Spurred by the UK’s 2050 net-zero target for carbon emissions and worries about the effects of climate change, more and more homeowners are seeking effective ways to shrink their environmental impact.

Heating is one of the biggest contributors to household carbon emissions, thanks to gas and oil boilers emitting significant amounts of carbon dioxide (CO₂) each year. In fact, according to the latest figures from the National Audit Office, heating the UK’s 28 million homes accounts for roughly 18% of all UK greenhouse gas emissions annually.

A cleaner alternative that’s growing in popularity is the air source heat pump (ASHP). Offering impressive efficiency and much lower emissions than traditional heating systems, ASHPs are key to a greener future. 

But what exactly is the carbon footprint of an air source heat pump? And what kind of air source heat pump carbon savings can you enjoy after making the switch?

At Adlår Castra UK, we specialise in helping homeowners embrace low-carbon heating solutions. Let’s explore how a market-leading air source heat pump can significantly cut your home’s carbon emissions — and how you can take the next step with us.

How Do Air Source Heat Pumps Work?

Air source heat pumps operate on a simple yet highly efficient principle: they capture heat from the outside air and use it to provide heating and hot water indoors. Unlike gas and oil boilers, which burn harmful fossil fuels to generate heat, heat pumps transform existing heat using electricity.

The efficiency of an air source heat pump is measured by its Coefficient of Performance (COP). A typical ASHP has a COP of 3 – 4, meaning that for every 1 kWh of electricity it consumes, it produces 3 – 4 kilowatt-hours (kWh) of heat. This makes them far more energy-efficient than even the most modern condensing, which typically operate at 94% efficiency at best.

While air source heat pumps do consume electricity (which carries its own carbon footprint), they produce no direct emissions on-site. By sourcing electricity from renewables, homeowners can further reduce — or even eliminate — the carbon footprint of an air source heat pump.

Comparing the Carbon Footprint of an Air Source Heat Pump vs. a Conventional Boiler

Conventional Boiler CO₂ Emissions

Burning natural gas is by far the most common method of heating our nation’s homes. However, the average gas boiler (of which there are 23 million in the UK) emits approximately 2.2 tonnes of CO₂ annually, roughly the same as 7 transatlantic flights! What’s more, inefficient or ageing boilers often produce much higher emissions.

Oil boilers have an even worse carbon footprint. Each one generates 4 to 6 tonnes of CO₂ per year, not to mention their higher running costs and vulnerability to volatile oil prices.

Air Source Heat Pump CO₂ Emissions 

In contrast, the carbon footprint of an air source heat pump is much smaller. Unlike gas and oil boilers, ASHPs do not generate CO₂ on-site, but because they use electricity, they still have an indirect carbon footprint.

Currently, the average carbon intensity of the UK’s electricity grid sits at around 124 grams of CO₂ per kWh (although you can check live data here). A typical UK household heat pump requires approximately 4,000 kWh annually, which translates to roughly 496 kilograms (or 0.496 tonnes) of CO₂ emissions per year — a fraction of the output from gas or oil boilers.

For those committed to maximising air source heat pump carbon savings, choosing a 100% renewable electricity tariff or installing solar panels rather than relying on the grid for energy can effectively bring emissions down to zero.

Total Carbon Savings Per Household

According to the Climate Change Committee, switching from a gas boiler to an air source heat pump results in annual carbon savings of around 2 tonnes of CO₂. 

Households moving away from oil can expect even greater savings — potentially reducing emissions by 3 to 5 tonnes per year. Over the typical 20-year lifespan of an air source heat pump, this equates to between 60 and 100 tonnes of carbon dioxide avoided per household — a powerful contribution towards the UK’s net-zero goal.

The air source heat pump carbon savings achieved not only benefit the environment but also future-proof homes against rising energy costs and incoming carbon taxes.

The Role of Renewable Energy in Cutting Heat Pump Emissions

The true carbon footprint of an air source heat pump is closely tied to the energy that powers it. As the UK electricity grid continues to move towards renewable energy sources, the emissions associated with running heat pumps are decreasing.

How Grid Decarbonisation is Making Heat Pumps Greener

The transformation of the UK’s electricity grid has been dramatic. In 2010, grid electricity had a carbon intensity of just over 450 grams CO₂ per kWh. Fast forward to today, and that figure has dropped to 150–180 grams — largely thanks to investment in wind, solar, and nuclear power.

Looking ahead, the UK aims to achieve a fully decarbonised electricity grid by 2035. As a result, the carbon footprint of an air source heat pump will continue to shrink, meaning low- or zero-carbon heat pumps will be standard. 

Using Solar Panels to Power Heat Pumps

For homeowners looking to maximise air source heat pump carbon savings, installing solar panels offers an ideal solution. By generating renewable electricity on-site, it becomes possible to power your heat pump with zero-carbon energy. 

This not only reduces reliance on the grid and fossil fuel-generated electricity, but also ensures that your heating system remains resilient against fluctuating energy prices. In this way, you can achieve long-term energy savings as well as lowering household CO₂ emissions.

At Adlår, we provide expert advice on how to best integrate solar technology with your heating system, helping you maximise both environmental and financial benefits.

Carbon Footprint Reduction Beyond Heating

Installing an air source heat pump doesn’t just cut emissions from heating. It also opens doors to additional household carbon savings, thanks to:

• Hot Water Heating – Market-leading heat pumps can replace gas water heaters, further reducing CO₂ emissions.
• Smart Thermostat Integration – Heat pumps with integrated smart controls can optimise heating schedules and prevent unnecessary energy use.
• Improved Energy Efficiency – Many homeowners improve their insulation and energy habits when switching from a conventional boiler, amplifying overall air source heat pump carbon savings.

Common Questions About the Carbon Footprint of an Air Source Heat Pump

Q: Are air source heat pumps really better for the environment?

A: Yes. Even when running on standard grid electricity, ASHPs reduce heating emissions by 60 – 80% compared to gas boilers. As the electricity grid becomes greener, their impact improves further.

Q: How much CO₂ does the UK save if more homes switch?

A: Air source heat pump carbon savings can be significant. If one every UK home switched to an air source heat pump instead of a gas boiler, it would save 54 million tonnes of CO₂ annually.

Q: Do heat pumps work in cold weather?

A: Yes. Modern air source heat pumps operate efficiently even at temperatures as low as -15°C, making them suitable for UK winters.

Q: What’s the best way to make a heat pump carbon-neutral?

A: The best way to reduce or eliminate the carbon footprint of an air source heat pump is to use a 100% renewable electricity tariff or install solar panels to generate on-site clean energy.

Make the Switch to a Low-Carbon Future with Adlår

Switching to an air source heat pump is one of the most effective ways you can reduce your carbon footprint as a homeowner. With significantly lower emissions than gas and oil boilers, heat pumps play a crucial role in the UK’s transition to cleaner, more sustainable heating.

At Adlår, we are dedicated to supporting homeowners through every stage of the transition to low-carbon heating. Our team provides an expert consultation tailored to the unique needs of your property, manages your application for the £7,500 Boiler Upgrade Scheme grant, and carries out a professional, high-quality installation. We can also advise on how to make the most of renewable energy tariffs or integrate solar panels for even greater carbon savings.

By choosing our dual heat pump system, you are not only investing in more efficient, environmentally friendly heating — you are taking a decisive step towards a low-carbon future.

If you’re ready to enjoy the low carbon footprint of an air source heat pump, contact Adlår today for a free consultation and installation quote.