Heat Pump Sizing for 604 m² (6,501 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 Pump18.6 kW63,466 BTU/h (5.29 Tons)
Annual Electricity Usage6,136 kWh/yrDelivers 27,000 kWh Heat (SCOP 4.4)
Savings vs Direct Electric20,864 kWh/yrSpecific Load: 29.8 W/m²
Electrical Circuit (230V)30 A BreakerPeak Compressor Input: 5.17 kW
Thermal & Electrical Specification Table (604 m² / 6,501 sq ft)
| Heated Floor Area | 604 m² (6,501 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 | 18.0 kW Thermal |
| Recommended Heat Pump Output (Incl. DHW) | 18.6 kW (63,466 BTU/h · 5.29 Tons) |
| Seasonal Coefficient of Performance (SCOP) | 4.4 (340%–450% Seasonal Efficiency) |
| Annual Heat Demand vs Electricity Consumed | 27,000 kWh Heat → 6,136 kWh Electricity |
Frequently Asked Questions
What kW size heat pump do I need for a 604 m² (6501 sq ft) house?
For a 604 m² (6501 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 18.0 kW (29.8 W/m²). Including domestic hot water allowance, a 18.6 kW (63,466 BTU/h / 5.29 Ton) heat pump is recommended.
How many kWh of electricity does a 18.6 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 6,136 kWh of electricity per year to deliver 27,000 kWh of heat — saving 20,864 kWh/year compared to direct electric radiators.
Compare Other Home Sizes & Climate Zones
60 m² (646 ft²) Heat Pump80 m² (861 ft²) Heat Pump100 m² (1076 ft²) Heat Pump120 m² (1292 ft²) Heat Pump140 m² (1507 ft²) Heat Pump160 m² (1722 ft²) Heat Pump180 m² (1938 ft²) Heat Pump200 m² (2153 ft²) Heat Pump250 m² (2691 ft²) Heat Pump300 m² (3229 ft²) Heat Pump604 m² in Nordic / Scandinavia604 m² in Central Europe / DACH604 m² in UK & Temperate Maritime604 m² in US North & Canada Cold604 m² in Australia & Mild APAC