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What are they?

An air source pump is an alternative way to heat your home. It will enable you to generate your own renewable heat and potentially save money on your energy bills.

Heat Pumps:

  • are energy efficient
  • are sustainable
  • provide energy security
  • require little maintenance

How it works

An air source heat pump, sometimes referred to as an air-to-water source heat pump, uses a compressor to transfer heat from the outside air to water.

This water is then used to heat your rooms via radiators or underfloor heating.

The water can also be stored in a hot water cylinder for use in taps, showers and baths.

Air source heat pumps, which look like an air conditioning unit, need to be installed outside a property and work even if the temperature is well below zero.

Raven Renewables are accredited installers of air source heat pumps.

We work with housing associations, local authorities, non-profit organisations, institutional investors, developers, contractors, private landlords and individual homeowners.

How heat pumps work best

Heat pumps, which can substantially help to drive down energy bills and cut carbon emissions, work best when installed in a well-insulated property, as part of a ‘fabric first’ approach.

Once a home has been upgraded, heat pumps can be designed to work at temperatures as low as 35c, enabling efficiencies of up to 400%. It is recommended they are installed alongside the government’s ‘Boiler Upgrade Scheme’ which helps existing small domestic buildings transition to low carbon heating systems.

The best approach to air source heat pump installation depends on the individual property and a tailored solution should be developed for maximum energy saving results.

Contact us to find out more about our offering and how we can help you develop and deliver your net zero strategy by sending us an email at

Considerations when installing air-source heat pumps:

Your property location and its average air or ground temperatures throughout the year affect heat pump efficiency.

Air source heat pumps are considered ‘permitted developments’ and often don’t require planning permission.

However, exceptions apply and it’s best to ask your local planning office for guidance. If you live in a listed building, conservation area or national park, additional restrictions may apply.

Global demand is disrupting availability. We have partnered with three of the top heat pump suppliers in Samsung, Mitsubishi and Daikin to ensure that we have resilient supply chains.

EHS Smart Heating Approved logo
Mitsubishi Electric logo  Daikin D1 Approved Installer logo


Air source heat pumps work best when the property is well insulated. Improving the insulation of your home makes it more comfortable and reduces your heating loses and costs.

For people using gas boilers, heat pumps are likely to be slightly more expensive to run unless maximum efficiency is ensured by using the best radiator/underfloor heating design. Otherwise the heat the pump is generating escapes more easily.

The long term benefits are better when replacing the boilers with heat pumps as heat pumps can save you more on your heating bills and the carbon emissions are reduced.

Air source heat pumps require a well-qualified installer, are low maintenance and are made to last for years.

However, regular servicing by a specialist can identify any problems, saving you money on repair and maintenance costs. Scheduled maintenance will ensure heat pumps are performing effectively

Raven Renewables is an end-to-end service. Except form design and installation, we are offering service and maintenance to ensure that the renewable energy installed is running properly and effectively with high standards.

Boiler Upgrade Scheme (BUS): Supports the decarbonisation of heat in buildings. Provides upfront capital grants to support the installation of heat pumps and biomass boilers in homes and non-domestic buildings in England and Wales.

Acting on behalf of property owners, installers can apply for:

  • £5000 off the cost and installation of an air source heat pump
  • £5000 off the cost and installation of a biomass boiler
  • £6000 off the cost and installation of a ground source heat pump, including water source heat pumps.

£450 million of grant funding is available over three years from 2022 to 2025.

Home Upgrade Grant (HUG): Local authorities can access grant to support low income households by upgrading the energy efficiency of properties off the gas network in England.

Local Authority Delivery scheme (LAD): aims to raise the energy efficiency of low income and low energy performance homes with a focus on energy performance certificate (EPC) ratings of E, F or G.

Energy Company Obligation (ECO): A government energy efficiency scheme in Great Britain to tackle fuel poverty and help reduce carbon emissions. Under ECO, medium and larger energy suppliers fund the installation of energy efficiency measures in households.

Contact us to find out more about the financial incentives available for your property. Email

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