Heat Pump Sizing for 324 m² (3,488 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 Pump37.8 kW128,979 BTU/h (10.75 Tons)
Annual Electricity Usage28,447 kWh/yrDelivers 96,720 kWh Heat (SCOP 3.4)
Savings vs Direct Electric68,273 kWh/yrSpecific Load: 114.8 W/m²
Electrical Circuit (230V)80 A BreakerPeak Compressor Input: 14.54 kW
Thermal & Electrical Specification Table (324 m² / 3,488 sq ft)
| Heated Floor Area | 324 m² (3,488 sq ft) |
| Climate Zone & Design Outdoor Temp | Nordic / Scandinavia (-20°C Design, SE/NO/FI/DK) |
| Building Insulation Envelope | Older Uninsulated Building (85 W/m² Base) (114.8 W/m² Peak) |
| Peak Space Heating Load | 37.2 kW Thermal |
| Recommended Heat Pump Output (Incl. DHW) | 37.8 kW (128,979 BTU/h · 10.75 Tons) |
| Seasonal Coefficient of Performance (SCOP) | 3.4 (340%–450% Seasonal Efficiency) |
| Annual Heat Demand vs Electricity Consumed | 96,720 kWh Heat → 28,447 kWh Electricity |
Frequently Asked Questions
What kW size heat pump do I need for a 324 m² (3488 sq ft) house?
For a 324 m² (3488 sq ft) building with Older Uninsulated Building (85 W/m² Base) in Nordic / Scandinavia (-20°C Design, SE/NO/FI/DK), the peak space heating load is 37.2 kW (114.8 W/m²). Including domestic hot water allowance, a 37.8 kW (128,979 BTU/h / 10.75 Ton) heat pump is recommended.
How many kWh of electricity does a 37.8 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 28,447 kWh of electricity per year to deliver 96,720 kWh of heat — saving 68,273 kWh/year compared to direct electric radiators.
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