Heat Pump Sizing for 340 m² (3,660 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 Pump38.2 kW130,344 BTU/h (10.86 Tons)
Annual Electricity Usage25,762 kWh/yrDelivers 90,168 kWh Heat (SCOP 3.5)
Savings vs Direct Electric64,406 kWh/yrSpecific Load: 110.5 W/m²
Electrical Circuit (230V)80 A BreakerPeak Compressor Input: 14.15 kW
Thermal & Electrical Specification Table (340 m² / 3,660 sq ft)
| Heated Floor Area | 340 m² (3,660 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 | 37.57 kW Thermal |
| Recommended Heat Pump Output (Incl. DHW) | 38.2 kW (130,344 BTU/h · 10.86 Tons) |
| Seasonal Coefficient of Performance (SCOP) | 3.5 (340%–450% Seasonal Efficiency) |
| Annual Heat Demand vs Electricity Consumed | 90,168 kWh Heat → 25,762 kWh Electricity |
Frequently Asked Questions
What kW size heat pump do I need for a 340 m² (3660 sq ft) house?
For a 340 m² (3660 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 37.57 kW (110.5 W/m²). Including domestic hot water allowance, a 38.2 kW (130,344 BTU/h / 10.86 Ton) heat pump is recommended.
How many kWh of electricity does a 38.2 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 25,762 kWh of electricity per year to deliver 90,168 kWh of heat — saving 64,406 kWh/year compared to direct electric radiators.
Compare Other Home Sizes & Climate Zones
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