421 sq ft) house?
For a 132 m² (1421 sq ft) building with Standard Double-Glazed Insulation (55 W/m² Base) in UK & Temperate Maritime (-5°C Design, UK/IE/NZ), the peak space heating load is 6.89 kW (52.2 W/m²). Including domestic hot water allowance, a 7.5 kW (25,591 BTU/h / 2.13 Ton) heat pump is recommended.
How many kWh of electricity does a 7.5 kW heat pump use per year?
With a Seasonal Coefficient of Performance (SCOP) of 4.1 over 1800 full-load equivalent heating hours, the heat pump consumes approximately 3,025 kWh of electricity per year to deliver 12,402 kWh of heat — saving 9,377 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 Pump132 m² in Nordic / Scandinavia132 m² in Central Europe / DACH132 m² in US North & Canada Cold132 m² in US Sunbelt & Mediterranean132 m² in Australia & Mild APAC