Heat Pump Sizing for 428 m² (4,607 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 Pump20.1 kW68,584 BTU/h (5.72 Tons)
Annual Electricity Usage13,351 kWh/yrDelivers 46,728 kWh Heat (SCOP 3.5)
Savings vs Direct Electric33,377 kWh/yrSpecific Load: 45.5 W/m²
Electrical Circuit (230V)45 A BreakerPeak Compressor Input: 7.44 kW
Thermal & Electrical Specification Table (428 m² / 4,607 sq ft)
| Heated Floor Area | 428 m² (4,607 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 | 19.47 kW Thermal |
| Recommended Heat Pump Output (Incl. DHW) | 20.1 kW (68,584 BTU/h · 5.72 Tons) |
| Seasonal Coefficient of Performance (SCOP) | 3.5 (340%–450% Seasonal Efficiency) |
| Annual Heat Demand vs Electricity Consumed | 46,728 kWh Heat → 13,351 kWh Electricity |
Frequently Asked Questions
What kW size heat pump do I need for a 428 m² (4607 sq ft) house?
For a 428 m² (4607 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 19.47 kW (45.5 W/m²). Including domestic hot water allowance, a 20.1 kW (68,584 BTU/h / 5.72 Ton) heat pump is recommended.
How many kWh of electricity does a 20.1 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 13,351 kWh of electricity per year to deliver 46,728 kWh of heat — saving 33,377 kWh/year compared to direct electric radiators.
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