The short answer
For most UK homes, a single fixed split system costs roughly £1,500–£3,000 installed, while a multi-split serving several rooms is typically £3,000–£6,000 or more. A plug-in portable is £300–£600 but is far less efficient. On top of the purchase you should budget for running cost (about 15–25p per hour per 2.5 kW unit) and an annual service of roughly £80–£150 per unit.
“How much does air conditioning cost” has no single answer, because the price depends on the type of system, the number of rooms, the difficulty of the installation and how much you run it. This page breaks the total cost into its real parts — equipment, installation labour, electricity and servicing — so you can build a realistic budget before you ask an F-Gas-certified installer for a quote.
Air conditioning cost at a glance
- Single split installed £1,500–£3,000
- Multi-split installed £3,000–£6,000+
- Portable unit £300–£600
- Annual service £80–£150 per unit
- Running cost ~15–25p per hour per 2.5 kW unit
What makes up the total cost
The cost of air conditioning is not a single number — it is four separate figures that you should add together over the life of the system. First is the equipment: the indoor and outdoor units. Second is installation labour, which under GB F-gas law must be carried out by an F-Gas-certified engineer working for an F-Gas-registered company. Third is the electricity you use to run it. Fourth is ongoing servicing and the occasional re-gas. A cheap unit with an awkward, expensive install and heavy daily use can cost more over five years than a pricier unit that is well sited and used sparingly. Thinking in these four parts stops you fixating on the headline purchase price and ignoring the costs that actually accumulate.
- Equipment — the wall unit, the outdoor condenser, and the refrigerant pipework and brackets.
- Installation labour — mounting, pipe runs, electrical connection, vacuuming and commissioning.
- Running cost — the electricity drawn while cooling or heating.
- Maintenance — filter cleaning, an annual service, and any leak repair or re-gas.
Typical installed prices in 2026
As a market guide, a single fixed wall-mounted split system installed in a straightforward location is typically £1,500–£3,000. A multi-split — one outdoor unit feeding two or more indoor heads — usually starts around £3,000 and rises to £6,000 or more as you add rooms and complexity. A self-contained portable unit costs £300–£600 to buy outright and needs no certified installer, but it is markedly less efficient and noisier in the room. These ranges are typical market figures, not quotes; the only way to fix your real price is a site survey.
| System | Typical installed cost | Best for |
|---|---|---|
| Portable | £300–£600 (no install) | One room, occasional use, renting |
| Single split | £1,500–£3,000 | One room, permanent cooling/heating |
| Multi-split | £3,000–£6,000+ | Several rooms from one outdoor unit |
What pushes the price up or down
Two homes can get very different quotes for the same number of rooms. The biggest drivers are the length and routing of the refrigerant pipe run, whether the outdoor unit can sit at ground level or needs to be lifted to a wall or roof, the ease of getting power to the unit, and the cooling capacity (kW) you actually need. Choosing a higher energy-rating model costs more up front but reduces the running cost for the system’s whole life, so the cheapest sticker price is rarely the cheapest over time. A correct survey also avoids paying for an oversized unit that wastes both purchase money and electricity.
- Long or concealed pipe runs add labour and materials.
- High-level or roof-mounted outdoor units may need access equipment.
- An oversized unit wastes money; a correct survey avoids this.
- Extra electrical work to reach a suitable circuit raises the cost.
Running and servicing cost over time
Buying is only the start. A typical 2.5 kW split draws roughly 0.6–1.0 kWh per hour, so at a unit rate around 25p/kWh it costs about 15–25p per hour to run — that is 0.6 kWh × 25p at the low end and 1.0 kWh × 25p at the high end. An annual service is generally £80–£150 per unit, and a re-gas, if a leak develops, is £100–£300. The Energy Saving Trust’s general advice — size correctly, run efficiently and maintain the unit — is the cheapest way to keep lifetime cost down. For the detail, see our running cost and servicing cost guides, or compare a unit against a fan in air con vs fan cost.
Building your budget
A realistic budget therefore has three lines: the installed price (from the ranges above), a yearly running estimate (your run hours × the per-hour cost), and a yearly maintenance allowance (£80–£150 per unit). Add a small contingency for an eventual re-gas or repair. This page is general information, not a site-specific survey or a substitute for a quote. Always get a written quote from an F-Gas-certified installer who has seen your property.
Get a realistic figure for your home
Use these ranges to sense-check quotes, then ask an F-Gas-certified installer to survey your property and price the exact job.
Frequently asked questions
Is air conditioning worth the cost in the UK?
For year-round comfort a modern reverse-cycle split also heats the room efficiently, which spreads the value across summer and winter. Whether it is worth it depends on how much you will use it; a portable suits occasional use, a fixed split suits permanent installation.
Why is multi-split so much more than a single unit?
A multi-split needs more refrigerant pipework, more indoor heads, a larger outdoor unit and considerably more installation labour, which is why it typically runs £3,000–£6,000 or more.
Are there hidden costs after installation?
The recurring costs are electricity (about 15–25p per hour per 2.5 kW unit), an annual service of £80–£150 per unit, and occasional re-gas at £100–£300 if a leak develops.
Can I reduce the cost by installing it myself?
No. Under GB F-gas law, installing or charging a refrigerant system must be done by an F-Gas-certified engineer. DIY refrigerant work is illegal, so the labour is unavoidable.
Sources & further reading
- Energy Saving Trust — guidance on home cooling and running costs
- gov.uk — the Fluorinated Greenhouse Gases Regulations 2015 (GB F-gas)
- Ofgem — typical domestic electricity unit rates
- gov.uk — DEFRA F-gas guidance for businesses and engineers
This guide is general information, not a site-specific survey or a substitute for a quote from an F-Gas-certified installer. Installation, servicing and refrigerant handling are legally restricted to F-Gas-certified engineers.