Home Air Conditioning in the UK
UK summers now bring heatwaves most homes were never built for, and fitted air conditioning has quietly become affordable: a single bedroom system costs £1,500 to £3,000 installed and most modern units heat in winter too. This guide covers the system types, what each costs, what size you need, and when a portable unit is (and isn't) the answer.
Quick Answer
Home air conditioning in the UK starts at £1,500 to £3,000 fitted for a single-room wall-mounted split system. A multi-split cooling 2 to 3 rooms costs £4,000 to £8,000, and ducted whole-house systems £8,000 to £15,000. Most modern units are air-to-air heat pumps that heat efficiently in winter as well as cooling in summer.
Fact-checked by John Rooney, Solar Energy Editor. Editorial policy
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The four types of home air conditioning
| Type | How It Works | Cost Fitted | Best For |
|---|---|---|---|
| Wall-mounted split | One outdoor condenser, one indoor wall unit | £1,500 to £3,000 | Cooling one room properly |
| Multi-split | One outdoor condenser feeding 2 to 5 indoor units | £4,000 to £8,000 (2 to 3 rooms) | Bedrooms + living space |
| Ducted | Central unit pushing cooled air through concealed ducts | £8,000 to £15,000 | Whole-house comfort, invisible indoors |
| Portable | Freestanding unit with a hose out of the window | £250 to £700, no install | Occasional use, renters |
Full price detail, including the unit vs labour split and what moves quotes up or down, in the cost guide. How the fitting day actually works is covered in the installation guide.
What size air conditioner do you need?
Air conditioning capacity is quoted in kilowatts or BTU. As a rule of thumb for UK rooms with normal ceilings:
| Capacity | BTU | Room Size | Typical Room |
|---|---|---|---|
| 1.5 kW | 5,000 | Up to ~15 m² | Small bedroom, study |
| 2.5 to 2.6 kW | 9,000 | ~15 to 20 m² | Double bedroom |
| 3.5 kW | 12,000 | ~20 to 30 m² | Living room |
| 5 kW+ | 18,000+ | ~30 m²+ | Open-plan kitchen-diner |
South-facing rooms, big windows and loft rooms need more capacity than the floor area alone suggests. A good installer sizes the unit properly during the survey rather than guessing from square metres, which is one more reason to get a professional quote instead of buying a boxed unit online.
Air conditioning for bedrooms
Sleep is the reason most UK homes finally fit air conditioning. A wall-mounted split for a double bedroom is typically a 2.5 kW unit at the lower end of the £1,500 to £3,000 range, and decent modern units run at library-quiet noise levels indoors on their night setting. Position matters: the indoor unit goes high on the wall, angled so cooled air doesn't blow directly across the bed. Portable units, by contrast, sit in the room with you, rumbling at a volume most people cannot sleep through.
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| Portable Unit | Fitted Split System | |
|---|---|---|
| Upfront cost | £250 to £700 | £1,500 to £3,000 |
| Noise | In the room with you | Compressor outside; indoor unit quiet |
| Efficiency | Poor; hot hose leaks heat back in | 3 to 4 kW output per kW of electricity |
| Window | Hose through an open window | Sealed room, small pipe hole in wall |
| Heats in winter | No (cooling only) | Yes, most models |
| Renters | Yes | Needs landlord consent |
A portable unit is the right call for occasional heatwave use or a rented flat. If you find yourself running one for weeks each summer, a fitted split does the job properly for a few times the price, and adds winter heating.
The unit that heats too
Most modern split systems are air-to-air heat pumps: run in reverse, they deliver roughly 3 to 4 kilowatts of heat per kilowatt of electricity, making them one of the cheapest ways to heat a single room. That turns air conditioning from a six-weeks-a-year luxury into a year-round appliance. Note the £7,500 Boiler Upgrade Scheme grant does not apply: it covers air-to-water and ground source heat pumps that provide heating and hot water, and cooling-capable air-to-air units sit outside it.
All air conditioning guides
Cost Guide
£1,500 to £3,000 a room fitted: the full price breakdown.
Installation
The fitting process, F-Gas rules and choosing an installer.
Wall-Mounted Units
The standard fitted system: how splits work and cost.
Octopus Air Conditioning
How the Trusted Partner referral works, and the Cosy Cooler.
Commercial Aircon
Splits, cassettes, ducted and VRF for business premises.
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Home Air Conditioning FAQ
Is home air conditioning worth it in the UK?
Increasingly, yes. UK heatwaves are getting longer and hotter, a single-room system now costs £1,500 to £3,000 fitted, and most modern units double as efficient winter heating. For homes that suffer through hot bedrooms every summer, it is one of the cheaper comfort upgrades available.
What is the best type of air conditioning for a house?
A wall-mounted split system for one room, a multi-split for 2 to 5 rooms off a single outdoor unit, or a ducted system for invisible whole-house cooling. Most UK homes start with a single split in the main bedroom or living room.
What size air conditioning unit do I need?
Roughly 1.5 kW (5,000 BTU) for a small bedroom, 2.5 kW (9,000 BTU) for a double bedroom, 3.5 kW (12,000 BTU) for a living room, and 5 kW+ for open-plan spaces. South-facing rooms and lofts need more. An installer should size the unit on a survey rather than from floor area alone.
Can home air conditioning heat in winter?
Most modern split systems are air-to-air heat pumps that heat as well as cool, delivering roughly 3 to 4 kW of heat per kW of electricity. That makes them one of the cheapest ways to heat a single room, and turns the system into a year-round appliance.
Is a portable air conditioner good enough?
For occasional use or rented homes, yes. But portables are noisy enough to disturb sleep, inefficient because the hot exhaust hose leaks heat back into the room, and need a window open for the hose. Regular users almost always end up happier with a fitted split.
Do I need permission to install air conditioning at home?
Homeowners usually just need a sensible outdoor unit position; rules differ for flats, listed buildings and conservation areas, where planning permission can be required. Renters need landlord consent. A good installer checks what applies before work starts.
Sources
- Checkatrade: Air Conditioner Installation Cost
- GOV.UK: Fluorinated Gases (F-Gas)
- Energy Saving Trust: Air Source Heat Pumps
Last updated: September 2026
John Rooney is the founder of Solar Info and has been covering the UK solar energy market since 2023. He researches every battery and inverter brand against manufacturer datasheets, MCS and Ofgem data, and feedback from the MCS-certified installers in our directory before publishing.
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