How much does air conditioning cost in the UK?
The short version: a professionally installed single-room split system usually lands between £1,500 and £3,500 fully fitted. Multi-room systems run £3,500–£6,000+, whole-home ducted systems start around £5,000 and can pass £10,000, and a decent portable unit — the only option that needs no installation — costs £300–£600 off the shelf.
A quick terminology note, because searches mix the vocabularies: what Americans call an HVAC system or a mini-split is, in UK homes, simply a split-system air conditioner — and "ductless mini-split cost" questions map directly onto the single-split prices below. UK domestic installs almost never involve US-style central ducted HVAC unless you're building or renovating.
Installed prices by system type
| System | Typical installed price | Best for |
|---|---|---|
| Portable unit | £300–£600 (no install) | Renters, occasional use, one small room |
| Single split (1 room) | £1,500–£3,500 | Bedrooms, home offices, living rooms |
| Multi-split (2–4 rooms) | £3,500–£6,000+ | Cooling several rooms off one outdoor unit |
| Ducted (whole home) | £5,000–£10,000+ | New builds, renovations, invisible finish |
Each additional room on a multi-split typically adds roughly £700–£1,500, depending on pipe runs and access — though the per-room rate falls when everything is installed in one visit.
What's actually in the quote
A standard single-split installation should include the indoor and outdoor units, mounting brackets, refrigerant pipework and electrical connection, commissioning, and waste removal. Things that push the price up:
- Long pipe runs between indoor and outdoor units, or awkward access (high walls, scaffolding).
- Electrical work — AC needs a dedicated circuit, so a full consumer unit upgrade adds cost if yours has no spare capacity.
- Older or solid-wall properties where drilling and routing take longer.
- Season — summer installs can cost 10–20% more than the same job in winter or spring, and lead times stretch. If you can plan ahead, book in the colder months.
- Region — London and the South East price higher than the national average.
Benchmark your job first: our installation cost calculator gives a fitted price range for your rooms, property and region in 30 seconds.
Rule of thumb for judging a quote: get at least three, make sure each itemises the unit model, pipework allowance and electrical work, and confirm the installer is F-Gas certified (legally required) with public liability insurance. A free pre-quote home survey is a good sign.
Running costs per hour
At current electricity prices (the July 2026 price cap puts electricity around 26p/kWh), typical costs look like this:
| System | Typical running cost |
|---|---|
| Modern inverter split (3.5 kW) | ~10–50p per hour — a typical unit draws about 1 kW, so ~26p/hr |
| Portable (8,000–9,000 BTU) | ~25–35p per hour |
| Multi-split, two rooms running | ~50–80p per hour |
For per-hour detail and a free running-cost calculator, see our running costs guide. Inverter models adjust their output to hold temperature rather than switching on and off, which can cut consumption by 30–40% versus non-inverter units. Splits also beat portables on efficiency because the heat-rejecting half of the machine sits outside your room instead of inside it.
The winter bonus most people miss
Nearly all modern split systems are reversible air-to-air heat pumps. The same unit that cools in July heats in January — and heating one room this way is usually cheaper than plug-in electric heaters. If you work from home, that can materially change the payback maths on a £2,000 install.
Ongoing costs
Budget £70–£120 per unit for an annual service. A well-maintained split system lasts 10–15 years; portables more like 5–10 — and most mid-life problems are preventable with basic upkeep (see our troubleshooting and maintenance guide).
Ready for real numbers? Prices vary too much by property for any guide to be exact. Get up to three free quotes from F-Gas certified installers — or work out what size you need first.