Heat Pump Sizing for 324 m² (3,488 sq ft) — Central Europe / DACH (-12°C Design, DE/CH/AT/NL)
Thermal heat loss calculation, recommended heat pump capacity (kW, BTU/h & HVAC Tons), SCOP efficiency, and annual electricity consumption.
Recommended Heat Pump13.6 kW46,405 BTU/h (3.87 Tons)
Annual Electricity Usage7,195 kWh/yrDelivers 27,342 kWh Heat (SCOP 3.8)
Savings vs Direct Electric20,147 kWh/yrSpecific Load: 40.2 W/m²
Electrical Circuit (230V)25 A BreakerPeak Compressor Input: 4.53 kW
Thermal & Electrical Specification Table (324 m² / 3,488 sq ft)
| Heated Floor Area | 324 m² (3,488 sq ft) |
| Climate Zone & Design Outdoor Temp | Central Europe / DACH (-12°C Design, DE/CH/AT/NL) |
| Building Insulation Envelope | Modern / New Build Insulation (35 W/m² Base) (40.2 W/m² Peak) |
| Peak Space Heating Load | 13.02 kW Thermal |
| Recommended Heat Pump Output (Incl. DHW) | 13.6 kW (46,405 BTU/h · 3.87 Tons) |
| Seasonal Coefficient of Performance (SCOP) | 3.8 (340%–450% Seasonal Efficiency) |
| Annual Heat Demand vs Electricity Consumed | 27,342 kWh Heat → 7,195 kWh Electricity |
Frequently Asked Questions
What kW size heat pump do I need for a 324 m² (3488 sq ft) house?
For a 324 m² (3488 sq ft) building with Modern / New Build Insulation (35 W/m² Base) in Central Europe / DACH (-12°C Design, DE/CH/AT/NL), the peak space heating load is 13.02 kW (40.2 W/m²). Including domestic hot water allowance, a 13.6 kW (46,405 BTU/h / 3.87 Ton) heat pump is recommended.
How many kWh of electricity does a 13.6 kW heat pump use per year?
With a Seasonal Coefficient of Performance (SCOP) of 3.8 over 2100 full-load equivalent heating hours, the heat pump consumes approximately 7,195 kWh of electricity per year to deliver 27,342 kWh of heat — saving 20,147 kWh/year compared to direct electric radiators.
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