Heat Pump Sizing for 340 m² (3,660 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 Pump25.2 kW85,986 BTU/h (7.17 Tons)
Annual Electricity Usage8,369 kWh/yrDelivers 36,825 kWh Heat (SCOP 4.4)
Savings vs Direct Electric28,456 kWh/yrSpecific Load: 72.2 W/m²
Electrical Circuit (230V)40 A BreakerPeak Compressor Input: 7.0 kW
Thermal & Electrical Specification Table (340 m² / 3,660 sq ft)
| Heated Floor Area | 340 m² (3,660 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 | 24.55 kW Thermal |
| Recommended Heat Pump Output (Incl. DHW) | 25.2 kW (85,986 BTU/h · 7.17 Tons) |
| Seasonal Coefficient of Performance (SCOP) | 4.4 (340%–450% Seasonal Efficiency) |
| Annual Heat Demand vs Electricity Consumed | 36,825 kWh Heat → 8,369 kWh Electricity |
Frequently Asked Questions
What kW size heat pump do I need for a 340 m² (3660 sq ft) house?
For a 340 m² (3660 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 24.55 kW (72.2 W/m²). Including domestic hot water allowance, a 25.2 kW (85,986 BTU/h / 7.17 Ton) heat pump is recommended.
How many kWh of electricity does a 25.2 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 8,369 kWh of electricity per year to deliver 36,825 kWh of heat — saving 28,456 kWh/year compared to direct electric radiators.
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