Heat Pump Sizing for 428 m² (4,607 sq ft) — US Sunbelt & Mediterranean (TX/FL/CA/ES/IT)
Thermal heat loss calculation, recommended heat pump capacity (kW, BTU/h & HVAC Tons), SCOP efficiency, and annual electricity consumption.
Recommended Heat Pump31.5 kW107,482 BTU/h (8.96 Tons)
Annual Electricity Usage10,534 kWh/yrDelivers 46,350 kWh Heat (SCOP 4.4)
Savings vs Direct Electric35,816 kWh/yrSpecific Load: 72.2 W/m²
Electrical Circuit (230V)50 A BreakerPeak Compressor Input: 8.75 kW
Thermal & Electrical Specification Table (428 m² / 4,607 sq ft)
| Heated Floor Area | 428 m² (4,607 sq ft) |
| Climate Zone & Design Outdoor Temp | US Sunbelt & Mediterranean (TX/FL/CA/ES/IT) |
| Building Insulation Envelope | Older Uninsulated Building (85 W/m² Base) (72.2 W/m² Peak) |
| Peak Space Heating Load | 30.9 kW Thermal |
| Recommended Heat Pump Output (Incl. DHW) | 31.5 kW (107,482 BTU/h · 8.96 Tons) |
| Seasonal Coefficient of Performance (SCOP) | 4.4 (340%–450% Seasonal Efficiency) |
| Annual Heat Demand vs Electricity Consumed | 46,350 kWh Heat → 10,534 kWh Electricity |
Frequently Asked Questions
What kW size heat pump do I need for a 428 m² (4607 sq ft) house?
For a 428 m² (4607 sq ft) building with Older Uninsulated Building (85 W/m² Base) in US Sunbelt & Mediterranean (TX/FL/CA/ES/IT), the peak space heating load is 30.9 kW (72.2 W/m²). Including domestic hot water allowance, a 31.5 kW (107,482 BTU/h / 8.96 Ton) heat pump is recommended.
How many kWh of electricity does a 31.5 kW heat pump use per year?
With a Seasonal Coefficient of Performance (SCOP) of 4.4 over 1500 full-load equivalent heating hours, the heat pump consumes approximately 10,534 kWh of electricity per year to deliver 46,350 kWh of heat — saving 35,816 kWh/year compared to direct electric radiators.
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