Heat Pump Sizing for 324 m² (3,488 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 Pump15.3 kW52,206 BTU/h (4.35 Tons)
Annual Electricity Usage10,107 kWh/yrDelivers 35,376 kWh Heat (SCOP 3.5)
Savings vs Direct Electric25,269 kWh/yrSpecific Load: 45.5 W/m²
Electrical Circuit (230V)32 A BreakerPeak Compressor Input: 5.67 kW
Thermal & Electrical Specification Table (324 m² / 3,488 sq ft)
| Heated Floor Area | 324 m² (3,488 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 | 14.74 kW Thermal |
| Recommended Heat Pump Output (Incl. DHW) | 15.3 kW (52,206 BTU/h · 4.35 Tons) |
| Seasonal Coefficient of Performance (SCOP) | 3.5 (340%–450% Seasonal Efficiency) |
| Annual Heat Demand vs Electricity Consumed | 35,376 kWh Heat → 10,107 kWh Electricity |
Frequently Asked Questions
What kW size heat pump do I need for a 324 m² (3488 sq ft) house?
For a 324 m² (3488 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 14.74 kW (45.5 W/m²). Including domestic hot water allowance, a 15.3 kW (52,206 BTU/h / 4.35 Ton) heat pump is recommended.
How many kWh of electricity does a 15.3 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 10,107 kWh of electricity per year to deliver 35,376 kWh of heat — saving 25,269 kWh/year compared to direct electric radiators.
Compare Other Home Sizes & Climate Zones
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