Heat Pump Sizing for 324 m² (3,488 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 Pump24.0 kW81,891 BTU/h (6.82 Tons)
Annual Electricity Usage7,974 kWh/yrDelivers 35,085 kWh Heat (SCOP 4.4)
Savings vs Direct Electric27,111 kWh/yrSpecific Load: 72.2 W/m²
Electrical Circuit (230V)40 A BreakerPeak Compressor Input: 6.67 kW
Thermal & Electrical Specification Table (324 m² / 3,488 sq ft)
| Heated Floor Area | 324 m² (3,488 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 | 23.39 kW Thermal |
| Recommended Heat Pump Output (Incl. DHW) | 24.0 kW (81,891 BTU/h · 6.82 Tons) |
| Seasonal Coefficient of Performance (SCOP) | 4.4 (340%–450% Seasonal Efficiency) |
| Annual Heat Demand vs Electricity Consumed | 35,085 kWh Heat → 7,974 kWh Electricity |
Frequently Asked Questions
What kW size heat pump do I need for a 324 m² (3488 sq ft) house?
For a 324 m² (3488 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 23.39 kW (72.2 W/m²). Including domestic hot water allowance, a 24.0 kW (81,891 BTU/h / 6.82 Ton) heat pump is recommended.
How many kWh of electricity does a 24.0 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 7,974 kWh of electricity per year to deliver 35,085 kWh of heat — saving 27,111 kWh/year compared to direct electric radiators.
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