How much does home air conditioning cost?

A single air conditioning unit fitted in one room typically costs between £1,500 and £3,000 in the UK, with most bedroom and living-room jobs landing around £2,000 to £2,500 supplied and fitted. Cooling a whole home with a multi-split or ducted system runs from roughly £4,500 to £10,000 or more, depending on how many rooms you cover. If you only need to take the edge off the occasional heatwave, a portable unit costs £300 to £650 and needs no installation at all. Prices in this guide were correct at July 2026 and change frequently, so always get quotes before you budget.

Those are honest ranges rather than a single sticker price, because what you pay depends on the system, the number of rooms, and how easy your home is to work in. This guide breaks down the real numbers for 2026: what each type of system costs, what is included in a quote, the extras that cheaper guides leave out, and what it all costs to run.

How much does air conditioning cost by system type?

There are four types of home air conditioning, and the price gap between them is wide. The table below shows the unit-only cost (the kit alone) against the typical installed cost (supplied and fitted).

A few words on each:

Portable units sit on the floor and vent hot air out of a window through a hose. They are cheap and need no installation, which makes them genuinely useful for renters or for the odd bad week. Be realistic about what they deliver, though: they are noisier, less efficient and weaker than a fixed unit, and the window hose lets some warm air leak back in.

Single split systems pair one outdoor condenser with one indoor wall unit, and they are the default choice for cooling a single room properly. They are far quieter and more efficient than a portable. Because they contain refrigerant, they must be fitted by a qualified engineer (more on that below). You can compare specific models in our roundup of the best air conditioning units in the UK.

Multi-split systems run several indoor units from one outdoor box, so you can cool the bedroom at night and the living room in the evening without lining your walls with condensers. More equipment and more labour means a higher price.

Ducted systems hide the indoor unit in a loft or ceiling void and deliver cooling through discreet grilles, with no boxes on the walls. It is the tidiest finish and usually the most expensive, and it suits renovations and larger homes best. If you are weighing up which type fits your home, our guide to choosing an air conditioning system walks through the decision.

Supply-only vs supplied-and-fitted: what is in the price?

Prices online split into two very different things, and it is easy to compare the wrong ones.

Supply-only means the unit alone. A 12,000 BTU wall unit (about 3.5 kW, a sensible size for an average bedroom) costs roughly £620 to £900 for the kit. That figure is what you see on retailer sites, and it is not the whole job. If a single bedroom is the job you are pricing, our guide to bedroom air conditioning covers unit choice and costs in more detail.

Supplied and fitted means the unit plus the labour, the pipework, the brackets and commissioning. For a single split, the labour alone is commonly £960 to £1,400 on top of the unit, which is how you arrive at a typical installed cost of £1,500 to £3,000 for one room. As an example of an advertised all-in price, the national installer BOXT lists air conditioning "installed from £2,199".

Day rates for air conditioning engineers run from around £280 to £720, with an average closer to £600. A single unit usually takes about a day to fit; a multi-room or complex job can take up to a week. Our guide to how air conditioning is installed explains what the engineer does on the day.

What pushes the price up?

Two identical-looking homes can get very different quotes, because the cost drivers vary. The main ones:

• Number of rooms and units. More indoor units means more cost, although the per-unit price tends to fall when several are fitted at once.

• System type. Portable is cheapest, then single split, then multi-split and ducted.

• Installation complexity. Long refrigerant pipe runs, lots of bends, thick walls to drill, or routing through a loft all add labour.

• Access. If the outdoor unit needs scaffolding or working at height, the price climbs.

• Electrical work. A fused spur and an external isolator are usually needed, and this is often quoted separately (see below).

• Brand and features. Premium brands, higher efficiency ratings, Wi-Fi control, zoning and air purification all cost more.

• Your property. Listed buildings, conservation areas and flats needing freeholder consent add cost and complication.

• Region. London and the South command the highest labour rates.

Why are my quotes so different?

If you have gathered a few quotes and they are all over the place, you are not imagining it. This is the single most common frustration with buying air conditioning, and it comes straight from the cost drivers above: a quote is a response to your specific home, not a fixed catalogue price.

