Heat Pump Sizing for 396 m² (4,263 sq ft) — Nordic / Scandinavia (-20°C Design, SE/NO/FI/DK)
Thermal heat loss calculation, recommended heat pump capacity (kW, BTU/h & HVAC Tons), SCOP efficiency, and annual electricity consumption.
Recommended Heat Pump19.3 kW65,854 BTU/h (5.49 Tons)
Annual Electricity Usage14,292 kWh/yrDelivers 48,594 kWh Heat (SCOP 3.4)
Savings vs Direct Electric34,302 kWh/yrSpecific Load: 47.2 W/m²
Electrical Circuit (230V)45 A BreakerPeak Compressor Input: 7.42 kW
Thermal & Electrical Specification Table (396 m² / 4,263 sq ft)
| Heated Floor Area | 396 m² (4,263 sq ft) |
| Climate Zone & Design Outdoor Temp | Nordic / Scandinavia (-20°C Design, SE/NO/FI/DK) |
| Building Insulation Envelope | Modern / New Build Insulation (35 W/m² Base) (47.2 W/m² Peak) |
| Peak Space Heating Load | 18.69 kW Thermal |
| Recommended Heat Pump Output (Incl. DHW) | 19.3 kW (65,854 BTU/h · 5.49 Tons) |
| Seasonal Coefficient of Performance (SCOP) | 3.4 (340%–450% Seasonal Efficiency) |
| Annual Heat Demand vs Electricity Consumed | 48,594 kWh Heat → 14,292 kWh Electricity |
Frequently Asked Questions
What kW size heat pump do I need for a 396 m² (4263 sq ft) house?
For a 396 m² (4263 sq ft) building with Modern / New Build Insulation (35 W/m² Base) in Nordic / Scandinavia (-20°C Design, SE/NO/FI/DK), the peak space heating load is 18.69 kW (47.2 W/m²). Including domestic hot water allowance, a 19.3 kW (65,854 BTU/h / 5.49 Ton) heat pump is recommended.
How many kWh of electricity does a 19.3 kW heat pump use per year?
With a Seasonal Coefficient of Performance (SCOP) of 3.4 over 2600 full-load equivalent heating hours, the heat pump consumes approximately 14,292 kWh of electricity per year to deliver 48,594 kWh of heat — saving 34,302 kWh/year compared to direct electric radiators.
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