An air con regas costs £60 to £90 for most UK cars. Older vehicles using R134a gas sit at the lower end; cars from around 2017 onwards use R1234yf, which is considerably more expensive and can push the price to £200.
| Vehicle type | Typical range | What affects it |
|---|---|---|
| R134a system (most pre-2014 cars) | £60–£90 | Cheaper, widely available gas |
| R1234yf system (most post-2017 cars) | £100–£200 | Substantially dearer refrigerant |
| Regas with antibacterial clean | £90–£150 | Two separate services bundled |
| Leak detection and repair | £100–£400 | Where the system will not hold gas |
Written by Chris Fisher, founder of Clarity-GMS and a working independent garage owner.
Air conditioning quietly loses efficiency every year — around 10% of its gas annually is normal — so most cars need a regas every couple of years. The price depends almost entirely on one thing: which gas your car uses.
R134a is fitted to most cars built before roughly 2014. It is inexpensive, and a regas on an R134a system typically costs £60 to £90.
R1234yf is the more environmentally friendly replacement, phased in from 2011 and mandatory on all new vehicles sold from 2017. It is substantially more expensive as a raw material, and a regas can run £100 to £200.
The two are not interchangeable. The systems use different fittings and different equipment, and a garage cannot substitute one for the other. If you are ringing round for prices, say which gas your car takes — otherwise you will be quoted for R134a and surprised at the counter.
It is not simply topping up. A proper service evacuates the remaining refrigerant, applies a vacuum to remove moisture and check the system holds pressure, then recharges with the correct weight of gas and fresh lubricating oil.
The vacuum stage matters. Moisture in an air conditioning system forms acids that corrode components from the inside, and a system that will not hold vacuum has a leak that a regas alone will not solve.
Air conditioning is a sealed system. Gradual loss is normal, but if performance drops within weeks or months of a regas, there is a leak.
Common culprits are perished O-rings, a corroded condenser at the front of the car where it catches road salt and stone chips, or a failing compressor seal. Most garages will add UV dye during a regas so a leak can be traced later.
Repeatedly regassing a leaking system wastes money and vents refrigerant, which is both an environmental problem and, for professionals, a regulated one.
The most common cause of expensive air conditioning failure is not using it.
The compressor is lubricated by oil circulating with the refrigerant. Leave the system off for six months and seals dry out and crack, which is how a £70 regas becomes a £400 compressor job.
Run the air conditioning for ten minutes or so every couple of weeks year-round. It also demists the windscreen faster than heat alone, so winter use is genuinely useful rather than merely maintenance — worth remembering at your next service.
These get bundled together and are different things. A regas restores cooling performance. An antibacterial treatment deals with the musty smell that comes from bacteria in the evaporator and ducting.
If your air conditioning blows cold but smells unpleasant, you need the clean, not the regas. Being clear about the symptom saves paying for the wrong service.
Guide prices only. Actual cost varies by vehicle, refrigerant type and local labour rates. Get free quotes from vetted local garages through Fix My Motor — compare and book without ringing around yourself.Air conditioning quietly loses efficiency every year — around 10% of its gas annually is normal — so most cars need a regas every couple of years. The price depends almost entirely on one thing: which gas your car uses.
R134a is fitted to most cars built before roughly 2014. It is inexpensive, and a regas on an R134a system typically costs £60 to £90.
R1234yf is the more environmentally friendly replacement, phased in from 2011 and mandatory on all new vehicles sold from 2017. It is substantially more expensive as a raw material, and a regas can run £100 to £200.
The two are not interchangeable. The systems use different fittings and different equipment, and a garage cannot substitute one for the other. If you are ringing round for prices, say which gas your car takes — otherwise you will be quoted for R134a and surprised at the counter.
It is not simply topping up. A proper service evacuates the remaining refrigerant, applies a vacuum to remove moisture and check the system holds pressure, then recharges with the correct weight of gas and fresh lubricating oil.
The vacuum stage matters. Moisture in an air conditioning system forms acids that corrode components from the inside, and a system that will not hold vacuum has a leak that a regas alone will not solve.
Air conditioning is a sealed system. Gradual loss is normal, but if performance drops within weeks or months of a regas, there is a leak.
Common culprits are perished O-rings, a corroded condenser at the front of the car where it catches road salt and stone chips, or a failing compressor seal. Most garages will add UV dye during a regas so a leak can be traced later.
Repeatedly regassing a leaking system wastes money and vents refrigerant, which is both an environmental problem and, for professionals, a regulated one.
The most common cause of expensive air conditioning failure is not using it.
The compressor is lubricated by oil circulating with the refrigerant. Leave the system off for six months and seals dry out and crack, which is how a £70 regas becomes a £400 compressor job.
Run the air conditioning for ten minutes or so every couple of weeks year-round. It also demists the windscreen faster than heat alone, so winter use is genuinely useful rather than merely maintenance — worth remembering at your next service.
These get bundled together and are different things. A regas restores cooling performance. An antibacterial treatment deals with the musty smell that comes from bacteria in the evaporator and ducting.
If your air conditioning blows cold but smells unpleasant, you need the clean, not the regas. Being clear about the symptom saves paying for the wrong service.
Guide prices only. Actual cost varies by vehicle, refrigerant type and local labour rates. Get real quotes from local garages for your car.
Last reviewed: 2026-07-30
Most systems lose around 10% of their gas each year, so a regas every two years is typical. If cooling performance has dropped noticeably, it is due.
Almost certainly gas type. Cars from around 2017 use R1234yf, which is far more expensive than the older R134a. The two are not interchangeable. Check which your car takes before comparing prices.
There is a leak. Air conditioning is a sealed system, so anything beyond gradual annual loss means gas is escaping — commonly a perished O-ring, corroded condenser or compressor seal. Repeatedly regassing without finding the leak wastes money.
Yes. The compressor is lubricated by oil circulating with the refrigerant, and leaving the system unused causes seals to dry out and crack. Run it for ten minutes every couple of weeks. It also demists the windscreen faster.
A regas restores cooling performance. An antibacterial treatment removes the musty smell caused by bacteria in the evaporator. If your air con blows cold but smells bad, you need the clean, not the regas.