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7 Step-Guide to Air Source Heat Pump Installation (June 2025)
- A heat pump takes about 2–5 days to install on average, depending on the complexity of the installation.
- An air source heat pump installation will cost anywhere between £4,000 and £15,000.
- To find a qualified installer in the UK, use trusted directories like the Microgeneration Certification Scheme or check if the installer is listed with the TrustMark scheme.
A badly installed air source heat pump can cost you thousands in lost savings, repairs, and higher energy bills. Done right, it can transform your home’s efficiency for years to come.
Looking to reap the benefits of an air source heat pump installation but have no clue where to start? You’ve come to the right place. You might know how a heat pump works to heat your home and reduce carbon emissions, but what is the installation process?Â
In this air source heat pump installation guide, we’ll give you a full rundown so you can know exactly what to expect.
Finding and comparing multiple heat pump installers on your own can be time-consuming and overwhelming. With our help, you can skip the hassle. Just fill in our 30-second form, and we’ll connect you with up to 4 local air source heat pump installers.Â
You’ll be able to compare quotes easily and secure the best deal for your installation. All quotes are free and come with no obligation.
Simply click below to get started now!
- Quotes from local engineers
- Payment by finance available
- Save £7,500 with BUS grant
- The process of installing an air source heat pump
- Air source heat pump installation diagram
- How long does it take to install a heat pump?
- Air source heat pump installation requirements
- How much does an air source heat pump installation cost?
- Can you DIY air source heat pump installation?
- What to know before installing an air source heat pump
- How to choose the right air source heat pump installer
- FAQ
The process of installing an air source heat pump
The process of installing a heat pump system can be broken down into the following steps:
- Choosing the right installer: You should carefully consider which installer you will work with. It’s good to compare several professionals before committing to one.Â
- Onsite inspections: The installer will conduct an inspection of your home to ensure that it’s suitable for your chosen heat pump installation.Â
- Removing existing heating system: Before installing the air source heat pump, the installer will remove your old heating system. They are trained to safely remove systems, such as gas boilers, and dispose of them for you.
- Indoor and outdoor units installation: The outdoor unit is installed in a spot with good airflow and minimal obstructions, usually on a flat surface near the property. At the same stage, the indoor units are fitted in the appropriate locations based on the type of system and your home’s layout.
- Connection of units to heat distributors: Whether you’re installing an air to air or an air to water heat pump, the indoor units need to be connected to distribute heat. This could involve linking the system to vents (for air to air) or connecting it to existing radiators or underfloor heating (for air to water).
- Remaining wiring and connections completion: Depending on the distance between the indoor and outdoor units, the installer may drill through a wall to run refrigerant lines and electrical wiring. These connections ensure the system operates safely and efficiently.
- Final checks: The installer will ensure that the air source heat pump functions correctly and is ready for use.
Air source heat pump installation diagram
This diagram gives you a clear picture of how the system works in a typical UK home. The outdoor unit, which sits outside your house, pulls in heat from the air even when it’s cold outside. That heat is transferred into your home using refrigerant lines, and depending on the type of system you choose, it’s delivered in one of two ways:
- If you choose an air to water heat pump, the system heats water instead. That water then flows through your radiators or underfloor heating, and for that, a hot water tank is usually installed indoors to store the heated water.
- If you go for an air to air heat pump, warm air is blown into your rooms through a wall mounted indoor unit with a fan.
How much inconvenience does heat pump installation create?
Installing an air source heat pump is not overly disruptive, but it does come with a few practical considerations you should be aware of. Here’s what to expect during the process:
- Outdoor access is essential: The installer will need to fit the outdoor unit in a spot with good airflow, usually at ground level. They’ll also drill through the external wall to run the necessary pipework inside. If access is tight, clearing the path beforehand helps avoid delays.
- Some indoor disruption is likely: Depending on the type of heat pump, the installer may need to lift floorboards, run cables, and install either a fan unit (air to air) or pipework for radiators or underfloor heating (air to water).Â
- Heating and hot water may be temporarily unavailable: If replacing an existing boiler, you should expect one to two days without heating or hot water. Planning ahead with alternatives like portable heaters or an immersion switch is recommended.
- Installation takes 2 to 5 days on average: The timeframe depends on system complexity and the condition of existing pipework or electrics. A straightforward replacement is quicker than a full system fit in a house with no prior infrastructure.
