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 Pump5.0 kW17,061 BTU/h (1.42 Tons)
Annual Electricity Usage3,334 kWh/yrDelivers 11,336 kWh Heat (SCOP 3.4)
Savings vs Direct Electric8,002 kWh/yrSpecific Load: 114.8 W/m²
Electrical Circuit (230V)13 A BreakerPeak Compressor Input: 1.92 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 | Older Uninsulated Building (85 W/m² Base) (114.8 W/m² Peak) |
| Peak Space Heating Load | 4.36 kW Thermal |
| Recommended Heat Pump Output (Incl. DHW) | 5.0 kW (17,061 BTU/h · 1.42 Tons) |
| Seasonal Coefficient of Performance (SCOP) | 3.4 (340%–450% Seasonal Efficiency) |
| Annual Heat Demand vs Electricity Consumed | 11,336 kWh Heat → 3,334 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 Older Uninsulated Building (85 W/m² Base) in Nordic / Scandinavia (-20°C Design, SE/NO/FI/DK), the peak space heating load is 4.36 kW (114.8 W/m²). Including domestic hot water allowance, a 5.0 kW (17,061 BTU/h / 1.42 Ton) heat pump is recommended.
How many kWh of electricity does a 5.0 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 3,334 kWh of electricity per year to deliver 11,336 kWh of heat — saving 8,002 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 Pump38 m² in Central Europe / DACH38 m² in UK & Temperate Maritime38 m² in US North & Canada Cold38 m² in US Sunbelt & Mediterranean38 m² in Australia & Mild APAC