Heat Pump Sizing for 380 m² (4,090 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 Pump18.5 kW63,125 BTU/h (5.26 Tons)
Annual Electricity Usage13,719 kWh/yrDelivers 46,644 kWh Heat (SCOP 3.4)
Savings vs Direct Electric32,925 kWh/yrSpecific Load: 47.2 W/m²
Electrical Circuit (230V)40 A BreakerPeak Compressor Input: 7.12 kW
Thermal & Electrical Specification Table (380 m² / 4,090 sq ft)
| Heated Floor Area | 380 m² (4,090 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 | 17.94 kW Thermal |
| Recommended Heat Pump Output (Incl. DHW) | 18.5 kW (63,125 BTU/h · 5.26 Tons) |
| Seasonal Coefficient of Performance (SCOP) | 3.4 (340%–450% Seasonal Efficiency) |
| Annual Heat Demand vs Electricity Consumed | 46,644 kWh Heat → 13,719 kWh Electricity |
Frequently Asked Questions
What kW size heat pump do I need for a 380 m² (4090 sq ft) house?
For a 380 m² (4090 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 17.94 kW (47.2 W/m²). Including domestic hot water allowance, a 18.5 kW (63,125 BTU/h / 5.26 Ton) heat pump is recommended.
How many kWh of electricity does a 18.5 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 13,719 kWh of electricity per year to deliver 46,644 kWh of heat — saving 32,925 kWh/year compared to direct electric radiators.
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