Heat Pump Sizing for 340 m² (3,660 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 Pump25.8 kW88,033 BTU/h (7.34 Tons)
Annual Electricity Usage19,294 kWh/yrDelivers 65,598 kWh Heat (SCOP 3.4)
Savings vs Direct Electric46,304 kWh/yrSpecific Load: 74.2 W/m²
Electrical Circuit (230V)60 A BreakerPeak Compressor Input: 9.92 kW
Thermal & Electrical Specification Table (340 m² / 3,660 sq ft)
| Heated Floor Area | 340 m² (3,660 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 | 25.23 kW Thermal |
| Recommended Heat Pump Output (Incl. DHW) | 25.8 kW (88,033 BTU/h · 7.34 Tons) |
| Seasonal Coefficient of Performance (SCOP) | 3.4 (340%–450% Seasonal Efficiency) |
| Annual Heat Demand vs Electricity Consumed | 65,598 kWh Heat → 19,294 kWh Electricity |
Frequently Asked Questions
What kW size heat pump do I need for a 340 m² (3660 sq ft) house?
For a 340 m² (3660 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 25.23 kW (74.2 W/m²). Including domestic hot water allowance, a 25.8 kW (88,033 BTU/h / 7.34 Ton) heat pump is recommended.
How many kWh of electricity does a 25.8 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 19,294 kWh of electricity per year to deliver 65,598 kWh of heat — saving 46,304 kWh/year compared to direct electric radiators.
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