Our complete Guide to Air Source Heat Pumps
Air source heat pumps are a sustainable alternative to conventional gas, electric or oil boilers, extracting heat from the outside air to warm your home and hot water even in cold weather. This guide walks through how they work, their benefits, what they cost, and the different types available so you can decide if one is right for your home.
What Is an Air Source Heat Pump?
An air source heat pump is a sustainable alternative to conventional heating systems like gas, electric or oil boilers. It extracts sufficient heat from the outside air to efficiently provide heating and hot water, even during cold weather. The system is built around three main components: an outdoor unit with a fan that draws in surrounding air, an indoor unit, and a refrigerant that circulates between the two.
How Do They Work?
These systems extract heat from the outside air via refrigerant, compress it to a higher temperature, and transfer it to your home's heating system — working much like a refrigerator in reverse. The extracted heat is then distributed through radiators, underfloor heating and hot water storage tanks, giving homeowners flexibility in how they choose to distribute their heat.
What Are the Benefits?
Air source heat pumps are highly energy efficient, often delivering more energy than the electricity they consume — sometimes up to 500% efficient. Because they run on renewable energy, they lower your carbon footprint and reduce reliance on fossil fuels, while delivering long-term savings on energy bills. Installations may also be eligible for grants: the government's Boiler Upgrade Scheme offers a grant of £7,500 towards air source heat pump installations.
How Much Do They Cost?
Installation costs range from £2,400 up to £15,000, including installation, depending on the system and the requirements of your home.
Are There Different Types?
There are three main types. Air-to-water systems transfer heat to water-based heating and are ideal for underfloor heating or large radiators. Air-to-air systems use warm air directly and can provide cooling in summer. Hybrid systems combine a traditional boiler with a heat pump, automatically switching between the two for optimal efficiency.
Key Takeaways
Air source heat pumps extract heat from the outside air to provide heating and hot water even in cold weather, using a refrigerant system that works like a refrigerator in reverse. They offer energy efficiency, a lower carbon footprint, bill savings and access to government grants, with installation costs ranging from £2,400 to £15,000 and three system types to suit different homes.
