Heat Pump Sizing for 300 m² (3,229 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 Pump9.5 kW32,415 BTU/h (2.7 Tons)
Annual Electricity Usage3,048 kWh/yrDelivers 13,410 kWh Heat (SCOP 4.4)
Savings vs Direct Electric10,362 kWh/yrSpecific Load: 29.8 W/m²
Electrical Circuit (230V)15 A BreakerPeak Compressor Input: 2.64 kW
Thermal & Electrical Specification Table (300 m² / 3,229 sq ft)
| Heated Floor Area | 300 m² (3,229 sq ft) |
| Climate Zone & Design Outdoor Temp | US Sunbelt & Mediterranean (TX/FL/CA/ES/IT) |
| Building Insulation Envelope | Modern / New Build Insulation (35 W/m² Base) (29.8 W/m² Peak) |
| Peak Space Heating Load | 8.94 kW Thermal |
| Recommended Heat Pump Output (Incl. DHW) | 9.5 kW (32,415 BTU/h · 2.7 Tons) |
| Seasonal Coefficient of Performance (SCOP) | 4.4 (340%–450% Seasonal Efficiency) |
| Annual Heat Demand vs Electricity Consumed | 13,410 kWh Heat → 3,048 kWh Electricity |
Frequently Asked Questions
What kW size heat pump do I need for a 300 m² (3229 sq ft) house?
For a 300 m² (3229 sq ft) building with Modern / New Build Insulation (35 W/m² Base) in US Sunbelt & Mediterranean (TX/FL/CA/ES/IT), the peak space heating load is 8.94 kW (29.8 W/m²). Including domestic hot water allowance, a 9.5 kW (32,415 BTU/h / 2.7 Ton) heat pump is recommended.
How many kWh of electricity does a 9.5 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 3,048 kWh of electricity per year to deliver 13,410 kWh of heat — saving 10,362 kWh/year compared to direct electric radiators.
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