- Noise and foot traffic are part of the job: Expect drilling, tool noise, and movement of installers through the home during working hours. It's helpful to keep pets or children away from the active work zones for safety and peace of mind.
- Some minor redecoration may be needed afterward: After pipework and cables are installed, small touch-ups like repainting or patching may be required around areas that were opened up.
Is there maintenance needed post-installation?
Yes, there is some maintenance involved after a heat pump installation. Fortunately, it won’t need too much attention. The heat pump maintenance includes:
- Annual servicing: A qualified technician should check the system once a year to ensure it’s running efficiently and safely. This includes checking refrigerant levels, cleaning filters, inspecting electrical connections, and verifying system pressure.
- Basic upkeep: Includes such clearing leaves and debris from around the outdoor unit and cleaning or replacing indoor filters every few months. This does not require a professional and can be done by homeowners.
Servicing costs range from £150 to £250 per year, depending on the installer and your location. Some companies offer maintenance plans that bundle servicing with extended warranties or call-out cover.Â
By doing proper maintenance, you avoid any additional repair costs and can maintain the 25-year lifespan of your air source heat pump.
A well-maintained air source heat pump typically pays back its installation cost in 6 to 12 years, depending on factors like energy prices, system efficiency, and available grants. After that, you continue to benefit from significantly lower heating bills for the remainder of its lifespan.
How long does it take to install a heat pump?
On average, an air source heat pump installation takes 2 to 5 days to complete. The exact duration depends on the type of home, the existing heating system, and whether additional work (like upgrading radiators or installing a hot water tank) is required.
In comparison, a gas boiler replacement is generally quicker (around 1 to 3 days), because it usually connects to existing infrastructure.
Here’s a breakdown of typical installation times based on different home types:
| Home type | Estimated installation time |
|---|---|
| 1-bedroom flat | 1–2 days |
| 2-bedroom flat | 2–3 days |
| 2-bedroom terraced house | 2–4 days |
| 3-bedroom semi-detached house | 3–5 days |
| 3-bedroom end-of-terrace house | 3–4 days |
| 4-bedroom detached house | 4–5 days |
| Bungalow with underfloor heating | 2–3 days |
| Large rural property | 5+ days |
Air source heat pump installation requirements
To install an air source heat pump properly, you must meet some technical and legal requirements. These ensure the system runs efficiently, complies with regulations, and qualifies for any available incentives.
Here’s what you should know before installing a heat pump:
- Outdoor space: Install the outdoor unit on a flat and stable surface with at least 1 metre of clearance around it. Avoid placing it too close to windows or neighbouring properties.
- Insulation: Make sure your home is well insulated before installation. Use at least 270 millimetres of loft insulation, fill any cavity walls, and seal draughts around windows and doors.
- Indoor space: Reserve space for a hot water tank if you’re installing an air to water system. Fit it in an airing cupboard, loft, or utility room.
- Electrical connection: Hire a qualified electrician to connect the heat pump to your main electricity supply.Â
- Planning permission: Check if you need planning permission before starting. Most homes don’t, but you will require it if your property is listed, in a conservation area, or if you plan to install the unit on a flat roof.
- Certified installer: Choose an installer certified by the Microgeneration Certification Scheme (MCS) or TrustMark scheme. This ensures quality and lets you apply for the Boiler Upgrade Scheme grant.
- Building regulations compliance: Ask your installer to register the installation with your local authority. They should also give you a building regulations certificate and explain how to operate and maintain the system.
It might feel like a lot to think about, especially if this is your first big home upgrade. But don’t worry, a certified installer will guide you through the entire process. They’ll check if your home is suitable, explain what needs adjusting, and handle the technical bits like permissions and paperwork.
How much does an air source heat pump installation cost?
The cost of installing an air source heat pump ranges from £4,000 to £15,000, with the average cost falling between £7,000 and £10,000. The final cost will depend on the air source heat pump size, its type, and the complexity of the installation.
We’ve outlined the expected air source heat pump costs for you to compare in the table below.
| Heat pump type | Supply cost | Cost inc. installation | Average cost inc. installation |
|---|---|---|---|
| Air to air | £3,850 – £9,200 | £4,000 – £9,500 | £6,600 |
| Air to water | £8,650 – £13,300 | £9,000 – £15,000 | £11,000 |
Considering the price, you may wonder: Are air source heat pumps worth it? The quick answer is yes!
