Air conditioning for one room in a UK home typically costs about £1,900 to install, and around £3,700 for a three-bed semi-detached house, according to the Energy Saving Trust. Ducted and whole-house systems cost more and are priced per project. In a home, a reversible system can qualify for 0% VAT until 31 March 2027, and some homes can get a £2,500 Boiler Upgrade Scheme grant.
Those are typical figures, not quotes. The real price depends on the system, the building and how much work it takes to get pipework and power from the indoor unit to the outdoor one. This guide explains what goes into the number so you can compare quotes properly, and if you want a firm figure for a Daikin system, our instant online quote gives one on screen.
Installation costs at a glance
| System | Typical use | Cost guide |
|---|---|---|
| Single wall-mounted split | One bedroom, home office or living room | About £1,900 (Energy Saving Trust) |
| Multi-split or several splits | A three-bed semi-detached home | Around £3,700 (Energy Saving Trust) |
| Concealed ducted system | Whole floors with only grilles visible | Priced per project, usually well above a wall split |
| Ceiling cassettes | Offices, shops and restaurants | Priced per project, plus VAT at 20% for most businesses |
| VRF system | Large houses and commercial buildings | Priced per project |
| Portable unit | Short-term or rented homes | An appliance, with no installation cost |
The Energy Saving Trust figures come from its guide to air-to-air heat pumps, which is what most home air conditioning is.
What an installation price should include
- A survey and sizing. A heat load assessment of the room, its glazing, orientation and use, so the unit is neither too small nor too big.
- The equipment. Indoor unit, outdoor unit, remote or app control, and wall or ground brackets for the outdoor unit.
- Refrigerant pipework between the units, insulated and routed neatly, with the length included stated in the quote.
- Condensate drainage from the indoor unit, by gravity where possible and with a pump where not.
- Electrical work. Usually a new dedicated circuit, which is notifiable work and must be done by a registered electrician or notified to building control.
- Commissioning and paperwork. Pressure testing, evacuation, charging, a test run, F gas records and handover.
If a quote does not mention one of these, ask whether it is included. The cheapest quote is often the one with something left out.
What pushes the price up
- Distance between the units. Longer pipe runs take more time, materials and sometimes additional refrigerant.
- Getting through the building. Thick solid walls, stone, steel or concrete, and runs through several rooms or floors.
- Where the outdoor unit goes. High-level wall positions, flat roofs, scaffolding or access equipment, and anything that needs acoustic screening to pass the noise rules.
- Condensate. A pump and a longer drain run when the indoor unit cannot drain by gravity.
- Electrics. An older consumer unit or no spare capacity can mean extra electrical work.
- Concealment. Ducted systems need ceiling voids, builders' work and making good, which is where much of their cost sits.
- Number of rooms. Each extra indoor unit adds equipment, pipework and labour, although a multi-split can share one outdoor unit.
- London sites. Access, parking, listed buildings and conservation areas all add time.
VAT, grants and allowances
- VAT in homes. Installing a heat pump in residential accommodation is zero-rated for VAT until 31 March 2027 under HMRC's energy-saving materials relief. HMRC says that most air conditioning units are air source heat pumps, although in cases of doubt it depends on the facts. From 1 April 2027 the relief reverts to the reduced rate.
- Grants. In England and Wales, the Boiler Upgrade Scheme offers £2,500 towards an eligible air-to-air heat pump in a home that is replacing fossil fuel or electric heating, installed by an MCS certified installer. Our guide to air-to-air heat pump grants covers who qualifies.
- Businesses. Commercial installations are normally charged VAT at 20%, and the cost can qualify for capital allowances. Our guide to capital allowances on air conditioning explains how.
The cost after installation
The installation price is only part of the bill. A more efficient unit costs more to buy but less to run every year, and a reversible system can heat a room far more cheaply than a plug-in heater. Our guide to air conditioning running costs shows how to read the energy label and work out the yearly cost at the current price cap.
Servicing matters too. Manufacturers' warranties commonly depend on regular maintenance, so ask what servicing the warranty requires before you choose a system.
How to compare air conditioning quotes
- Exact models. Indoor and outdoor model numbers, so you can check the SEER, SCOP and noise figures on the data sheet.
- Refrigerant. New single splits must use a gas with a GWP below 750, which in practice usually means R32.
- Pipework. The length included, the route and how it will be finished inside and out.
- Drainage and electrics. Whether a condensate pump and a new circuit are included.
- Planning. For a home in England, whether the position meets permitted development and passes the MCS 020 a) noise calculation. Our guide to planning permission for air conditioning has the detail.
- Warranty and servicing. How long, from whom, and what you have to do to keep it.
- Qualifications. F gas certification for the engineers and the company.
Questions people ask about air conditioning installation costs
How much does it cost to install air conditioning in the UK?
The Energy Saving Trust puts typical home air conditioning, which is an air-to-air heat pump, at about £1,900 for one room and around £3,700 for a three-bed semi-detached house. Ducted, whole-house and commercial systems are priced per project and usually cost more.
How much does it cost to install air conditioning in one room?
About £1,900 is the Energy Saving Trust's typical figure for one room. Long pipe runs, a high-level outdoor unit, a condensate pump or extra electrical work push it up, so get a quote based on the actual room.
Is there VAT on air conditioning installation?
In homes, installing a heat pump is zero-rated until 31 March 2027, and HMRC's view is that most air conditioning units are air source heat pumps, although it depends on the product. Businesses are normally charged VAT at 20%.
Can I get a grant for air conditioning?
Possibly. Homes in England and Wales can claim £2,500 through the Boiler Upgrade Scheme if the air-to-air heat pump replaces fossil fuel or electric heating and an MCS certified installer fits it. Cooling-only units and non-residential buildings do not qualify.
How long does air conditioning installation take?
A single wall-mounted split is usually a day's work once the site is ready, while multi-splits and ducted systems take longer. Our guide to how long air conditioning installation takes goes through each system type.
Is a portable air conditioner cheaper than installing a split system?
Up front, yes, because a portable needs no installation. It costs more to run, is noisier and cools less effectively. Our comparison of split and portable air conditioning sets out the trade-offs.
Getting a real price
For a Daikin system in your home, our instant quote gives a price on screen based on your rooms. For anything more involved, such as several rooms, ducted systems or business premises, see our home air conditioning installation and commercial installation pages.
Last updated: 4 November 2026
Written by
Ali Elm
Ali is the Head of Operations at Be Cool Refrigeration with over a decade of hands-on experience in HVAC and commercial refrigeration. He oversees every installation, repair, and maintenance project, making sure the work meets the highest standards. Ali holds full F-Gas certification and has worked across residential, commercial, and industrial refrigeration systems throughout London and the South East. When he is not on site, he writes these guides to help business owners and homeowners understand their cooling systems better.