FAQs about Air Source Heat Pumps

Answers to frequently asked questions about Heat Pumps

Browse the list of FAQs below, and find the answers to your questions too.

Air source heat pumps extract heat energy from the air outside of your home and use it to heat up your radiators or underfloor heating system. They also heat your water.

Although they require electricity to work, they provide more heat energy than the electrical energy they consume.

An air source heat pump replaces your boiler. Your current boiler will probably run on oil, LPG, gas, electricity or pellets. The new heat pump connects into the same pipework as your old boiler, though some adjustments may need to be made.

Your home needs to be well insulated for an air source heat pump to work efficiently. As part of our service, we will carry out a full technical survey in order to establish if a heat pump makes sense for you. Sometimes additional works are required, such as replacing your main water cylinder, upgrading the pipework, or changing your radiators.

A rough, ball-park figure to supply and install a domestic air source heat pump is £10,000 to £14,000 inc. VAT. The cost can be lower for small systems and higher for large installations.

The government helps you mitigate this upfront cost via the Boiler Upgrade Scheme (BUS) which gives you £7,500 off, assuming you qualify.

The government provides grants to encourage property owners to install low carbon heating systems such as heat pumps, through the Boiler Upgrade Scheme (BUS).

These grants help property owners overcome the upfront cost of low carbon heating technologies.

The scheme is open to domestic and small, non-domestic properties in England and Wales. It runs from 2022 to 2025. Check to see if you are eligible.

A typical, single-unit air source heat pump takes about 3-5 days to install. The installation can take a little longer if additional works are required, such as a replacement water cylinder or radiators.

Most air source heat pumps are warrantied for 5-7 years. The warranties are often dependent on the heat pump being serviced once a year.

Well-maintained heat pumps should last at least 15-20 years or longer.

Heat pumps are quite robust and generally don’t need much maintenance. However, some heat pumps do require an annual service in order to keep the warranty valid.

It’s a good idea to have a professional heat pump engineer check your system either once a year or once every two years.

Yes they do! They can work down to about -20 °C. You may be wondering how that’s possible, as it might seem like below zero the air won’t have any energy in it.

The answer lies in the fact that the Celsius temperature scale is artificial. True temperature is measured in Kelvin (not Celsius) and the coldest possible temperature – containing no heat energy at all – is zero degrees Kelvin which is a mighty -273.15 °C!

No, Air Source Heat Pumps aren’t noisy. They generate around 40-60 decibels of noise which is comparable to a refrigerator or dishwasher.

We will inspect your radiators during our survey which will highlight any incompatibilities and a cost-effective solution will be offered. In most cases your existing radiators will be adequate, but in some cases we need to upgrade the output of the radiator.

Yes, some Air Source Heat Pumps reverse the flow of the refrigerant fluid to provide cooling as well as heating.


Call 0800 909 8882

for more information, visit our main Air Source Heat Pump page, or contact us online


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