How Do Air Source Heat Pumps Work?

As homeowners increasingly seek sustainable and energy-efficient solutions, air source heat pumps have become an attractive option for reducing energy consumption and lowering heating costs. But what exactly are air source heat pumps, and how do they work?

In this guide, we’ll explain the science behind air source heat pumps, highlight their key benefits, and explore whether they might be the right renewable heating option for your home in Colchester, Essex.

What is an Air Source Heat Pump?

Air source heat pumps (ASHPs) are a renewable alternative to traditional heating systems powered by fossil fuels. Instead of burning gas or oil to generate heat, ASHPs draw heat from the outside air—even in colder conditions—and convert it to warm your home via radiators, underfloor heating, or water systems.

While air source heat pumps require electricity to operate, they are extremely efficient. For every unit of electricity used, an ASHP can generate three to four units of heat, making them a cost-effective solution for modern homes.

In essence, air source heat pumps:

  • Harness renewable energy from the air, reducing reliance on non-renewable heating systems;
  • Can operate effectively in most climates, including colder areas like Essex winters;
  • Are energy-efficient and environmentally friendly; and
  • Include simple maintenance while offering long-lasting performance.

How Do Air Source Heat Pumps Work?

Air source heat pumps work by employing a refrigeration cycle to capture, compress, and transfer heat from outside air into your home. Here’s a breakdown of the process:

  1. Air Intake
    The external unit sucks in outside air, even when temperatures are low.
  2. Heat Absorption
    The system’s refrigerant absorbs the heat contained within the incoming air.
  3. Compression
    The refrigerant is compressed, increasing its temperature significantly.
  4. Heat Distribution
    Once sufficiently heated, the energy is transferred into your central heating system to warm your home or provide hot water.
  5. Cycle Repeat
    The refrigerant cools down, and the process starts again.

This clever, cyclical process enables ASHPs to reliably deliver heat throughout the year—even in winter months when temperatures drop below freezing.

Benefits of Air Source Heat Pumps

Interested in making the switch to air source heat pumps? Here are their standout benefits:

Energy Efficiency
Air source heat pumps offer excellent energy efficiency, providing up to four times more heat than the energy they consume. This makes them significantly greener and less costly than traditional boilers.

Reduced Energy Bills
Although the upfront cost of installation can vary, homeowners typically save on energy bills over time due to the reduced running costs of ASHPs, especially when paired with good home insulation.

Environmentally Friendly
Replacing a gas or oil boiler with an air source heat pump drastically reduces your carbon footprint. With the UK’s focus on cutting emissions, this is an excellent step toward sustainable living.

Durable & Low Maintenance
Designed for long-term reliability, ASHPs maintain excellent performance even in cold weather conditions. Routine servicing—typically once a year—is all that’s required for optimal efficiency.

Government Support
The UK Government’s Boiler Upgrade Scheme (BUS) can provide eligible homeowners with up to £7,500 toward installation. This incentive has helped many households in Essex make the transition to renewable technology.

Is an Air Source Heat Pump Right for Your Home?

Before installing an air source heat pump, it’s wise to assess whether it’s suitable for your specific property:

  • Outdoor Space: You’ll need sufficient room for the external unit, such as a garden or driveway with good airflow.
  • Insulation: Homes with poor insulation may struggle to benefit fully, so upgrades like draught-proofing may be necessary first.
  • Budget: While installation costs can be high, government subsidies and long-term savings make them a worthwhile investment for many homeowners.
  • Heating Needs: If your home requires high-temperature heating, consider a hybrid system combining ASHPs with a boiler for extra efficiency.

Partner With AJS Energy in Colchester


At AJS Energy, we’re committed to helping Essex homeowners embrace renewable energy solutions. If you’re considering installing an air source heat pump, our experienced team can guide you through the process—from assessing your property to providing expert installation service.

Take control of your energy future and reduce your carbon footprint today! Contact AJS Energy to learn more or to book an installation.

Get in touch with us now and make the switch to sustainable heating with AJS Energy!

Our Areas of Expertise

Our team of qualified engineers can provide a range of gas and oil services, as well as the installation and maintenance of renewable energy technologies.

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Air Source Heat Pumps

• Installation
• Maintenance & repair

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Gas & Oil Heating Systems

• New boiler installations
• Repairs to existing systems
• Maintenance and servicing
• Landlord gas safety checks

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Underfloor Heating

• Water-based systems
• Installations
• Maintenance and repair

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Renewable Energy Technologies

• Solar photovoltaic (PV)
• Battery storage
• EV charging

DON'T JUST TAKE OUR WORD FOR IT...

Here are some great customer testimonials

Ms Smead
Ms Smead
31st October 2024

I've used AJS for the last 3 years and highly recommend the company.  They provide a great service at a very reasonable price. Thank you Mark and Carole, it's a relief to find a plumber I can trust. 

Mr Trimnell
Mr Trimnell
10th December 2024

Excellent service from Mark, as always.

Mrs Shepard
Mrs Shepard
5th November 2024

Just to say thank you for the great service you provide and at a great price. Nothing is too much trouble. Thank you once again. 

Mrs Van Holby
Mrs Van Holby
10th October 2024

AJS installed and have serviced my boiler for more than five years. As a company they are professional, reliable and competent. As individual members of staff they are polite, friendly and helpful. I would not go elsewhere.

Mrs Tilbury
Mrs Tilbury
2nd October 2024

My new Vaillant boiler was installed this week by AJS Gas and Heating Services Ltd and I found it to be an extremely easy process. The workmen who came were very pleasant and polite and carried out the work seamlessly from beginning to end with very little mess. I have a lovely new boiler which works much more efficiently than my old one did.

John Barrett
John Barrett
4th June 2024

Always great service and fair and a honest price. They always call if there is a problem with appointments. Always leave a good clean job.

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Having this specialist team of customer advisors means we can respond to your queries quickly, so you can get the help you need fast.

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