Heat Pump Sizing for 154 m² (1,658 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 Pump5.2 kW17,743 BTU/h (1.48 Tons)
Annual Electricity Usage1,565 kWh/yrDelivers 6,885 kWh Heat (SCOP 4.4)
Savings vs Direct Electric5,320 kWh/yrSpecific Load: 29.8 W/m²
Electrical Circuit (230V)10 A BreakerPeak Compressor Input: 1.44 kW
Thermal & Electrical Specification Table (154 m² / 1,658 sq ft)
| Heated Floor Area | 154 m² (1,658 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 | 4.59 kW Thermal |
| Recommended Heat Pump Output (Incl. DHW) | 5.2 kW (17,743 BTU/h · 1.48 Tons) |
| Seasonal Coefficient of Performance (SCOP) | 4.4 (340%–450% Seasonal Efficiency) |
| Annual Heat Demand vs Electricity Consumed | 6,885 kWh Heat → 1,565 kWh Electricity |
Frequently Asked Questions
What kW size heat pump do I need for a 154 m² (1658 sq ft) house?
For a 154 m² (1658 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 4.59 kW (29.8 W/m²). Including domestic hot water allowance, a 5.2 kW (17,743 BTU/h / 1.48 Ton) heat pump is recommended.
How many kWh of electricity does a 5.2 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 1,565 kWh of electricity per year to deliver 6,885 kWh of heat — saving 5,320 kWh/year compared to direct electric radiators.
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