Air Conditioning Re-Gas Cost UK 2026
A home air conditioning re-gas costs around £100–£300 in the UK in 2026 — but only once the leak causing the loss has been found and repaired, which typically adds £120–£500 or more. A fixed split system is a sealed circuit: if it is low on refrigerant, it has a leak, so a genuine fix means find, repair, then recharge. This guide breaks down re-gas and leak-repair prices, explains the refrigerant types, and sets out the F-Gas rules every legitimate engineer must follow.
How much does it cost to re-gas air conditioning?
Recharging a home split system with refrigerant costs about £100–£300 on its own, depending on the gas type and how much the system holds. Because a sealed system only loses gas through a leak, a proper job also includes leak detection (£120–£300) and the repair itself (£150–£500+), so a full find-fix-recharge commonly lands at £250–£700 or more. Topping up a leaking system without fixing it wastes the gas and breaks the F-Gas regulations, and all refrigerant work must be carried out by an F-Gas certified engineer — this is a legal requirement. The way to control the cost is to catch leaks early through regular servicing and compare quotes on the same diagnosis.
| Job | What it covers | Indicative cost (2026) |
|---|---|---|
| Diagnostic call-out | Trace weak cooling or gas loss | £80–£150 |
| Leak detection | Pressure test and pinpoint the leak | £120–£300 |
| Leak repair | Re-flare, braze a joint or replace a valve | £150–£500+ |
| Re-gas / recharge (after leak fixed) | Evacuate the system and recharge by weight | £100–£300 |
| Full find-fix-recharge (typical) | Detection + repair + recharge together | £250–£700+ |
| Old R22 system | Obsolete gas — cannot be re-gassed, replace | Replace |
Indicative supplied-and-fitted prices including VAT for domestic and light-commercial split systems, based on UK engineer quote data gathered in 2026. Prices depend on refrigerant type, charge weight and how accessible the leak is. Car air conditioning is priced and regulated separately.
Where the money goes on a re-gas
A re-gas quote is rarely just the gas. The chart shows the typical parts of the job on a UK home or small-office split system — the recharge itself is often the smallest line once a leak has to be traced and repaired first.
Why your air conditioning needs re-gassing
The single most important thing to understand before you pay for a re-gas: a properly working home system should never need one as routine maintenance.
A fixed air conditioning system — a wall split, multi-split or ducted unit — runs on a sealed refrigerant circuit. Unlike a car, which is designed to lose a little gas over time, a home system does not use up refrigerant. So if yours is low and cooling weakly, it is not "due" a top-up — it has a leak somewhere in the pipework, joints or coils. That is why a trustworthy engineer treats a re-gas as a two-part job: find and repair the leak first, then recharge to the correct weight. Simply pumping gas into a leaking system loses it again within weeks, leaves you paying twice, and is against the F-Gas regulations. Common signs you are low on refrigerant include weak or warm airflow, ice or frost forming on the copper pipework or indoor coil, a hissing or bubbling noise, longer run times, rising electricity bills, or a low-pressure error code. To pinpoint where the gas is escaping, an engineer will pressure-test the sealed circuit with oxygen-free nitrogen and hunt the leak with an electronic sniffer, UV dye or a soap-bubble test at the flare joints and coil, so the repair that follows depends on what they find and a diagnosis always comes before any recharge price. If the unit is blowing warm rather than merely weak, our air conditioning not cooling guide covers the wider set of causes, and for a broader view of fault costs see our air conditioning repair cost guide.
Which gas your system uses — and whether it can be re-gassed
The refrigerant in your system is the biggest single factor in whether a re-gas is even possible, and how much the gas costs.
| Refrigerant | Found on | Can it be re-gassed? |
|---|---|---|
| R32 | Most systems installed from about 2018 | Yes — current standard |
| R410A | Systems roughly 2004–2018 | Yes, but the gas costs more |
| R22 | Older systems, pre-2004 | No — banned for servicing |
R22 has been banned for servicing use in the UK since 2015, so a leaking R22 system cannot legally be topped up and generally has to be replaced. R32 is today's standard and is mildly flammable, which is one more reason recharging is a job for a certified engineer, not a DIY kit. Refrigerant prices are also climbing through 2026 as the UK's F-Gas HFC quota tightens under DEFRA's phase-down, and the squeeze falls hardest on older, higher-global-warming gases such as R410A, so a recharge on an R410A system now costs noticeably more than the same job on R32.
If your unit turns out to run on R22, a re-gas is off the table and replacement is the sensible route — a new single split is typically £1,500–£3,000 supplied and fitted, with a fresh warranty and much lower running costs. Our installation hub covers new-system pricing, and the brands hub compares the main manufacturers, and our repair vs replace guide helps you decide when a failing unit is worth mending.
F-Gas rules and why DIY re-gassing is illegal
Refrigerant work is tightly regulated in the UK, for safety and environmental reasons. It is worth knowing the rules before anyone touches your system.
Under the F-Gas regulations, only an engineer holding a valid F-Gas certification may buy refrigerant or carry out a recharge, and it is illegal to deliberately release refrigerant to the atmosphere. It is also a regulatory offence to knowingly top up a system that has a leak without repairing it first. This is not box-ticking: refrigerants such as R32 and R410A are powerful greenhouse gases, and R32 is mildly flammable, so they must be recovered and handled by someone trained and properly equipped. In practice that means a DIY "top-up" can is both illegal and unsafe for a fixed home system. Every engineer we match you with is vetted and F-Gas certified, so any leak repair and recharge is done legally, safely and with the leak fixed first.
One common source of confusion: if you have seen re-gas prices around £50–£200, those are almost certainly for car air conditioning, which is designed to lose gas over time and is recharged differently. A fixed home or office split system is not the same — treat the home prices above, and the leak-first rule, as separate. Catching leaks early through an annual service is the cheapest way to avoid a big bill; see our servicing hub and running costs guide for how upkeep pays off.
Frequently asked questions
Sources & methodology
- Re-gas, leak-detection and leak-repair ranges compiled from UK air conditioning engineer quote data gathered during 2026 for domestic and light-commercial split systems.
- Refrigerant handling requirements reflect the F-Gas regulations, which require certified engineers, prohibit deliberate release of refrigerant, and forbid knowingly topping up a leaking system.
- R22 is banned for servicing use in the UK; replacement reference prices use typical UK single-split installation costs.
- Prices are indicative and include VAT — they are not quotations. Your cost depends on an on-site diagnosis. Car air conditioning is not covered here.
Get accurate re-gas and leak-repair prices
Air Con Surrey is a free matching service. Tell us your unit's make and symptoms and we'll match you with vetted, F-Gas certified engineers who trace the leak, repair it and recharge your system correctly — so you compare real prices, not guesses.