As you can see, installing a heat pump can be expensive. While a heat pump installation can cost up to £15,000, a new gas boiler typically costs £2,000 to £4,000, and an oil boiler around £3,000 to £5,000.
Thankfully, there are some ways to lessen the financial burden. For instance, if you live in England or Wales, you can apply for an air source heat pump grant, such as the Boiler Upgrade Scheme, and receive £7,500 toward your installation. That means if your total installation cost is £10,000, you could pay as little as £2,500 out of pocket.
Different schemes are available in Scotland and Northern Ireland as well.
However, many of these grants can be regionally dependent, so it's best to understand your area. We have resources dedicated to heat pumps in Wales, heat pumps in Scotland and heat pumps in Northern Ireland to help.
One of the best ways to avoid overspending on your air source heat pump installation is to compare quotes from local installers. It can be a daunting task tracking down professionals though, taking hours of your time to source quotes — but there is a much easier approach!Â
By filling in our 30-second form, you can get up to 4 free quotes from heat pump installers near you.Â
Click below to request free, non-binding quotes today!
- Quotes from local engineers
- Payment by finance available
- Save £7,500 with BUS grant
Can you DIY air source heat pump installation?
No, it’s not advisable to install an air source heat pump on your own if you lack the proper qualifications. Not only do you risk injury or damage to your heat pump, but removing your old heating system safely is extremely important and something that should not be done alone.Â
In addition, if you do the air source heat pump installation yourself, you might face some financial repercussions. For instance, the warranty for your appliance may not cover any damage that occurs without a professional installation. You might also be ineligible for certain heat pump grants if the installation is not carried out by an expert.
By working with a certified installer, you can answer any questions you may have, such as "What heat pump size do I need?" or "Are heat pumps noisy?" before starting the installation process.
Additionally, you avoid any potential issues and ensure that your air source heat pump installation is carried out safely and to the highest quality standards. So, if you were wondering how to install an air source heat pump, the answer is: with the help of a professional heat pump installer.
What to know before installing an air source heat pump
Before installing an air source heat pump, it’s important to understand what you're signing up for. Let’s start with the money.Â
Yes, heat pumps can be expensive upfront. Installation typically ranges from £4,000 to £15,000, with most homeowners in the UK paying somewhere between £7,000 and £10,000. That’s more than a standard boiler, but you may be able to claim a £7,500 grant through the Boiler Upgrade Scheme, which takes a big chunk off the total.Â
If you’re switching from oil, LPG, or electric heating, you could also see annual savings of up to £1,200 on your energy bills, so the system usually pays off over time.
To apply for the grant, you’ll need to use an MCS-certified installer. They’ll also confirm whether your home meets the criteria.Â
Keep in mind, not every house is a perfect match for a heat pump. To get the best results, your home should be properly insulated. You’ll also need space outside for the unit and room indoors for a hot water cylinder if you're installing an air to water system.
How to choose the right air source heat pump installer
The best way to find the right installer for the job is to compare several installers and check their qualifications, customer reviews, and service costs. Finding all this crucial information on your own can be a tedious chore involving hours of research.
So, why not let us help you avoid wasting your precious time and energy? We work with a broad network of reputable specialists and can put you in touch with them in no time. Just fill in our 30-second form to request air source heat pump quotes, and we’ll connect you with up to 4 local installers.Â
Then, all that’s left is to choose the installer that meets all your requirements and compare prices so that you can secure the best deal for your home.
Simply click below to request free, no-obligation quotes today!Â
- Quotes from local engineers
- Payment by finance available
- Save £7,500 with BUS grant
FAQ
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- 7 Step-Guide to Air Source Heat Pump Installation (June 2025)
- The process of installing an air source heat pump
- Air source heat pump installation diagram
- How long does it take to install a heat pump?
- Air source heat pump installation requirements
- How much does an air source heat pump installation cost?
- Can you DIY air source heat pump installation?
- What to know before installing an air source heat pump
- How to choose the right air source heat pump installer
- FAQ
- Quotes from local engineers
- Payment by finance available
- Save £7,500 with BUS grant