Heat Pump Sizing for 38 m² (409 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 Pump3.4 kW11,601 BTU/h (0.97 Tons)
Annual Electricity Usage2,156 kWh/yrDelivers 7,332 kWh Heat (SCOP 3.4)
Savings vs Direct Electric5,176 kWh/yrSpecific Load: 74.2 W/m²
Electrical Circuit (230V)10 A BreakerPeak Compressor Input: 1.31 kW
Thermal & Electrical Specification Table (38 m² / 409 sq ft)
| Heated Floor Area | 38 m² (409 sq ft) |
| Climate Zone & Design Outdoor Temp | Nordic / Scandinavia (-20°C Design, SE/NO/FI/DK) |
| Building Insulation Envelope | Standard Double-Glazed Insulation (55 W/m² Base) (74.2 W/m² Peak) |
| Peak Space Heating Load | 2.82 kW Thermal |
| Recommended Heat Pump Output (Incl. DHW) | 3.4 kW (11,601 BTU/h · 0.97 Tons) |
| Seasonal Coefficient of Performance (SCOP) | 3.4 (340%–450% Seasonal Efficiency) |
| Annual Heat Demand vs Electricity Consumed | 7,332 kWh Heat → 2,156 kWh Electricity |
Frequently Asked Questions
What kW size heat pump do I need for a 38 m² (409 sq ft) house?
For a 38 m² (409 sq ft) building with Standard Double-Glazed Insulation (55 W/m² Base) in Nordic / Scandinavia (-20°C Design, SE/NO/FI/DK), the peak space heating load is 2.82 kW (74.2 W/m²). Including domestic hot water allowance, a 3.4 kW (11,601 BTU/h / 0.97 Ton) heat pump is recommended.
How many kWh of electricity does a 3.4 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 2,156 kWh of electricity per year to deliver 7,332 kWh of heat — saving 5,176 kWh/year compared to direct electric radiators.
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