Heat Pump Sizing for 356 m² (3,832 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 Pump35.4 kW120,790 BTU/h (10.07 Tons)
Annual Electricity Usage19,221 kWh/yrDelivers 73,038 kWh Heat (SCOP 3.8)
Savings vs Direct Electric53,817 kWh/yrSpecific Load: 97.7 W/m²
Electrical Circuit (230V)70 A BreakerPeak Compressor Input: 11.8 kW
Thermal & Electrical Specification Table (356 m² / 3,832 sq ft)
| Heated Floor Area | 356 m² (3,832 sq ft) |
| Climate Zone & Design Outdoor Temp | Central Europe / DACH (-12°C Design, DE/CH/AT/NL) |
| Building Insulation Envelope | Older Uninsulated Building (85 W/m² Base) (97.7 W/m² Peak) |
| Peak Space Heating Load | 34.78 kW Thermal |
| Recommended Heat Pump Output (Incl. DHW) | 35.4 kW (120,790 BTU/h · 10.07 Tons) |
| Seasonal Coefficient of Performance (SCOP) | 3.8 (340%–450% Seasonal Efficiency) |
| Annual Heat Demand vs Electricity Consumed | 73,038 kWh Heat → 19,221 kWh Electricity |
Frequently Asked Questions
What kW size heat pump do I need for a 356 m² (3832 sq ft) house?
For a 356 m² (3832 sq ft) building with Older Uninsulated Building (85 W/m² Base) in Central Europe / DACH (-12°C Design, DE/CH/AT/NL), the peak space heating load is 34.78 kW (97.7 W/m²). Including domestic hot water allowance, a 35.4 kW (120,790 BTU/h / 10.07 Ton) heat pump is recommended.
How many kWh of electricity does a 35.4 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 19,221 kWh of electricity per year to deliver 73,038 kWh of heat — saving 53,817 kWh/year compared to direct electric radiators.
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