Heat Pump Sizing for 64 m² (689 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 Pump6.8 kW23,203 BTU/h (1.93 Tons)
Annual Electricity Usage3,454 kWh/yrDelivers 13,125 kWh Heat (SCOP 3.8)
Savings vs Direct Electric9,671 kWh/yrSpecific Load: 97.7 W/m²
Electrical Circuit (230V)13 A BreakerPeak Compressor Input: 2.27 kW
Thermal & Electrical Specification Table (64 m² / 689 sq ft)
| Heated Floor Area | 64 m² (689 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 | 6.25 kW Thermal |
| Recommended Heat Pump Output (Incl. DHW) | 6.8 kW (23,203 BTU/h · 1.93 Tons) |
| Seasonal Coefficient of Performance (SCOP) | 3.8 (340%–450% Seasonal Efficiency) |
| Annual Heat Demand vs Electricity Consumed | 13,125 kWh Heat → 3,454 kWh Electricity |
Frequently Asked Questions
What kW size heat pump do I need for a 64 m² (689 sq ft) house?
For a 64 m² (689 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 6.25 kW (97.7 W/m²). Including domestic hot water allowance, a 6.8 kW (23,203 BTU/h / 1.93 Ton) heat pump is recommended.
How many kWh of electricity does a 6.8 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 3,454 kWh of electricity per year to deliver 13,125 kWh of heat — saving 9,671 kWh/year compared to direct electric radiators.
Compare Other Home Sizes & Climate Zones
60 m² (646 ft²) Heat Pump80 m² (861 ft²) Heat Pump100 m² (1076 ft²) Heat Pump120 m² (1292 ft²) Heat Pump140 m² (1507 ft²) Heat Pump160 m² (1722 ft²) Heat Pump180 m² (1938 ft²) Heat Pump200 m² (2153 ft²) Heat Pump250 m² (2691 ft²) Heat Pump300 m² (3229 ft²) Heat Pump64 m² in Nordic / Scandinavia64 m² in UK & Temperate Maritime64 m² in US North & Canada Cold64 m² in US Sunbelt & Mediterranean64 m² in Australia & Mild APAC