Heat Pump Sizing for 128 m² (1,378 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 Pump9.8 kW33,439 BTU/h (2.79 Tons)
Annual Electricity Usage6,274 kWh/yrDelivers 21,960 kWh Heat (SCOP 3.5)
Savings vs Direct Electric15,686 kWh/yrSpecific Load: 71.5 W/m²
Electrical Circuit (230V)20 A BreakerPeak Compressor Input: 3.63 kW
Thermal & Electrical Specification Table (128 m² / 1,378 sq ft)
| Heated Floor Area | 128 m² (1,378 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 | 9.15 kW Thermal |
| Recommended Heat Pump Output (Incl. DHW) | 9.8 kW (33,439 BTU/h · 2.79 Tons) |
| Seasonal Coefficient of Performance (SCOP) | 3.5 (340%–450% Seasonal Efficiency) |
| Annual Heat Demand vs Electricity Consumed | 21,960 kWh Heat → 6,274 kWh Electricity |
Frequently Asked Questions
What kW size heat pump do I need for a 128 m² (1378 sq ft) house?
For a 128 m² (1378 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 9.15 kW (71.5 W/m²). Including domestic hot water allowance, a 9.8 kW (33,439 BTU/h / 2.79 Ton) heat pump is recommended.
How many kWh of electricity does a 9.8 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 6,274 kWh of electricity per year to deliver 21,960 kWh of heat — saving 15,686 kWh/year compared to direct electric radiators.
Compare Other Home Sizes & Climate Zones
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