Heat Pump Sizing for 388 m² (4,176 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 Pump18.8 kW64,148 BTU/h (5.35 Tons)
Annual Electricity Usage6,191 kWh/yrDelivers 27,240 kWh Heat (SCOP 4.4)
Savings vs Direct Electric21,049 kWh/yrSpecific Load: 46.8 W/m²
Electrical Circuit (230V)30 A BreakerPeak Compressor Input: 5.22 kW
Thermal & Electrical Specification Table (388 m² / 4,176 sq ft)
| Heated Floor Area | 388 m² (4,176 sq ft) |
| Climate Zone & Design Outdoor Temp | US Sunbelt & Mediterranean (TX/FL/CA/ES/IT) |
| Building Insulation Envelope | Standard Double-Glazed Insulation (55 W/m² Base) (46.8 W/m² Peak) |
| Peak Space Heating Load | 18.16 kW Thermal |
| Recommended Heat Pump Output (Incl. DHW) | 18.8 kW (64,148 BTU/h · 5.35 Tons) |
| Seasonal Coefficient of Performance (SCOP) | 4.4 (340%–450% Seasonal Efficiency) |
| Annual Heat Demand vs Electricity Consumed | 27,240 kWh Heat → 6,191 kWh Electricity |
Frequently Asked Questions
What kW size heat pump do I need for a 388 m² (4176 sq ft) house?
For a 388 m² (4176 sq ft) building with Standard Double-Glazed Insulation (55 W/m² Base) in US Sunbelt & Mediterranean (TX/FL/CA/ES/IT), the peak space heating load is 18.16 kW (46.8 W/m²). Including domestic hot water allowance, a 18.8 kW (64,148 BTU/h / 5.35 Ton) heat pump is recommended.
How many kWh of electricity does a 18.8 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 6,191 kWh of electricity per year to deliver 27,240 kWh of heat — saving 21,049 kWh/year compared to direct electric radiators.
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