Heat Pump Sizing for 308 m² (3,315 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 Pump22.8 kW77,797 BTU/h (6.48 Tons)
Annual Electricity Usage7,582 kWh/yrDelivers 33,360 kWh Heat (SCOP 4.4)
Savings vs Direct Electric25,778 kWh/yrSpecific Load: 72.2 W/m²
Electrical Circuit (230V)35 A BreakerPeak Compressor Input: 6.33 kW
Thermal & Electrical Specification Table (308 m² / 3,315 sq ft)
| Heated Floor Area | 308 m² (3,315 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 | 22.24 kW Thermal |
| Recommended Heat Pump Output (Incl. DHW) | 22.8 kW (77,797 BTU/h · 6.48 Tons) |
| Seasonal Coefficient of Performance (SCOP) | 4.4 (340%–450% Seasonal Efficiency) |
| Annual Heat Demand vs Electricity Consumed | 33,360 kWh Heat → 7,582 kWh Electricity |
Frequently Asked Questions
What kW size heat pump do I need for a 308 m² (3315 sq ft) house?
For a 308 m² (3315 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 22.24 kW (72.2 W/m²). Including domestic hot water allowance, a 22.8 kW (77,797 BTU/h / 6.48 Ton) heat pump is recommended.
How many kWh of electricity does a 22.8 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 7,582 kWh of electricity per year to deliver 33,360 kWh of heat — saving 25,778 kWh/year compared to direct electric radiators.
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