Air Conditioning Installation UK 2026 — Free Quotes from F-Gas Engineers

UK air conditioning installation Q2 2026: single-room split £1,500-3,000, multi-split (3-4 rooms) £3,500-7,000, ducted/whole-home £6,000-20,000. Portable units £200-500 (no install). All fitted by F-Gas registered engineers. London + South-East +20-30%. See our full cost guide for brand-by-brand pricing.

Yes — it's a legal requirement. Any engineer handling fluorinated refrigerant gases (which all split + multi-split systems use) must hold F-Gas certification, and the business should be REFCOM-registered. Using a non-certified installer is illegal, voids the manufacturer warranty, and risks dangerous refrigerant leaks. Every installer we match is F-Gas registered.

Yes — most modern UK split systems are air-to-air heat pumps that both cool in summer and heat in winter. In heating mode they're often cheaper to run than gas central heating for individual rooms (delivering ~3-4kW of heat per 1kW of electricity). Mitsubishi's Hyper Heating + Daikin units maintain efficiency down to -15°C, making them a genuine year-round comfort solution.

Usually no for the indoor units. The outdoor condenser is Permitted Development in most cases if it's not on a wall facing a road, is below 0.6m³ in volume, sits at least 1m from the boundary, and the property isn't listed or in a conservation area. Flats, listed buildings + conservation areas typically need planning. See our air conditioning planning permission guide.

A single-room split system takes about a day to install. A multi-split (3-4 rooms) takes 2-3 days. Ducted + VRF systems take 3-7 days depending on coverage. From your first enquiry through survey to install is typically 1-3 weeks. The installer fits the indoor + outdoor units, runs the refrigerant pipework, installs a condensate drain + commissions the system before handover.