Air Conditioning Cost Calculator UK
Estimate the 2026 cost of installing air conditioning in your home — by system type and region. Supply-and-fit figures from F-Gas / REFCOM-registered installers, with a realistic low–mid–high range. No email required.
Estimate Your Air Conditioning Cost
Pick your system and region for an instant 2026 fitted-price estimate from F-Gas registered installers.
How This Calculator Works
This calculator combines your system type with real 2026 UK supply-and-fit pricing from F-Gas / REFCOM-registered installers, then applies a regional labour multiplier.
System Prices (supply + fit)
- 1 room — single split ~£2,000 (2.5–3.5kW wall unit)
- 1 large / open-plan room ~£2,800 (5kW unit)
- 2–3 rooms — multi-split ~£5,000 (one outdoor unit)
- 4+ rooms — multi-split ~£7,000
- Whole home — ducted / VRF ~£12,000
Includes indoor unit(s), outdoor condenser, standard pipe run and commissioning by an F-Gas registered engineer.
Regional Multipliers
- London 1.25× · South East 1.12×
- Midlands & East 1.00× (baseline)
- South West & Wales 0.95×
- North & Scotland 0.90×
Low/high reflect a ±15% spread around the mid estimate. A real quote follows a site survey.
What Changes an Air Conditioning Quote
The unit and system type set the baseline, but the on-site work is where two quotes for the same rooms diverge. The biggest swing factors are the pipe-run length between each indoor head and the outdoor condenser, whether that condenser sits at ground level or needs a first-floor bracket or roof mount, brick versus stud-wall penetrations, and any consumer-unit or dedicated-circuit electrical work. A short, tidy run to a nearby ground-level condenser sits at the low end of each cost band; a long concealed run that needs scaffolding pushes you toward the high end.
Running cost matters as much as the fitted price. A modern A+++ split runs as an air-to-air heat pump with a seasonal efficiency far above a plug-in cooler, so sizing the unit correctly to the room avoids paying to run capacity you never use. See our air conditioning running costs guide for typical pence-per-hour figures, or compare air conditioning against a heat pump if you also want efficient winter heating from the same system.
Any install that adds, tops up or moves refrigerant must legally be carried out by an F-Gas certified company in the UK — it is a legal requirement, not a preference, and using an uncertified fitter can void your warranty. Confirm your installer holds a valid company certificate (for example through REFCOM F-Gas guidance) and check whether your external unit falls under permitted development or needs planning permission before any work begins.
Typical Home Air Conditioning Costs (2026)
Supply & fit by an F-Gas/REFCOM engineer, Midlands baseline (±15%).
| System | Typical spec | Cost range |
|---|---|---|
| Single split — 1 room | 2.5–3.5kW wall unit | £1,700–£2,300 |
| Large / open-plan room | 5kW unit | £2,380–£3,220 |
| Multi-split — 2–3 rooms | 1 outdoor + 2–3 heads | £4,250–£5,750 |
| Multi-split — 4+ rooms | Larger multi-split | £5,950–£8,050 |
| Ducted / VRF — whole home | Concealed ducted system | £10,200–£13,800 |
These figures power the calculator above — enter your own spec for a tailored estimate. For the full breakdown, read our complete cost guide.
Frequently Asked Questions
How much does air conditioning cost to install in 2026?
Does the price include fitting?
Does air conditioning also heat in winter?
Do I need planning permission?
Why must the installer be F-Gas registered?
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What is included in the estimate and what is not?
Why might my air conditioning quote differ after a survey?
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