Single Split Air Conditioning Cost UK 2026
A single split air conditioning system — one wall-mounted indoor unit paired with one outdoor unit to cool a single room — typically costs £1,500–£3,000 supplied and installed in the UK in 2026, with most one-room jobs landing around £1,800–£2,500. This guide breaks the price down by room size, shows what the fitter's bill actually covers and explains what pushes your quote up or down.
How much does a single split system cost?
In 2026, a single split air conditioning system costs about £1,500–£3,000 supplied and installed to cool one room, with a typical straightforward job coming in around £1,800–£2,500. The equipment (indoor and outdoor unit) is usually £600–£1,400 and the installation labour £700–£1,200, plus pipework and electrical connection. Because refrigerant is involved, the work must be carried out by an F-Gas certified engineer — that is a legal requirement, not an optional extra. The biggest saving is comparing at least three installers on the same room specification.
| Room size | Typical unit | Installed cost (2026) |
|---|---|---|
| Small room / bedroom | 2.0–2.5kW (7,000–9,000 BTU) | £1,500–£2,200 |
| Medium room / lounge | 3.5kW (12,000 BTU) | £1,800–£2,600 |
| Large / open-plan room | 5.0kW (18,000 BTU) | £2,300–£3,200 |
| Premium brand or awkward install | 3.5–5.0kW, long pipe run | £2,800–£3,500+ |
Supplied-and-installed prices including VAT, based on UK installer quote data gathered in 2026. London and the South East, including Surrey, typically sit toward the top of each range. Always compare at least three quotes.
What is included in the price?
A single split quote bundles the equipment, the labour to fit it and the materials that connect indoor to outdoor. Here is how a typical £1,800–£2,500 one-room installation breaks down.
| Element | What it covers | Typical cost |
|---|---|---|
| Indoor + outdoor unit | Wall-mounted indoor head and outdoor condenser | £600–£1,400 |
| Installation labour | 4–8 hours for one engineer or a two-person team | £700–£1,200 |
| Pipework & materials | Refrigerant pipe, brackets, trunking, cabling, condensate drain | £150–£400 |
| Commissioning & F-Gas sign-off | Vacuum, charge, test and certification | Usually included |
A standard single split is normally a one-day job. Prices are indicative and depend on a survey. For multi-room pricing, see our multi-split cost guide.
What moves your single split price
Two one-room jobs can be quoted hundreds of pounds apart. These are the variables that matter most on a single split installation.
- Cooling capacity (kW) — the unit must be sized to the room. A large, south-facing or open-plan room needs more kW, a bigger unit and a higher price than a small bedroom.
- Brand and range — premium names such as Daikin and Mitsubishi Electric sit at the top but bring quieter units, higher efficiency and longer warranties; strong mid-range brands keep the total down. Compare on our brands hub.
- Pipe run length — the further the indoor unit is from the outdoor unit (for example an upstairs room over a ground-floor condenser), the more pipework, trunking and labour the job needs.
- Indoor unit style — a standard wall unit is cheapest; floor-standing or ceiling-cassette heads cost more but suit certain rooms.
- Access and mounting — an easy ground-floor wall is quick; scaffolding, high-level work or a difficult condenser position adds time and cost.
- Electrical work — a new dedicated circuit or a consumer-unit upgrade, if needed, adds to the bill.
- Location — London and the South East, including Surrey, typically run 20–30% above the national average on labour.
What does a single split cost to run?
Installation is one number; running it is another. At the Ofgem price cap electricity rate of around 26p per kWh (July–September 2026), a typical 2.5kW single split costs roughly 18–23p an hour to cool — because an inverter unit throttles back once the room reaches temperature rather than running flat out.
In practice that means a single split used for a few hours on warm evenings usually adds a modest amount to the electricity bill rather than a dramatic one — as a rough sum, three hours' cooling most evenings across a hot spell works out at only a pound or two a week. The same unit also heats the room efficiently in winter — a seasonal efficiency (SCOP) of 3.5–4+ means more than three units of heat per unit of electricity — so it can double as a cheap-to-run heater on cold days. Delivering heat at a SCOP of around 3.5–4, a 2.5kW unit draws roughly 0.6–0.7kW to run, so about 16–20p an hour at the current ~26p/kWh cap rate; that is usually cheaper per unit of heat than a plug-in electric heater and competitive with gas central heating for taking the chill off one room. Note that air-to-air air conditioning is not eligible for the main £7,500 Boiler Upgrade Scheme, which funds air-to-water heat pumps only; a narrow £2,500 air-to-air grant route opened on 28 April 2026 for homes currently on direct electric heating that use an MCS-certified installer and product, so check the latest Ofgem criteria before assuming you qualify. Most fixed installations do, however, benefit from 0% VAT until 31 March 2027. For the full picture, see our running costs guide.
Is a single split right for you?
A single split is the simplest and cheapest way into fixed air conditioning — one room, one indoor unit, one outdoor unit. It is the natural choice if you mainly want to cool one space, such as a bedroom, home office or lounge.
If you want to cool two or more rooms, it is usually worth pricing a multi-split, which shares one outdoor unit between several indoor heads and keeps the exterior tidier — see our multi-split cost guide. For a bedroom specifically, our bedroom air conditioning cost page covers quiet-running options in detail, and our broader installation cost guide puts single split pricing alongside every other system type. A fixed single split costs more upfront than a plug-in portable unit, but it is quieter, far more efficient and does not need a hose hanging out of a window.
Frequently asked questions
Sources & methodology
- Installed-price ranges compiled from UK installer quote data gathered during 2026 across single-room split installations.
- Electricity running-cost context from the Ofgem energy price cap, unit rate ~26p/kWh for 1 July–30 September 2026.
- Equipment specifications and warranty terms from manufacturer published data (Daikin, Mitsubishi Electric, Fujitsu, Panasonic, Toshiba, Hitachi, LG, Samsung).
- Prices are supplied-and-installed including VAT and are indicative, not quotations. Your price depends on a survey.
Get accurate single split prices
Air Con Surrey is a free matching service. Tell us which room you want to cool and we'll match you with vetted, F-Gas certified air conditioning engineers who survey your home and quote for exactly your job — so you compare real prices, not estimates.