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Efficiency is measured using the Coefficient of Performance (COP). A modern air source heat pump typically delivers a COP of 3 to 5, meaning that for every 1 kWh of electricity consumed to run the compressor and fan, the system delivers 3 to 5 kWh of heat. That’s because the system isn’t generating heat from scratch — it’s relocating heat that already exists in the air, making it far more efficient than electric resistance heating or gas boilers.
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Benefits of Aerothermal Heating
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- Lower running costs compared to oil, propane, or resistance electric heating
- Reduced carbon footprint, especially when paired with solar panels or a renewable electricity tariff
- Dual function: many systems heat in winter and cool in summer
- Long lifespan: typically 15–20 years with proper maintenance
- Government incentives: many countries offer subsidies, tax credits, or grants for installation
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Limitations to Consider
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- Higher upfront installation cost than a gas boiler
- Efficiency drops somewhat in extreme cold (though modern units still perform well down to -20°C)
- Requires outdoor space for the unit
- Works best with good home insulation and low-temperature heat emitters (underfloor heating or oversized radiators)
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