Air Conditioning Installation Cost UK 2026

If another sticky summer has you pricing up a proper fix for a stifling bedroom or a sweltering home office, the first thing you need is an accurate idea of what you’ll pay. This guide breaks down air conditioning installation costs in the UK for 2026: typical market prices, our own fixed package prices, what pushes a quote up or down, and the heating function that changes the value case.

How much does air conditioning installation cost in the UK?

Typical fitted prices at a glance (UK market, 2026)

System type	Typical installed cost (2026)	Best for
Portable unit	£300 to £1,000	Occasional heatwave use
Single split, 1 room	£1,800 to £3,500	One bedroom or living room
Multi-split, 2 rooms	£3,500 to £7,600	Two bedrooms, or a bedroom and office
Multi-split, 3 rooms	£5,445 to £9,081	Most of the upstairs
Ducted system	£3,000 to £15,000+	Whole-house cooling in larger homes

Eco Happy fixed package prices

System	Eco Happy price from	Notes
1 room (single split)	£2,160	£2,160 – £2,526 depending on room size (2.5kW to 7kW)
2 rooms (multi-split)	£3,389.98	Two indoor units sharing one outdoor unit
3 rooms (multi-split)	£4,614.96	Three indoor units sharing one outdoor unit
4 rooms (multi-split)	£5,484.94	Four indoor units sharing one outdoor unit
5 rooms (multi-split)	£6,287.44	Larger homes may use two outdoor units

Live in South Yorkshire? See our Sheffield air conditioning prices.

Eco Happy fixed air con price by number of rooms (Haier Pearl Premium, small rooms)

1 room£2,160

2 rooms£3,389.98

3 rooms£4,614.96

4 rooms£5,484.94

5 rooms£6,287.44

Market ranges are wide because the installed price depends as much on your property as on the unit. Warmzilla’s 2026 figures put a two-room multi-split at £4,293 to £7,624 and a three-room system at £5,445 to £9,081. Heatable quotes multi-splits from £3,500 to £6,000 or more, with each additional indoor unit adding roughly £800 to £1,200. MyJobQuote records single-room jobs from £550, but that end of the market generally means a small unit, a short pipe run and a simple ground-floor install.

What decides your quote?

Underneath all of this is a legal requirement: anyone handling refrigerant must hold the right F-Gas qualification. That specialist work is one reason a properly installed split system costs more than a portable air conditioner.

Single split vs multi-split: the per-room maths

Warmzilla puts single splits at £1,800 to £4,500+ per room, so three completely separate systems can quickly reach five figures. With a multi-split, several indoor units share one outdoor unit, so each extra room costs far less than another standalone system. In our own prices, going from one room (from £2,160) to two rooms (from £3,389.98) adds about £1,230. See our full multi-split air conditioning cost guide for 2 to 5 room prices.

Multi-split isn’t automatically best. Every indoor unit depends on the same outdoor unit, and if two rooms are at opposite ends of the house, two simple single splits with short pipe runs can work out cheaper than one multi-split with complicated routing.

Our full split vs multi-split air conditioning guide compares the two in detail. Still weighing up a plug-in unit? Read split vs portable air conditioning, or browse everything in our air conditioning hub.

Heating as well as cooling

Nearly every modern fixed split system is reversible, which makes it an air-to-air heat pump. The same unit that cools a bedroom in July can heat it in November, and because heat pumps move heat rather than generate it, they can deliver several units of heat for every unit of electricity they use.

That makes a split system useful for heating one or two well-used rooms in spring and autumn. Read more in our guide to heating your home with air conditioning.

What does air conditioning cost to run?

At an electricity rate of 24.67p per kWh, Heatable puts an efficient split system at roughly 7p to 12p per hour and a three-room multi-split at around 37p per hour, compared with about 20p to 25p per hour for a portable unit. Actual costs depend on efficiency, output, insulation, your tariff and how hard the system works.

Our guide to air conditioning running costs in the UK goes into the numbers in more detail.

Why air con quotes vary so much

Ask three installers to price the same house and the difference can be significant. A survey-based quote accounts for real pipe runs, wall construction, drainage, outdoor-unit position and electrical work, while a remote estimate has to make assumptions. Demand also jumps in hot weather, which can affect availability and price.

• The exact brand, model and cooling capacity of each unit
• How many indoor and outdoor units are included
• The pipework allowance per room and the price for extra metres
• Electrical work and isolation switches
• Condensate drainage or pumps
• Warranty length and who provides it
• Access equipment, if needed
• The VAT rate applied

Do you need planning permission?

Requirements depend on the type and position of the outdoor unit, your property and local restrictions. Flats, listed buildings and homes in conservation areas may need extra checks. See our air conditioning planning permission guide.

Pay monthly for your air con

Prefer to pay monthly? Air con finance is provided by Zopa after a £100 deposit, subject to status. See air con finance options and a representative example →

Get your Eco Happy air con quote

What’s included in every Eco Happy air con installation

• Full F-Gas certified installation by qualified engineers
• 6-year parts and labour warranty (Haier Pearl Premium)
• Fitting of indoor and outdoor units, pipework and electrics
• Condensate pump or drain, with routing for safe drainage
• Electrical connection from each outdoor unit, with an isolation switch where required
• Tightness and pressure testing of the refrigerant lines
• Full commissioning, controls walkthrough and certification
• Manufacturer warranty registration
• Protection of floors, walls and surfaces
• Safe waste removal and making good of affected surfaces
• 12-month workmanship warranty, direct with Eco Happy
• Exclusive Eco Happy warranty and access to our customer support line

Not included: access equipment such as scaffolding, which is quoted separately if needed.

What our customers say

Rated 4.6 out of 5 from 655 reviews on Trustpilot (November 2026). Read all reviews, good and bad →

Air conditioning installation cost FAQs

How much does air conditioning installation cost in the UK?

Most single-room split systems cost £1,800 to £3,500 installed in 2026, two-room multi-splits £3,500 to £7,600 and three-room systems £5,445 to £9,081. At Eco Happy, a single-room Haier Pearl Premium system costs from £2,160 fully installed, two rooms from £3,389.98 and three rooms from £4,614.96.

What does the Eco Happy air con price include?

One fixed package price covers the indoor and outdoor units, F-Gas certified installation, pipework up to the allowance agreed at sale, electrics, a condensate pump where needed and commissioning. Extra pipe is £50 per metre and extra power cable £15 per metre.

How long does air con installation take?

A straightforward single split usually takes four to seven hours, so many are done in a day. Multi-split systems and more complex routing can take longer, and larger multi-split or ducted systems can take several days.

Do I need planning permission for air conditioning?

Often not for a typical house, but it depends on where the outdoor unit goes and your property. Flats, listed buildings and conservation areas may need permission, so check our planning permission guide before you book.

What size air conditioning unit do I need?

It depends on the room size, insulation, windows and how the room is used. As a guide we use 2.5kW for small rooms (up to 18m²), 3.5kW for medium rooms, 5kW for large rooms and 7kW for extra-large rooms up to 50m², and the survey confirms it.

Is a single split or multi-split better?

A multi-split is usually better value per room when the rooms are close together, because they share one outdoor unit. If rooms are far apart, two single splits can be simpler and cheaper. See our split vs multi-split guide.