R32 vs R410A: What You Need to Know

What is a refrigerant?

A refrigerant is the working fluid inside an air conditioning system. It absorbs heat from the indoor air and releases it outside by cycling between liquid and gas states. The refrigerant never gets used up — it circulates continuously. What changes is the pressure and temperature at each stage of the cycle.

When a system needs to be regassed, it means refrigerant has leaked due to a fault — not that the refrigerant was consumed. Finding and fixing the leak is part of a proper regas procedure.

R410A

R410A was the dominant refrigerant in air conditioners sold from the late 1990s through to the mid-2010s. It replaced older refrigerants that damaged the ozone layer. R410A does not deplete the ozone layer, but it does have a relatively high Global Warming Potential (GWP) of around 2088.

R410A operates at higher pressures than some other refrigerants, which influenced compressor and component design in systems built for it. These systems must not be charged with R32 — the refrigerants are not compatible.

R32

R32 has a GWP of 675 — about one third of R410A. It also has better thermodynamic properties, which means a unit using R32 can deliver the same cooling capacity with less refrigerant by mass. This reduces the cost of any regas and lowers the overall environmental impact of a leak.

R32 is mildly flammable (A2L classification). This requires specific safety considerations during installation, servicing, and disposal — your technician must be familiar with the handling requirements.

• ✓ R32 requires A2L-rated tools and handling procedures
• ✓ Room ventilation requirements apply during servicing
• ✓ Do not attempt to service R32 systems without the correct training and equipment

Which refrigerant is in your unit?

The refrigerant type is printed on the outdoor unit's data plate. It will state R32, R410A, or another type. Never mix refrigerants. If you are unsure, ask your technician to check before any servicing work begins.

New split air conditioners brought to market in South Africa are increasingly R32. R410A units are still being serviced and are expected to remain in use for many years.

What does this mean for you?

If you are buying a new unit, R32 is the direction the industry has moved and is a reasonable choice for most applications. If you already have an R410A system in good condition, there is no urgency to replace it — keep it serviced and it will continue to work reliably.