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Compare the carbon footprint of heating your home with an air source heat pump versus a gas boiler. See annual CO2 savings by country.
A heat pump produces 50–75% fewer CO2 emissions than a gas boiler for the same amount of heat. In the UK, switching from a gas boiler to an air source heat pump saves approximately 1,200–1,800 kg CO2 per year. The savings are even larger in countries with clean electricity grids.
720
kg CO2/year
2,640
kg CO2/year
Heat pumps don't generate heat — they move it. By extracting heat from outdoor air (even at temperatures as low as -15°C), a heat pump delivers 2.5–4 kWh of heat for every 1 kWh of electricity consumed. This efficiency ratio (Coefficient of Performance or COP) of 3.0 means a heat pump uses just a third of the energy a gas boiler needs to produce the same warmth. This translates directly into lower carbon emissions.
Since heat pumps run on electricity, their carbon footprint depends heavily on how that electricity is generated. In countries with clean grids (UK at 0.18, Canada at 0.13 kgCO2/kWh), heat pumps save 70–80% of emissions compared to gas boilers. In coal-heavy grids (India at 0.82), the saving is smaller — but even there, the heat pump's 3x efficiency still makes it cleaner than gas in most scenarios.
Heat pumps cost £8,000–£15,000 to install (including upgrades to radiators and insulation), compared to £2,000–£4,000 for a new gas boiler. However, UK government grants (Boiler Upgrade Scheme: £7,500 off), falling installation costs, and rising gas prices are narrowing this gap. Over a 15–20 year lifespan, a heat pump can save 3–6 tonnes of CO2 per year in a mid-carbon grid country — and running costs are converging as electricity prices stabilise and gas prices remain volatile. In India and the US, state and federal subsidies further reduce payback periods.
Modern air-source heat pumps (ASHPs) operate effectively down to -20°C and maintain a COP of 2.0+ even at -15°C. Cold climate models from manufacturers like Mitsubishi, Daikin, and Bosch are specifically engineered for Canadian winters, Scandinavian conditions, and UK cold snaps. Ground-source heat pumps (GSHPs) are even more stable, drawing from the ground which maintains a constant 8–12°C year-round. In cold climates, proper insulation is the most important complement to a heat pump: reducing heat loss by 30–50% roughly doubles the system's effective performance.
Covers practical follow-up questions readers often ask
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