Short answer: R32 is the standard refrigerant in most new UK split systems: it has about a third of the global warming potential of R410A and works efficiently. R410A systems can still be serviced but new single splits using it can no longer be placed on the GB market, and R22 systems cannot be recharged at all, so a leak usually means replacement.
How to find your refrigerant
Look at the rating plate on the outdoor unit. It lists the refrigerant type and the factory charge in kilograms.
R32
A single-component refrigerant with a GWP around 675. It is mildly flammable (class A2L), so installers follow specific rules on charge size and room size, which they build into the design.
R410A
Common in systems from roughly the mid-2000s to around 2020. It works well but has a GWP around 2,088. Existing systems can be serviced and repaired; supplies are reducing under the HFC phase-down.
R22
The old standard, phased out years ago. It can no longer be used to recharge systems, so any significant leak ends an R22 system's life. If you have one, plan its replacement.
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- Multi-split or separate single systems?
Reviewed October 2026. Rules and prices change; check the date and ask us if anything is unclear.