Heat Pump Sizing for 78 m² (840 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 Pump6.2 kW21,155 BTU/h (1.76 Tons)
Annual Electricity Usage3,826 kWh/yrDelivers 13,392 kWh Heat (SCOP 3.5)
Savings vs Direct Electric9,566 kWh/yrSpecific Load: 71.5 W/m²
Electrical Circuit (230V)13 A BreakerPeak Compressor Input: 2.3 kW
Thermal & Electrical Specification Table (78 m² / 840 sq ft)
| Heated Floor Area | 78 m² (840 sq ft) |
| Climate Zone & Design Outdoor Temp | US North & Canada Cold (-18°C Design, NY/IL/MI/ON) |
| Building Insulation Envelope | Standard Double-Glazed Insulation (55 W/m² Base) (71.5 W/m² Peak) |
| Peak Space Heating Load | 5.58 kW Thermal |
| Recommended Heat Pump Output (Incl. DHW) | 6.2 kW (21,155 BTU/h · 1.76 Tons) |
| Seasonal Coefficient of Performance (SCOP) | 3.5 (340%–450% Seasonal Efficiency) |
| Annual Heat Demand vs Electricity Consumed | 13,392 kWh Heat → 3,826 kWh Electricity |
Frequently Asked Questions
What kW size heat pump do I need for a 78 m² (840 sq ft) house?
For a 78 m² (840 sq ft) building with Standard Double-Glazed Insulation (55 W/m² Base) in US North & Canada Cold (-18°C Design, NY/IL/MI/ON), the peak space heating load is 5.58 kW (71.5 W/m²). Including domestic hot water allowance, a 6.2 kW (21,155 BTU/h / 1.76 Ton) heat pump is recommended.
How many kWh of electricity does a 6.2 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 3,826 kWh of electricity per year to deliver 13,392 kWh of heat — saving 9,566 kWh/year compared to direct electric radiators.
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