Heat Pump Sizing for 364 m² (3,918 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 Pump40.8 kW139,215 BTU/h (11.6 Tons)
Annual Electricity Usage27,579 kWh/yrDelivers 96,528 kWh Heat (SCOP 3.5)
Savings vs Direct Electric68,949 kWh/yrSpecific Load: 110.5 W/m²
Electrical Circuit (230V)90 A BreakerPeak Compressor Input: 15.11 kW
Thermal & Electrical Specification Table (364 m² / 3,918 sq ft)
| Heated Floor Area | 364 m² (3,918 sq ft) |
| Climate Zone & Design Outdoor Temp | US North & Canada Cold (-18°C Design, NY/IL/MI/ON) |
| Building Insulation Envelope | Older Uninsulated Building (85 W/m² Base) (110.5 W/m² Peak) |
| Peak Space Heating Load | 40.22 kW Thermal |
| Recommended Heat Pump Output (Incl. DHW) | 40.8 kW (139,215 BTU/h · 11.6 Tons) |
| Seasonal Coefficient of Performance (SCOP) | 3.5 (340%–450% Seasonal Efficiency) |
| Annual Heat Demand vs Electricity Consumed | 96,528 kWh Heat → 27,579 kWh Electricity |
Frequently Asked Questions
What kW size heat pump do I need for a 364 m² (3918 sq ft) house?
For a 364 m² (3918 sq ft) building with Older Uninsulated Building (85 W/m² Base) in US North & Canada Cold (-18°C Design, NY/IL/MI/ON), the peak space heating load is 40.22 kW (110.5 W/m²). Including domestic hot water allowance, a 40.8 kW (139,215 BTU/h / 11.6 Ton) heat pump is recommended.
How many kWh of electricity does a 40.8 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 27,579 kWh of electricity per year to deliver 96,528 kWh of heat — saving 68,949 kWh/year compared to direct electric radiators.
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