How much does air conditioning cost in the UK?
The short answer
Installation prices vary materially with the system design, number of rooms, pipework route, electrical work, access and local constraints. Ask an F-Gas-qualified installer for an itemised quote for your property rather than relying on a generic national range.
A £2,500 government grant is available for eligible residential air-to-air heat pumps under the Boiler Upgrade Scheme. It can support qualifying replacements of fossil-fuel or non-heat-pump electric heating, but not a single unit added solely for summer cooling.
See whether the £2,500 grant applies to your home. Five questions, no account.
Check eligibilityWhat an itemised quote should cover
Air conditioning in a UK home often means a split system: one outdoor condenser, one or more indoor units, and refrigerant pipework between them. A quote should identify the proposed model, room coverage, pipework, condensate drainage, electrical work, commissioning and any access work.
| System | What it covers | Quote scope to confirm |
|---|---|---|
| Portable unit | One room, no installation | Unit, delivery and warranty |
| Single split | One room, one indoor unit | Unit, refrigerant work, drainage and electrics |
| Multi-split | Multiple indoor units, one condenser | Room-by-room capacity and pipework routing |
| Whole-home design | Multiple rooms | Heating design, hot-water provision and access work |
CoolGrant does not publish a national fitted-price range because it is not set by a primary public source and cannot establish the cost of a specific installation.
Compare like-for-like quotes: the same room coverage, model specification, electrical scope, access assumptions, warranties and exclusions. This makes a lower headline price easier to evaluate.
Where you live changes the number
Local access, parking, building form, planning constraints and leasehold permissions can all change the scope and price of an installation. Obtain a quote based on the proposed location and route for pipework.
If you are in a London borough, check the planning position before you get quotes. Several boroughs treat external units on front or side elevations as needing consent, and conservation areas remove permitted development rights that would otherwise apply.
What size unit do you need?
Sizing is the decision that most affects whether you are happy with the result. Undersized and the room never gets cool. Oversized and the unit short-cycles: it hits temperature fast, switches off before it has pulled moisture out of the air, and leaves the room cold and clammy.
The rule of thumb used across the UK trade is about 0.1 kW of cooling capacity per square metre of floor area, rising to about 0.15 kW per square metre for kitchens and rooms that catch full afternoon sun.
| Room | Typical capacity | Approximate BTU |
|---|---|---|
| Small bedroom | 2.0 to 2.5 kW | 7,000 to 9,000 |
| Large bedroom or home office | 2.5 to 3.5 kW | 9,000 to 12,000 |
| Living room | 3.5 to 5.0 kW | 12,000 to 18,000 |
| Open-plan kitchen and living | 5.0 to 7.0 kW and above | 18,000 to 24,000+ |
Add roughly 15 to 20 per cent for older or single-glazed properties, about 20 per cent for kitchens, and about 10 per cent for each extra metre of ceiling height above standard.
The £2,500 grant: what it does and does not cover
This is where most cost guides stop short, and where the numbers change materially.
Air conditioning and an air-to-air heat pump are the same machine. A modern split system runs in reverse in winter and heats the room. In April 2026 the government made air-to-air heat pumps eligible for a £2,500 grant under the Boiler Upgrade Scheme, alongside the existing £7,500 for air-to-water and ground source systems.
The grant is for heating, not cooling, and the rules rule out the most common purchase. The system must replace qualifying fossil-fuel heating (such as gas, oil or LPG) or non-heat-pump electric heating. A fossil-fuel heat-generating appliance cannot remain as part of the new heating system, and a hybrid system is not eligible. The heat pump must be capable of meeting the property's full space-heating demand, and the combined system must be capable of meeting its full space-heating and hot-water needs. That means an installer must design a whole-property heating solution; a single bedroom unit will not qualify on its own. It is England and Wales only, one grant per property, residential only. An MCS certified installer applies on your behalf and deducts the grant from your invoice, so you never handle the money.
A cooling-only purchase is not grant eligible. If a proposed whole-property heating system meets the scheme conditions, the installer must show the £2,500 BUS discount in the quote and on the invoice.
Grant eligibility is confirmed by Ofgem on the installer-led application, not by a price illustration.
Ofgem's Product Eligibility List, updated 23 July 2026, includes air-to-air heat-pump models. A listing alone does not confirm a particular installation is eligible: the installer must still check the product, property and installation against the current rules. Our grant status page tracks the current position.
What it costs to run
At the Ofgem price cap for 1 July to 30 September 2026, electricity is 26.11p per kWh.
Actual running cost depends on the chosen product's published seasonal performance, the heat loss of the property, controls, room coverage, tariff, region and usage. The price cap is not a personalised tariff or a saving estimate.
For factors that affect running costs and the grant conditions, see our air to air heat pump cost guide.
Why the cheapest quote is often not legal
Under F-Gas regulations, the refrigerant side of a split system must be installed by a suitably qualified engineer. Ask how the installer meets the applicable F-Gas requirements and check their credentials before booking.
If you intend to claim the grant, the installer also needs MCS certification for the relevant technology. That is separate from F-Gas qualifications.
How to reduce what you pay
Ask for a design that states which rooms are covered, how heating and hot water are provided, and the model-specific performance figures.
Get comparable itemised quotes from suitably qualified installers and check that each covers the same design and scope.
Compare the selected models' published seasonal performance, sound levels, warranty and installation scope rather than relying on brand labels.
Check grant eligibility before committing to a specification. The installer must confirm the product, property and design meet the current BUS rules.
Find out in 60 seconds whether the government will pay £2,500 towards your system.
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