Cost guide

Air to air heat pumps cost UK

Energy Saving Trust says a typical air to air heat pump can cost about £1,900 for one room and around £3,700 for a three-bed semi-detached home. The real installed price still moves with indoor units, electrical work, route length, and access.

If the job is eligible and properly applied for on or after 28 April 2026, the new BUS route is due to offer a £2,500 grant. That changes the net price, not the survey work needed to quote it cleanly. · 4 min read

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Current benchmarks

Typical air to air heat pumps cost in the UK

Single room

Energy Saving Trust says a system to heat one room typically costs about £1,900. That is a useful benchmark for a simpler split-system job, not a universal quote.

Three-bed semi

The same guide gives around £3,700 for a three-bedroom semi-detached home. That reflects a broader domestic system with more than one indoor unit and a bigger install scope.

What is included

These are public market benchmarks, not a fixed national tariff. Redecoration, awkward access, added electrical work, or hot-water changes can all move the real number.

Source checked on 18 April 2026: Energy Saving Trust air-to-air heat pumps. The cost figures above are taken from that guide.

Price drivers

What usually changes the final installed price

Indoor units

The number of rooms being covered matters fast. More indoor units, longer refrigerant runs, and more wall penetrations usually move the quote more than the headline outdoor unit does.

Electrical work

Consumer-unit context, isolators, cable routes, and practical installation constraints can add real cost. This is one of the biggest reasons a quick verbal price often ends up wrong.

Access and making-good

Awkward unit positions, condensate routes, scaffold needs, and redecoration can all change the final installed price. That is why a usable site record matters before anyone treats the benchmark as a firm quote.

Grant effect

What the £2,500 grant actually changes

Current position

Ofgem’s March 2026 property-owner guidance says eligible air-to-air applications properly made on or after 28 April 2026 are expected to be able to use a £2,500 grant route.

What it does

The grant changes the net installed price for eligible jobs. It does not change the need to confirm indoor unit locations, noise-sensitive siting, route lengths, and electrical reality before the quote goes out.

Best practical use

Treat the grant as a real current benchmark, then price the actual job from the site conditions. That is the difference between a marketing number and a quote that survives the survey.

Sources checked on 18 April 2026: Ofgem BUS property-owner guidance and Energy Saving Trust air-to-air heat pumps. The pricing interpretation above is an inference from those public benchmarks plus normal installation variables.

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