Heat Pump Sizing for 138 m² (1,485 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 Pump16.4 kW55,959 BTU/h (4.66 Tons)
Annual Electricity Usage12,113 kWh/yrDelivers 41,184 kWh Heat (SCOP 3.4)
Savings vs Direct Electric29,071 kWh/yrSpecific Load: 114.8 W/m²
Electrical Circuit (230V)35 A BreakerPeak Compressor Input: 6.31 kW
Thermal & Electrical Specification Table (138 m² / 1,485 sq ft)
| Heated Floor Area | 138 m² (1,485 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 | 15.84 kW Thermal |
| Recommended Heat Pump Output (Incl. DHW) | 16.4 kW (55,959 BTU/h · 4.66 Tons) |
| Seasonal Coefficient of Performance (SCOP) | 3.4 (340%–450% Seasonal Efficiency) |
| Annual Heat Demand vs Electricity Consumed | 41,184 kWh Heat → 12,113 kWh Electricity |
Frequently Asked Questions
What kW size heat pump do I need for a 138 m² (1485 sq ft) house?
For a 138 m² (1485 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 15.84 kW (114.8 W/m²). Including domestic hot water allowance, a 16.4 kW (55,959 BTU/h / 4.66 Ton) heat pump is recommended.
How many kWh of electricity does a 16.4 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 12,113 kWh of electricity per year to deliver 41,184 kWh of heat — saving 29,071 kWh/year compared to direct electric radiators.
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