A hydrofluorocarbon (HFC) refrigerant used in residential and commercial air conditioning systems from the late 1990s through 2025. R-410A replaced R-22 because it doesn’t deplete the ozone layer and runs more efficiently. It operates at higher pressures than R-22, so systems are purpose-built for it — you can’t mix refrigerants or swap components between R-22 and R-410A systems.
R-410A and the AIM Act Phase-Down
R-410A has a global warming potential (GWP) of 2,088 — roughly 2,000 times more heat-trapping than carbon dioxide. The American Innovation and Manufacturing (AIM) Act of 2020 authorized the EPA to phase down HFCs including R-410A. New residential AC equipment in the U.S. can no longer use R-410A as of January 1, 2025. Existing systems can still be serviced with R-410A from existing inventory, but new equipment now ships with lower-GWP alternatives.
What Replaces R-410A
The main replacements are:
- R-32 — GWP of 675, mildly flammable (A2L class), used in Daikin and Mitsubishi systems
- R-454B — GWP of 466, A2L, used in Carrier Puron Advance and Lennox systems
- R-466A — GWP of 733, non-flammable (A1 class), developed by Honeywell
The A2L designation (mildly flammable) has caused installer concern, but these refrigerants require ignition energy far above what normal residential environments produce. Updated building codes address installation requirements for A2L systems.
What This Means for Tampa Homeowners
If you have an R-410A system installed before 2025, it can still be serviced and recharged — supply exists and will for years. There’s no reason to replace a functioning system just because of the phase-down. But when it’s time for a new unit, you’ll be getting a next-gen refrigerant system. Hot 2 Cold Air Conditioning installs and services all current refrigerant platforms in the Tampa Bay area. Call (813) 999-8888 for refrigerant questions or new system quotes.