Heat Pump Sizing for 24 m² (258 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 Pump2.3 kW7,848 BTU/h (0.65 Tons)
Annual Electricity Usage590 kWh/yrDelivers 2,595 kWh Heat (SCOP 4.4)
Savings vs Direct Electric2,005 kWh/yrSpecific Load: 72.2 W/m²
Electrical Circuit (230V)6 A BreakerPeak Compressor Input: 0.64 kW
Thermal & Electrical Specification Table (24 m² / 258 sq ft)
| Heated Floor Area | 24 m² (258 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 | 1.73 kW Thermal |
| Recommended Heat Pump Output (Incl. DHW) | 2.3 kW (7,848 BTU/h · 0.65 Tons) |
| Seasonal Coefficient of Performance (SCOP) | 4.4 (340%–450% Seasonal Efficiency) |
| Annual Heat Demand vs Electricity Consumed | 2,595 kWh Heat → 590 kWh Electricity |
Frequently Asked Questions
What kW size heat pump do I need for a 24 m² (258 sq ft) house?
For a 24 m² (258 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 1.73 kW (72.2 W/m²). Including domestic hot water allowance, a 2.3 kW (7,848 BTU/h / 0.65 Ton) heat pump is recommended.
How many kWh of electricity does a 2.3 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 590 kWh of electricity per year to deliver 2,595 kWh of heat — saving 2,005 kWh/year compared to direct electric radiators.
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