Heat Pump Sizing for 50 m² (538 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 Pump4.2 kW14,331 BTU/h (1.19 Tons)
Annual Electricity Usage1,231 kWh/yrDelivers 5,415 kWh Heat (SCOP 4.4)
Savings vs Direct Electric4,184 kWh/yrSpecific Load: 72.2 W/m²
Electrical Circuit (230V)10 A BreakerPeak Compressor Input: 1.17 kW
Thermal & Electrical Specification Table (50 m² / 538 sq ft)
| Heated Floor Area | 50 m² (538 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 | 3.61 kW Thermal |
| Recommended Heat Pump Output (Incl. DHW) | 4.2 kW (14,331 BTU/h · 1.19 Tons) |
| Seasonal Coefficient of Performance (SCOP) | 4.4 (340%–450% Seasonal Efficiency) |
| Annual Heat Demand vs Electricity Consumed | 5,415 kWh Heat → 1,231 kWh Electricity |
Frequently Asked Questions
What kW size heat pump do I need for a 50 m² (538 sq ft) house?
For a 50 m² (538 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 3.61 kW (72.2 W/m²). Including domestic hot water allowance, a 4.2 kW (14,331 BTU/h / 1.19 Ton) heat pump is recommended.
How many kWh of electricity does a 4.2 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 1,231 kWh of electricity per year to deliver 5,415 kWh of heat — saving 4,184 kWh/year compared to direct electric radiators.
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