The fix is to compare like with like. Ask each installer to quote the same rooms, the same number of indoor units and a similar efficiency rating, and to itemise the unit, the labour, the electrics and any extras separately. Once the quotes are broken down the same way, the real differences become obvious and the "crazy numbers" usually make sense.

A transparent, itemised quote is worth more than the lowest headline figure. If an installer will not break the price down, that tells you something.

How much does air conditioning cost to run?

Running cost depends on the unit's power draw and the price of electricity, so the honest answer is a range. As a rule of thumb, a fixed wall unit costs somewhere between 20p and 60p per hour to run.

Here is the maths so you can adjust it to your own usage. Using the Ofgem price cap unit rate of 26.11p per kWh (the July to September 2026 cap):

• An efficient wall split drawing 0.5 to 0.8 kW costs roughly 13p to 21p per hour.

• A larger 2 kW wall unit costs about 52p per hour, or roughly £33 a week if you run it nine hours a day.

• A portable unit draws more, typically 0.8 to 1.5 kW, so it costs about 21p to 39p per hour, more than a fixed split for the same room.

These are illustrative figures. Your actual cost depends on the unit, the room and how hard the system has to work, which we cover in full in our air conditioning running costs guide. One thing worth knowing: most fixed units are reverse-cycle, meaning they heat as well as cool, often delivering more than 3 kW of heat per 1 kW of electricity. That turns air conditioning from a few-weeks-a-year purchase into a system that can offset some of your winter heating.

Prices and rates correct as of July 2026. The energy price cap changes quarterly, so check the current unit rate before budgeting.

The costs people forget

Two things are easy to miss when you compare headline prices, and both are non-negotiable.

A qualified (F-Gas) installer. Any unit containing refrigerant must be installed, serviced and decommissioned by an engineer with a personal F-Gas qualification, working for a company with the right certification. Doing in-scope work without it is a criminal offence. This is why a refrigerant split cannot be a true DIY job, and why the labour line is unavoidable. Treat F-Gas certification as something to insist on, not a cost to dodge.

A cheap quote from someone without F-Gas certification is a false economy, and often an illegal one. Always check.

Notifiable electrical work. Most installs need a fused spur internally and an IP-rated isolator externally. This is certified electrical work and typically adds £400 to £700, often quoted separately from the main price. For ceiling or ducted systems, ductwork adds roughly £180 per metre plus fittings.

It is also worth budgeting for a service. A one-off home air conditioning service costs about £70 to £120 per unit, and an annual service is recommended to keep the system efficient and under warranty.

Do you need planning permission?

For most houses, a wall-mounted system that also heats (a reverse-cycle unit) can usually be fitted under permitted development, provided it meets the conditions on size, siting and noise at the boundary. A cooling-only unit is treated differently and generally does need full planning permission, so the heating function matters here.

Flats, listed buildings and conservation areas are the common exceptions: flats have tighter limits, and listed buildings always need consent. The rules also differ in Scotland, Wales and Northern Ireland. Whatever your situation, check with your local planning authority before you book, and read our planning permission guide for the detail.

Is there a grant for home air conditioning?

This changed in 2026, and the detail matters. A £2,500 grant under the Boiler Upgrade Scheme is now available for air-to-air heat pumps, effective from 28 April 2026 in England and Wales. An air-to-air heat pump is a reverse-cycle system that both cools in summer and heats in winter.

The conditions are tight. To qualify, the system must replace an existing fossil-fuel or electric heating system and become the home's main source of heat, and it must be fitted by an MCS-certified installer who redeems the voucher. A standard cooling-only split bought for summer comfort, or one fitted alongside a gas boiler you are keeping, will usually not qualify, and portables never do.

Keep this separate from the air-to-water heat pump grant, which is worth £7,500 and is for a different type of system that also provides hot water. The two are often confused. If a deal sounds like "free air con", read the eligibility rules carefully first.

Does air conditioning add value to your home?

Possibly, but treat the numbers with caution. One estate-agent estimate suggests air conditioning can add around 2.5% to a home's value. That is a single source rather than a settled figure, so it is better seen as a potential bonus than a reason to buy. The stronger case for most people is comfort in summer and, with a reverse-cycle system, cheaper heating in the shoulder seasons.