Why air source is the usual choice
Across the three council areas, 19,096 households relied on oil or LPG alone in 2021 and 23,245 on electricity alone. For most of them an air source heat pump is the simplest replacement: no digging, a modest outdoor unit, and a system that works with the existing radiator pipework. Ground source is worth pricing where there is land, but air source is where most rural projects start.
Sizing a larger or older house
Rural Cheshire has more big, older houses than most of England: 36.6% of Cheshire East households and 30.6% in Cheshire West and Chester lived in detached houses in 2021. Bigger and older usually means more heat lost on a cold day, so the heat pump has to be larger. That is a sizing question, not a reason to rule the house out. The design starts with a room-by-room heat-loss calculation and picks a heat pump that meets it at the coldest outdoor temperature the design assumes.
Two things make the result smaller and cheaper to run: simple insulation, such as topping up the loft and draught-proofing doors and windows, and radiators sized so the system can run at a lower water temperature. Neither has to be perfect before a heat pump goes in.
Where the outdoor unit goes
A rural plot usually offers several spots. The best is close to the house, so the pipe run is short, with space around the unit for air to flow, and away from bedroom windows, yours and any neighbour's. In England an air source heat pump on a house can be permitted development under Class G if it meets the conditions, including the MCS 020 a) sound calculation and a limit of one unit on a semi-detached or terraced house or two on a detached house. See planning rules.
Inside: cylinder and radiators
- Hot water cylinder. Most heat pump systems need one; many oil systems already have a cylinder, but it may need replacing with one designed for a heat pump.
- Radiators. The design shows which rooms need larger radiators to stay warm at the lower water temperature. Old solid walls and high ceilings often need more emitter area.
- Controls. Weather compensation sets the water temperature from the outdoor temperature, which keeps the system efficient on the many mild days.
Through a Cheshire winter
An air source heat pump keeps collecting heat below freezing, but its output and efficiency fall as the air gets colder, and in cold, damp weather it briefly defrosts its outdoor coil. A design sized for the cold end of the year handles that. Run it steadily rather than switching it off and on, and keep the unit clear of leaves and snow.
Grants
An owner replacing oil, LPG, electric or solid-fuel heating can use the Boiler Upgrade Scheme, £7,500 off the quote, or £9,000 for an oil or LPG home with no mains gas until 31 March 2027. Lower-income households may be eligible for the consortium's Warm Homes: Local Grant instead. The route finder shows which fit.
The census heating page shows how many homes in each area are in the same position.