Heat Pump Sizing for 612 m² (6,588 sq ft) — US North & Canada Cold (-18°C Design, NY/IL/MI/ON)
Thermal heat loss calculation, recommended heat pump capacity (kW, BTU/h & HVAC Tons), SCOP efficiency, and annual electricity consumption.
Recommended Heat Pump28.5 kW97,246 BTU/h (8.1 Tons)
Annual Electricity Usage19,097 kWh/yrDelivers 66,840 kWh Heat (SCOP 3.5)
Savings vs Direct Electric47,743 kWh/yrSpecific Load: 45.5 W/m²
Electrical Circuit (230V)60 A BreakerPeak Compressor Input: 10.56 kW
Thermal & Electrical Specification Table (612 m² / 6,588 sq ft)
| Heated Floor Area | 612 m² (6,588 sq ft) |
| Climate Zone & Design Outdoor Temp | US North & Canada Cold (-18°C Design, NY/IL/MI/ON) |
| Building Insulation Envelope | Modern / New Build Insulation (35 W/m² Base) (45.5 W/m² Peak) |
| Peak Space Heating Load | 27.85 kW Thermal |
| Recommended Heat Pump Output (Incl. DHW) | 28.5 kW (97,246 BTU/h · 8.1 Tons) |
| Seasonal Coefficient of Performance (SCOP) | 3.5 (340%–450% Seasonal Efficiency) |
| Annual Heat Demand vs Electricity Consumed | 66,840 kWh Heat → 19,097 kWh Electricity |
Frequently Asked Questions
What kW size heat pump do I need for a 612 m² (6588 sq ft) house?
For a 612 m² (6588 sq ft) building with Modern / New Build Insulation (35 W/m² Base) in US North & Canada Cold (-18°C Design, NY/IL/MI/ON), the peak space heating load is 27.85 kW (45.5 W/m²). Including domestic hot water allowance, a 28.5 kW (97,246 BTU/h / 8.1 Ton) heat pump is recommended.
How many kWh of electricity does a 28.5 kW heat pump use per year?
With a Seasonal Coefficient of Performance (SCOP) of 3.5 over 2400 full-load equivalent heating hours, the heat pump consumes approximately 19,097 kWh of electricity per year to deliver 66,840 kWh of heat — saving 47,743 kWh/year compared to direct electric radiators.
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