That makes it a practical fit for homes and spaces without a wet heating system: flats on storage or panel heaters, extensions and garden rooms, open-plan living areas, and homes where installing radiators and pipework would be very disruptive. One outdoor unit can serve a single indoor unit, or several rooms through a multi-split system, with each room controlled separately.
Flats in the Highlands and Islands on storage or panel heaters can often switch to air-to-air without fitting radiators or pipework. Top-floor rooms in the Highlands and Islands that overheat in summer gain from the cooling an air-to-air system provides. A survey in the Highlands and Islands covers indoor unit positions, pipe routes and hot water for homes across the Highlands and Islands.
Who it suits
- Extensions, conservatories and garden rooms
- Flats and apartments with storage or panel heaters
- Homes where fitting radiators and pipework would be very disruptive
- Households that already have, or will add, a separate source of hot water
Grants and rules for heat pumps in Scotland
The Boiler Upgrade Scheme does not apply in Scotland. Instead, homeowners in the Highlands and Islands can apply to Home Energy Scotland for a grant of up to £7,500 towards a heat pump, with up to £1,500 more for eligible rural and island homes, plus an optional interest-free loan of up to £7,500. You need a written funding offer before any work starts.
Installing heat pumps is zero-rated for VAT across the UK until 31 March 2027. Scotland has its own permitted development rules for air source heat pumps and its own building standards, so we confirm what applies to your property at survey.
Air-to-air heat pumps prices in the Highlands and Islands
These are guide prices for the Highlands and Islands, installed and including VAT. Your final price is fixed in a written quote after the survey and depends on the heat loss of the house, the radiators that need changing and where the unit goes.
| System | Installed guide price |
|---|---|
| Air-to-air heat pump, 1–2 rooms | £2,700–£5,600 |
| Air-to-air heat pump, multi-room 3–4 bedroom home | £4,500–£8,950 |
Installed, inc VAT. Air-to-air systems heat (and can cool) rooms but do not provide hot water.
Towns we cover in the Highlands and Islands
We cover 12 towns in the Highlands and Islands for air-to-air heat pumps. Each links to local guide prices and the grant position for Scotland.
| Town | Postcode district | Nearest town | Midwinter daylight |
|---|---|---|---|
| Inverness | IV1 | Dingwall | 6 h 35 min |
| Fort William | PH33 | Oban | 6 h 45 min |
| Aviemore | PH22 | Inverness | 6 h 40 min |
| Dingwall | IV15 | Inverness | 6 h 34 min |
| Kirkwall | KW15 | – | 6 h 11 min |
| Lerwick | ZE1 | – | 5 h 49 min |
| Nairn | IV12 | Forres | 6 h 34 min |
| Portree | IV51 | – | 6 h 36 min |
| Stornoway | HS1 | – | 6 h 24 min |
| Thurso | KW14 | Wick | 6 h 17 min |
| Ullapool | IV26 | Dingwall | 6 h 29 min |
| Wick | KW1 | Thurso | 6 h 20 min |
Air-to-air heat pumps questions
Is there a grant for air-to-air heat pumps?
In England and Wales, yes: the Boiler Upgrade Scheme includes a grant of £2,500 for air-to-air heat pumps in homes, from 28 April 2026. The MCS-certified installer applies to Ofgem and deducts it from your quote, subject to the scheme's conditions. The scheme does not cover Scotland or Northern Ireland; in Scotland, Home Energy Scotland has its own rules.
How much sound do the indoor units make?
Indoor units are designed to run quietly, with a fan you will hear most when heating or cooling at full output. Lower fan settings and night modes reduce sound in bedrooms. Siting matters for the outdoor unit too: it needs airflow and a position that passes the MCS noise assessment. Ask to see the sound levels of the proposed units at survey.
Are air-to-air heat pumps suitable for flats?
Often, yes. They need no radiators, pipework or cylinder, so they suit flats heated by storage or panel heaters. You need a position for the outdoor unit, such as a balcony, wall bracket or ground-floor yard, and leaseholders normally need the freeholder's or management company's consent. Planning rules for flats differ by nation, so we check what applies at survey.
Can air-to-air heat pumps cool as well as heat?
Yes. Most air-to-air systems can reverse their cycle to cool and dehumidify rooms in summer, which makes them useful for loft rooms, south-facing extensions and home offices that overheat. Cooling uses electricity, so running costs rise if it is used heavily. You control heating and cooling for each room separately.