How much does home air conditioning cost in the UK?
A single-room air-to-air system (one indoor wall unit, one outdoor unit) typically costs £1,800–£2,600 installed in the UK. Multi-room systems start around £3,400 and scale with the number of rooms. Because these systems are air-to-air heat pumps — they heat in winter as well as cool in summer — a £2,500 Boiler Upgrade Scheme grant can apply where the installation is MCS-certified and the home qualifies, which changes the maths considerably.
What drives the price
Unit quality and capacity, the pipe run between indoor and outdoor units, mounting complexity, and electrics. A straightforward back-to-back install (indoor unit on an external wall, outdoor unit directly behind) sits at the lower end; long pipe runs and awkward outdoor positions add labour.
Running costs
Cooling a single room typically costs pence per hour at today's rates, and heating via air-to-air is among the cheapest ways to heat one room — heat pumps move heat rather than generate it, so you get several kilowatts of heat per kilowatt of electricity.
Who's allowed to install it
Refrigerant work is legally restricted to F-Gas certified engineers. Always ask to see the certificate — a cheap install by someone unqualified is illegal, uninsurable and usually leaks.