If you are pricing up air conditioning for a UK home, the honest answer is that it depends on more than the unit on the wall. This guide sets out the typical ranges across the market, explains what pushes a quote up or down, and covers the 0% VAT relief that applies to some domestic installations.
About the figures below. These are typical ranges across the UK market, published to help you budget and compare quotes sensibly. They are not a quotation from us. Every property is different — access, wall construction, pipe runs and electrical supply all move the number. Ask us for a firm price for your property and we will survey it and quote properly.
What Drives the Cost of an Installation
An air conditioning installation is three costs bundled into one price:
- The equipment — indoor unit, outdoor condenser, and the controls. This scales with capacity and brand.
- The labour — mounting, core drilling, running and insulating refrigerant pipework, electrical connection, then commissioning and testing.
- The site work — anything specific to your building: scaffolding, brackets, condensate routing, making good afterwards.
The third item is where quotes diverge most. A ground-floor room with the outdoor unit on the other side of the same wall is a straightforward job. A second-floor bedroom with the condenser at ground level, a long pipe run and a solid brick wall is a different piece of work entirely.
Typical Market Ranges by System Size
Single-room wall-mounted split systems are the most common domestic installation. Capacity is quoted in BTU/h — higher BTU means more cooling for a larger room.
| System size | Suits | Equipment (typical) | Labour & commissioning |
|---|---|---|---|
| 9,000 BTU/h | Bedroom, small office | £600 – £900 | £600 – £800 |
| 12,000 BTU/h | Living room, larger bedroom | £750 – £1,100 | £650 – £850 |
| 18,000 BTU/h | Open-plan space, large room | £1,100 – £1,500 | £750 – £950 |
For whole-home or multi-room cooling, the picture changes:
| System type | Equipment (typical) | Installation (typical) |
|---|---|---|
| Multi-split, 2–4 indoor units | £2,000 – £3,500 | £1,200 – £2,000 |
| Full-home ducted | £4,000 – £7,000 | £2,000 – £3,500 |
Ducted systems are usually only practical during a renovation or in a new build, because the ductwork has to be concealed. Multi-split is the more common retrofit for cooling several rooms from one outdoor unit.
0% VAT on Some Domestic Installations
The UK applies a zero rate of VAT to the installation of certain energy-saving materials in residential property, and air source heat pumps fall within that relief. Where it applies, it removes the VAT element from the supply and fit of the qualifying equipment.
Two things worth being clear about:
- The relief is tied to qualifying energy-saving materials, not to every air conditioning product. A cooling-only comfort system is not automatically covered.
- The rules have changed more than once in recent years, and eligibility depends on the specific equipment and the property. Ask your installer to confirm the VAT treatment in writing on your quotation rather than assuming it applies.
If you want to check the current position yourself, HMRC publishes the guidance in VAT Notice 708/6 on energy-saving materials.
Running Costs
Purchase price is only part of it. A modern inverter system varies its compressor speed rather than switching fully on and off, which cuts consumption substantially compared with older fixed-speed equipment.
- Look at the SEER rating for cooling efficiency and SCOP for heating efficiency if the unit is a heat pump.
- A higher-rated unit costs more upfront and less to run. Over a system life of ten years or more, that usually favours the better unit.
- Sizing matters as much as rating. An oversized system short-cycles and wastes energy; an undersized one runs flat out and never reaches temperature.
What to Check Before You Accept a Quote
- Is the engineer F-Gas certified? This is a legal requirement for anyone handling refrigerant. You can verify a company on the REFCOM register.
- Is the quote itemised? Equipment, labour and any site work should be visible separately.
- What is included in commissioning? Pressure testing, vacuum, refrigerant charge and a performance test should not be extras.
- What happens if something is found on the day? A good installer tells you before doing chargeable work, not after.
- What is the warranty position? Manufacturer warranties normally require documented annual servicing to stay valid.
Get a Firm Price for Your Property
Ranges are useful for budgeting, but they are not a quote. We survey the property, tell you what the job actually involves, and give you a fixed price before any work starts.
