Air source heat pumps: the environmental impact

Heating our homes accounts for over a third of the UK’s carbon emissions. That’s a big problem—but also a big opportunity.

Switching to an air source heat pump (ASHP) is one of the most effective ways to cut carbon and future-proof your home or building. It’s a smarter, cleaner, and more sustainable choice—and one that more UK homeowners are embracing.

At 21 Degrees, we specialise in designing and installing high-performance air source heat pump systems that work for you and the planet.

Looking to make your home or building more energy efficient? Contact us today to explore your options.

Environmental impact no. 1: reduced carbon emissions

Traditional boilers burn fossil fuels. Air source heat pumps don’t.

ASHPs extract heat from the air—a renewable energy source—and use electricity to transfer it into your home. That means they can heat your property without direct carbon emissions.

• For every unit of electricity used, an ASHP can generate up to three units of heat.
• Even in colder weather, they work efficiently and reliably.
• If your electricity comes from renewable sources, you’re heating your home with close to zero emissions.

The UK has committed to reaching net zero emissions by 2050. Air source heat pumps are a key part of that plan. In fact, government modelling expects millions of homes to switch to heat pumps by 2035 to meet these targets​.

Environmental impact no. 2: improved energy efficiency

Energy efficiency isn’t just about using less—it’s about getting more from what you use.

That’s where the Coefficient of Performance (CoP) comes in. It’s a measure of how much heat a system produces compared to how much energy it consumes. A heat pump can have a COP of 2 in January and 4 in April.

By using SCOP, we can make a more direct comparison by taking into consideration the fluctuating temp over the year. ASHP typically a SCOP of 3-4. GSHP typically a SCOP of 4-5.

That’s 265% more efficient than a gas boiler​

At 21 Degrees, we design every system for the best performance. That means the right unit, the right controls, and the right integration with your home’s layout and insulation.

Want to see what’s possible? Look at how we design systems that work smarter, not harder.

Environmental impact no. 3: lower air pollution

Clean heating equals clean air.

Wood-burning stoves and older boilers release particles and gases that damage air quality. These pollutants can build up inside and outside the home, especially in urban areas.

Air source heat pumps, on the other hand:

• Don’t burn fuel.
• Don’t release smoke or particulates.
• Don’t add to indoor or outdoor air pollution.

That’s better for the planet and your health.

Modern building regulations are already moving towards cleaner systems. By switching to an ASHP, you’re not just ahead of the curve—you’re breathing easier too.

Breathe easier with a cleaner, greener heating system. Talk to 21 Degrees today about your options.

Environmental impact no. 4: sustainable heating for all seasons

One system. All year round.

Air source heat pumps aren’t just for heating. Many models can reverse their cycle to provide cooling in the summer. That means:

• No need for a separate air conditioner
• Less strain on the grid from seasonal demand
• Lower bills over time

And if you pair your ASHP with solar panels, you’ll reduce your energy consumption even further. The two systems complement each other perfectly—especially in well-designed homes.

Learn how solar panels and heat pumps work together.

How to pair an air source heat pump with solar panels

Pairing an ASHP with solar panels lets you:

• Generate electricity for your heat pump.
• Reduce reliance on the grid.
• Cut running costs dramatically.

It’s a great choice for self-builds and deep retrofits. With the right setup, you can heat and cool your home almost entirely using renewable energy.

Need help making it work? Our team designs integrated systems that make the most of your roof space, orientation, and usage patterns.

Financial incentives and support

Worried about the upfront cost? There’s help available.

The Boiler Upgrade Scheme offers up to £7,500 towards the cost of installing an air source heat pump in England and Wales.

Over time, you’ll also save on running costs—especially with energy prices fluctuating.

Find out more about the Boiler Upgrade Scheme.

Additional advantages of air source heat pumps

Still on the fence? Here are a few more reasons to make the switch:

• Long Lifespan: A well-maintained system can last 15–20 years.
• Quiet Operation: No noisy combustion or fans.
• Versatile Applications: Works with underfloor heating, radiators, and hot water tanks.
• Space-Saving: No bulky fuel tanks or storage needed.
• Safe and Clean: No flames, no carbon monoxide, no flues.

It’s a smart move for any modern home.

Debunking common myths about ASHPs

You might have heard a few things about air source heat pumps that aren’t quite true. Let’s clear them up.

“They don’t work in cold weather.”
Not true. Modern systems work efficiently even at -20°C. 

“They’re noisy.”
The latest units are designed for quiet operation—many are no louder than 45-60dB.

“They’re only for new builds.”
We install heat pumps in both new and old homes. A proper design makes all the difference.

“They cost too much.”
With grants and lower running costs, ASHPs are more affordable than you might think.

“They don’t heat water well.”
Integrated systems can provide all the hot water your household needs—efficiently and reliably to 60°c.

Are heat pumps the future of home heating?

Yes.

They’re clean, efficient, and scalable. They’re better for your home, your health, and the environment. And as the UK moves towards net zero, they’ll become the new standard.

At 21 Degrees, we believe homes should be built for the future—not just for today. That’s why we design every system with long-term performance in mind.

Reduce your carbon footprint today

Want to make a real difference?

An air source heat pump is one of the most impactful steps you can take to reduce your home’s emissions and energy use.

We’ll guide you through the process—from design and product selection to full installation and support.

Ready to make the switch? Contact 21 Degrees now to design and install your ideal air source heat pump system.