Heat Pump Sizing for 126 m² (1,356 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 Pump9.9 kW33,780 BTU/h (2.81 Tons)
Annual Electricity Usage7,150 kWh/yrDelivers 24,310 kWh Heat (SCOP 3.4)
Savings vs Direct Electric17,160 kWh/yrSpecific Load: 74.2 W/m²
Electrical Circuit (230V)25 A BreakerPeak Compressor Input: 3.81 kW
Thermal & Electrical Specification Table (126 m² / 1,356 sq ft)
| Heated Floor Area | 126 m² (1,356 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 | 9.35 kW Thermal |
| Recommended Heat Pump Output (Incl. DHW) | 9.9 kW (33,780 BTU/h · 2.81 Tons) |
| Seasonal Coefficient of Performance (SCOP) | 3.4 (340%–450% Seasonal Efficiency) |
| Annual Heat Demand vs Electricity Consumed | 24,310 kWh Heat → 7,150 kWh Electricity |
Frequently Asked Questions
What kW size heat pump do I need for a 126 m² (1356 sq ft) house?
For a 126 m² (1356 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 9.35 kW (74.2 W/m²). Including domestic hot water allowance, a 9.9 kW (33,780 BTU/h / 2.81 Ton) heat pump is recommended.
How many kWh of electricity does a 9.9 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 7,150 kWh of electricity per year to deliver 24,310 kWh of heat — saving 17,160 kWh/year compared to direct electric radiators.
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