Heat Pump Sizing for 250 m² (2,691 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 Pump18.7 kW63,807 BTU/h (5.32 Tons)
Annual Electricity Usage6,153 kWh/yrDelivers 27,075 kWh Heat (SCOP 4.4)
Savings vs Direct Electric20,922 kWh/yrSpecific Load: 72.2 W/m²
Electrical Circuit (230V)30 A BreakerPeak Compressor Input: 5.19 kW
Thermal & Electrical Specification Table (250 m² / 2,691 sq ft)
| Heated Floor Area | 250 m² (2,691 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 | 18.05 kW Thermal |
| Recommended Heat Pump Output (Incl. DHW) | 18.7 kW (63,807 BTU/h · 5.32 Tons) |
| Seasonal Coefficient of Performance (SCOP) | 4.4 (340%–450% Seasonal Efficiency) |
| Annual Heat Demand vs Electricity Consumed | 27,075 kWh Heat → 6,153 kWh Electricity |
Frequently Asked Questions
What kW size heat pump do I need for a 250 m² (2691 sq ft) house?
For a 250 m² (2691 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 18.05 kW (72.2 W/m²). Including domestic hot water allowance, a 18.7 kW (63,807 BTU/h / 5.32 Ton) heat pump is recommended.
How many kWh of electricity does a 18.7 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 6,153 kWh of electricity per year to deliver 27,075 kWh of heat — saving 20,922 kWh/year compared to direct electric radiators.
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