How much does air conditioning cost to install in the UK?
Air conditioning installation costs in the UK vary widely depending on the type of system, the number of units and how much pipework is involved. As a general guide, a single wall-mounted split system for one room typically costs between £1,500 and £3,000 fully installed. Multi-room and commercial systems cost more.
Typical prices by system type
| System type | Typical installed cost |
|---|---|
| Single split system (1 room) | £1,500 – £3,000 |
| Multi-split system (2–3 rooms) | £2,500 – £5,000 |
| Multi-split system (4–5 rooms) | £4,000 – £8,000 |
| Ducted / concealed system | £4,000 – £12,000+ |
| Cassette unit (commercial) | £2,000 – £5,000 per unit |
| Portable AC unit supply only | £300 – £900 |
What affects the price?
The biggest cost driver is the capacity of the outdoor unit and the number of indoor units connected to it. Larger properties, or those needing cooling in multiple rooms simultaneously, require a higher-capacity system with more pipework — all of which adds to the installation time and material cost.
Access also matters. A straightforward back-to-back installation — where the indoor unit is on an external wall — is the quickest and cheapest option. Long pipe runs through internal walls or ceilings add time and cost. First-floor installations may also need scaffolding or a tower for the outdoor unit.
Brand and specification
Premium brands such as Daikin, Mitsubishi Electric and Fujitsu command a price premium over mid-range alternatives from LG, Samsung or Panasonic — but they tend to be more efficient, quieter and backed by longer warranties. For a property you plan to stay in long term, the premium is usually worth it.
Inverter vs fixed-speed
Almost all modern split systems are inverter-driven, meaning the compressor adjusts its speed rather than simply switching on and off. This makes them significantly more energy-efficient than older fixed-speed models and typically reduces running costs by 30–50%. Avoid fixed-speed units unless there is a specific reason — the energy saving over a few years will more than cover the price difference.
Running costs
A typical 2.5kW split system running for 8 hours a day at current UK electricity rates costs around £1.00–£1.50 per day to run. Heat pump mode (heating in winter) is generally 2–4 times more efficient than a conventional electric heater for the same heat output.
Get free quotes from local engineers
The best way to get an accurate price is to have an F-Gas certified engineer survey the property and specify the right system for your needs. Use our free quote service to get up to 3 quotes from vetted local air conditioning engineers — no obligation, completely free. Get your free quotes here.