How Much Does Air Conditioning Cost in the UK?
A single-room split system costs £1,500 to £3,000 fully fitted. Of that, the unit itself is usually £600 to £1,400 and the labour £700 to £1,200. Cooling 2 to 3 rooms with a multi-split costs £4,000 to £8,000, and a ducted whole-house system runs £8,000 to £15,000. London prices sit 15 to 25% above the national average.
Quick Answer
Air conditioning costs £1,500 to £3,000 fitted for a single room in the UK. A multi-split covering 2 to 3 rooms costs £4,000 to £8,000, and a ducted whole-house system £8,000 to £15,000. The unit is £600 to £1,400 of that; the rest is installation by an F-Gas certified engineer.
Typical installed prices, 2026. Exact quotes depend on your property.
Fact-checked by John Rooney, Solar Energy Editor. Editorial policy
What would yours cost?
Prices vary by home and installer. Compare free quotes from vetted local specialists to get your exact figure.
Get Free Quotes →Free, no obligation, takes 60 seconds
Air conditioning cost by system type
The biggest driver of price is how much of your home you want to cool. Each indoor unit adds cost, and ducted systems add building work on top.
| System | Coverage | Typical Cost Fitted | Install Time |
|---|---|---|---|
| Single split | 1 room | £1,500 to £3,000 | 1 day |
| Multi-split | 2 to 3 rooms | £4,000 to £8,000 | 2 to 3 days |
| Ducted | Whole house | £8,000 to £15,000 | 3+ days |
| Portable unit | 1 room (poorly) | £250 to £700, no install | None |
A wall-mounted split system is the standard choice for UK homes: one outdoor condenser, one indoor unit per room. Portable units are cheaper upfront but noisy, inefficient, and need a hose out of the window, which is why most people who cool a room regularly end up upgrading.
What you're actually paying for
| Item | Single Room | Notes |
|---|---|---|
| Indoor + outdoor unit | £600 to £1,400 | Brand and capacity dependent |
| Labour and commissioning | £700 to £1,200 | F-Gas certified engineer, about a day |
| Pipework, cabling, brackets | Usually included | Long pipe runs add cost |
Installation is skilled work: the engineer mounts both units, runs refrigerant pipework and cabling between them, pressure-tests the circuit, then commissions the system. UK law requires anyone handling refrigerant to hold F-Gas certification, so this is not a DIY job. See the full installation guide for the process step by step.
Skip the guesswork
The ranges above are national averages. Competing quotes from local installers give you your real price.
Compare Free Quotes →Running costs
A small bedroom split typically draws 500 to 800 watts while cooling, a fraction of what a portable unit uses for the same comfort. Modern split systems are heat pumps, delivering roughly 3 to 4 kilowatts of cooling or heating for every kilowatt of electricity. Run in heating mode in winter, the same unit is one of the cheapest ways to heat a single room, which is why many buyers treat it as a year-round purchase. More on that in our air-to-air heat pump guide.
What changes the price
Number of indoor units
Each extra room adds an indoor unit and pipework. A multi-split shares one outdoor condenser across up to 4 or 5 indoor units.
Pipe run length
The further the indoor unit sits from the outdoor condenser, the more pipework and labour. Ground-floor rooms with an outside wall are cheapest.
Unit brand and capacity
Premium brands like Daikin and Mitsubishi Electric cost more than value brands like Midea. Bigger rooms need higher-capacity units.
Where you live
London and the South East run 15 to 25% above the national average. Comparing more than one local quote matters most in expensive areas.
British Gas, Octopus and big-brand pricing
Searching for British Gas or Octopus air conditioning prices? Big energy brands don't publish fixed aircon price lists; they refer you to partner installers who quote per job. Octopus routes cooling enquiries to its Trusted Partners, independent companies that pay Octopus an introduction fee. Whoever the brand on the letterhead, the install is priced against the same market, so the ranges on this page still apply and comparing independent quotes is the reliable way to avoid overpaying.
Air Conditioning Cost FAQ
How much does it cost to install air conditioning in a UK home?
A single-room split system costs £1,500 to £3,000 fully fitted, including the unit (£600 to £1,400) and labour (£700 to £1,200). A multi-split covering 2 to 3 rooms costs £4,000 to £8,000, and a ducted whole-house system £8,000 to £15,000.
How much is an air conditioning unit on its own?
The indoor and outdoor units for a single-room split system cost £600 to £1,400 depending on brand and capacity. But the unit is only part of the price: installation by an F-Gas certified engineer adds £700 to £1,200, and UK law does not allow DIY refrigerant work.
Why is professional installation required?
Split systems contain fluorinated refrigerant gases, and UK law requires anyone installing, servicing or decommissioning them to hold F-Gas certification. Improperly handled refrigerant is both an environmental and safety issue, and an uncertified install voids most manufacturer warranties.
Is air conditioning expensive to run in the UK?
Less than most people expect. A small bedroom split draws 500 to 800 watts while cooling, and because UK homes only need cooling for part of the year, annual cooling costs are modest. Modern units are heat pumps that deliver 3 to 4 kW of output per kW of electricity, so running one for heating in winter is efficient too.
Is there a grant for air conditioning?
No. The £7,500 Boiler Upgrade Scheme covers air-to-water and ground source heat pumps that provide heating and hot water, and cooling-only units do not qualify. Be wary of any company advertising an air conditioning grant.
How much does British Gas or Octopus charge for air conditioning?
Neither publishes a fixed price list. Both route enquiries to partner installers who quote per job against the same market rates: £1,500 to £3,000 for a single room. Comparing independent local quotes alongside any big-brand referral is the reliable way to check you are paying a fair price.
Sources
Last updated: September 2026
John Rooney is the founder of Solar Info and has been covering the UK solar energy market since 2023. He researches every battery and inverter brand against manufacturer datasheets, MCS and Ofgem data, and feedback from the MCS-certified installers in our directory before publishing.
Get Your Exact Air Conditioning Price
Compare free quotes from vetted local installers. No obligation.
Get Free Quotes →