Heat Pump Sizing for 348 m² (3,746 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 Pump25.5 kW87,010 BTU/h (7.25 Tons)
Annual Electricity Usage17,061 kWh/yrDelivers 59,712 kWh Heat (SCOP 3.5)
Savings vs Direct Electric42,651 kWh/yrSpecific Load: 71.5 W/m²
Electrical Circuit (230V)60 A BreakerPeak Compressor Input: 9.44 kW
Thermal & Electrical Specification Table (348 m² / 3,746 sq ft)
| Heated Floor Area | 348 m² (3,746 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 | 24.88 kW Thermal |
| Recommended Heat Pump Output (Incl. DHW) | 25.5 kW (87,010 BTU/h · 7.25 Tons) |
| Seasonal Coefficient of Performance (SCOP) | 3.5 (340%–450% Seasonal Efficiency) |
| Annual Heat Demand vs Electricity Consumed | 59,712 kWh Heat → 17,061 kWh Electricity |
Frequently Asked Questions
What kW size heat pump do I need for a 348 m² (3746 sq ft) house?
For a 348 m² (3746 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 24.88 kW (71.5 W/m²). Including domestic hot water allowance, a 25.5 kW (87,010 BTU/h / 7.25 Ton) heat pump is recommended.
How many kWh of electricity does a 25.5 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 17,061 kWh of electricity per year to deliver 59,712 kWh of heat — saving 42,651 kWh/year compared to direct electric radiators.
Compare Other Home Sizes & Climate Zones
60 m² (646 ft²) Heat Pump80 m² (861 ft²) Heat Pump100 m² (1076 ft²) Heat Pump120 m² (1292 ft²) Heat Pump140 m² (1507 ft²) Heat Pump160 m² (1722 ft²) Heat Pump180 m² (1938 ft²) Heat Pump200 m² (2153 ft²) Heat Pump250 m² (2691 ft²) Heat Pump300 m² (3229 ft²) Heat Pump348 m² in Nordic / Scandinavia348 m² in Central Europe / DACH348 m² in UK & Temperate Maritime348 m² in US Sunbelt & Mediterranean348 m² in Australia & Mild APAC