How Much Does an Air Con Regas Cost?

Our air con regas starts from £50; here is what decides whether yours is at that figure or above it. The single biggest factor in what an air con regas costs is something most drivers have never heard of: which refrigerant gas the car uses. Cars type-approved from 2017 (and many from a few years earlier) use R1234yf, a low-global-warming gas that costs several times more per kilogram than the R134a used in older cars, and needs different equipment. So a regas on a 2014 Focus and a 2020 Focus are different jobs at different prices, and any garage quoting one flat figure for "a regas" is either guessing or only doing one type. Here is what else goes into it.

Norwich Tyres & Auto Service · 2 min read · Reviewed 18 September 2026

R134a or R1234yf: Check Before You Ring

There is usually a label under the bonnet, on the slam panel or near the compressor, stating the refrigerant type and the charge weight in grams. R134a is the older gas; R1234yf is the newer one, and the two are not interchangeable. Because R1234yf is mildly flammable and expensive, the recovery and charging machine is different, and the gas itself is the bulk of the cost of the regas. If you cannot find the label, the registration tells us.

What a Proper Regas Includes

1. Recovery of whatever old gas is left, weighed so we know how much had leaked.
2. Vacuum test: the system is pulled into a deep vacuum and held. If it will not hold, there is a leak and gassing it is pointless.
3. Recharge with the exact weight of new gas and the correct compressor oil, plus UV dye so any future leak can be found.
4. Performance check: vent temperatures and pressures measured to confirm it is actually cold.

A cheap "top-up" that skips the vacuum and just adds gas to whatever is in there is the regas that stops working in a month. Our how often to regas guide explains why systems lose gas over time even without a fault.

When a Regas Will Not Fix It

If the system would not hold vacuum, it has a leak, and the cost becomes a repair rather than a regas: a condenser holed by a stone at the front of the car, a perished O-ring, a corroded pipe or a compressor seal. If the compressor clutch does not engage, or the compressor has failed internally, that is a bigger job again. A blower that works but smells musty is usually the cabin filter or bacteria in the evaporator, fixed with a filter and an antibacterial clean, not gas. We diagnose before we quote so you are not paying for a regas the car cannot keep.

Why Prices Jump in Summer

Air con is a seasonal job. The first hot week in May or June every garage in Norwich is booked solid with warm-blowing cars, and some raise prices to match. Having the regas done in spring, before the heat, gets you a slot and means the leak test happens while there is still time to fix anything it finds. Air con also needs running through the winter to keep the seals lubricated, which is the cheapest maintenance there is.

Air Con at Ber Street

We service both R134a and R1234yf systems with the correct equipment, always with a vacuum test and UV dye, and quote before we start. Call 07933 900901 with the registration and we will tell you which gas the car uses and give you a price. Open seven days with free parking at 100-106 Ber Street; see the air con regas page for the full service.

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