How Much Does Air Conditioning Cost in 2026?
How much does air conditioning cost to install in the UK? The cost of installing air conditioning starts at £1,000 to £2,500 for a single-room unit. A multi-split system for 2 to 4 rooms costs £3,000 to £6,000. Ducted air conditioning cost for a whole house is £5,000 to £15,000. Home air conditioning in the UK is increasingly popular as summers get warmer. Here is the full breakdown.
£1,000
Single unit from
£3,000
Multi-split from
8–15p/hr
Running cost
1 day
Typical install
Prices updated April 2026 · Based on industry data and contractor submissions.
F-Gas certification required. Air conditioning installation must be carried out by an F-Gas certified engineer. Handling refrigerant without certification is a criminal offence. Check your installer's credentials on the gov.uk F-Gas register before work begins.
Air Conditioning Installation Cost by System Type
What does air conditioning cost? Prices include the unit, installation, and standard pipework.
Single wall-mounted unit (2.5kW)
One room, supply and fit, standard installation
£1,500
£1,000 – £2,000
Single wall-mounted unit (3.5kW)
One larger room, supply and fit
£2,000
£1,500 – £2,500
Multi-split (2 rooms)
One outdoor unit serving two indoor units
£3,500
£3,000 – £4,500
Multi-split (3-4 rooms)
One outdoor unit serving three or four rooms
£5,000
£4,000 – £6,000
Ducted system (whole house)
Concealed units, ductwork through ceiling voids
£10,000
£5,000 – £15,000
Portable unit (no installation)
Freestanding, vents through window hose
£400
£250 – £600
Air Conditioning Running Costs
What does it cost to run air conditioning? Based on an electricity rate of around 24p per kWh.
| Unit | Per Hour | 8 Hours | Per Month |
|---|---|---|---|
| 2.5kW wall unit | 8–10p/hr | 64–80p | £20 – £25 |
| 3.5kW wall unit | 10–14p/hr | 80p – £1.12 | £25 – £35 |
| 5kW wall unit | 14–20p/hr | £1.12 – £1.60 | £35 – £50 |
| Portable unit (2.5kW) | 20–30p/hr | £1.60 – £2.40 | £50 – £75 |
Monthly costs assume 8 hours daily use during warm months. Actual costs depend on room insulation, outdoor temperature, and thermostat setting.
Additional Costs
| Item | Typical Cost |
|---|---|
| Outdoor unit bracket | £50 – £150 |
| Extended pipe run (per metre) | £20 – £40 |
| Electrical supply upgrade | £150 – £400 |
| Core drilling (per hole) | £50 – £100 |
| Annual service | £80 – £150 |
| Trunking / pipe concealment | £100 – £300 |
Air Conditioning Costs by Region
Installation costs vary by region. Note that if you live in a conservation area or listed building, you may need planning permission for an outdoor condenser unit. These are average prices for a single wall-mounted unit, supply and fit.
| Region | Average Cost | vs National |
|---|---|---|
| London | £2,400 | +26% |
| South East | £2,100 | +11% |
| East of England | £2,000 | +5% |
| South West | £1,950 | +3% |
| Midlands | £1,900 | Average |
| Yorkshire | £1,700 | -11% |
| North West | £1,750 | -8% |
| North East | £1,600 | -16% |
| Scotland | £1,700 | -11% |
| Wales | £1,650 | -13% |
How to Get Your Air Conditioning for Less
Air conditioning is becoming more common in UK homes, especially with hotter summers. The Energy Saving Trust recommends heat pumps as one of the most efficient forms of electric heating and cooling. Here is how to keep the cost down.
Install in autumn or winter when demand is lowest
Air conditioning installers are swamped every summer when the heatwaves hit. Prices spike and lead times stretch to weeks. Book the installation in autumn or winter - you get a better price, faster service, and the system is ready before the next hot spell arrives.
Choose an inverter unit over a fixed-speed model
Inverter units adjust their speed to match the cooling load rather than cycling on and off. They are 30–50% cheaper to run, much quieter, and maintain a more consistent temperature. The upfront cost is slightly higher but the running cost savings pay for the difference within a couple of years.
Do not oversize the unit
A unit that is too powerful for the room wastes energy and money. It cools the air too fast, shuts off, then starts again - this short-cycling increases wear and running costs. A good installer will calculate the exact cooling load based on room size, insulation, glazing, and orientation.
Use the heating mode in winter to save on gas bills
Air-to-air heat pumps produce 3–4kW of heat per 1kW of electricity. At current energy prices, this makes them cheaper than gas central heating per kWh of heat delivered. Using your air conditioning for supplementary heating in spring and autumn can noticeably reduce your gas bill.
What to Expect: The Installation Process
- 1
Survey and sizing
An F-Gas engineer visits to assess the room, calculate the cooling load, and recommend the right unit size and position. They check the external wall for pipe routing and find the best spot for the outdoor condenser unit.
- 2
Core drilling and pipe run
A hole is drilled through the external wall for the refrigerant pipes, condensate drain, and electrical cable. The outdoor unit is mounted on a wall bracket or ground stand. Pipes are connected and pressure-tested for leaks.
- 3
Indoor unit fitted
The indoor unit is mounted on the wall (usually high up near the ceiling for the best airflow). It connects to the pipe run from the outdoor unit. The condensate drain is routed to an external drain point.
- 4
Electrical connection and commissioning
The system is connected to the electrical supply, charged with refrigerant, and commissioned. The engineer runs it in both cooling and heating modes to check everything works properly. They programme the remote control and walk you through the settings.
- 5
Handover
The engineer cleans up, fills in the F-Gas log (a legal requirement recording the refrigerant type and charge), and provides the manufacturer warranty documentation. They should also explain filter cleaning and when to book the annual service.
Frequently Asked Questions
How much does air conditioning cost to install?
A single-room wall-mounted unit costs £1,000–£2,500 fully installed. A multi-split system serving 2–4 rooms costs £3,000–£6,000. A ducted whole-house system costs £5,000–£15,000. The price depends on the system type, number of rooms, property size, and how easy it is to route pipes and cables.
How much does air conditioning cost to run?
A typical wall-mounted air conditioning unit costs 8–15p per hour to run for cooling, depending on the unit size and your electricity tariff. Running it for 8 hours a day during a hot spell works out at roughly £40–£80 per month. Modern inverter units are significantly cheaper to run than older fixed-speed models because they adjust output rather than cycling on and off.
Do I need planning permission for air conditioning?
You do not normally need planning permission for a domestic air conditioning unit under permitted development rights. However, if you live in a conservation area, listed building, or flat, you may need approval. The outdoor unit must also comply with noise regulations - your installer should position it to minimise disturbance to neighbours.
Can air conditioning also heat a room?
Yes. Most modern air conditioning units are heat pumps that work in reverse - they cool in summer and heat in winter. They are very efficient at heating, typically producing 3–4kW of heat for every 1kW of electricity used. This makes them cheaper to run for heating than electric radiators and useful as supplementary heating alongside a gas boiler.
Who can install air conditioning?
Air conditioning must be installed by an F-Gas certified engineer. F-Gas certification means they are qualified to handle refrigerant gases safely and legally. It is a criminal offence to install, maintain, or dispose of air conditioning equipment without F-Gas certification. Always check your installer's credentials before work starts.
Written by James Carter, Less.co.uk energy specialist
Last updated: April 2026 · Pricing based on industry data and verified contractor submissions · Methodology
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