Guide
R-410A to R-454B: what the refrigerant change means for your quote
Updated
The industry changed refrigerant under your feet, and it changes the repair-or-replace decision more than any efficiency rating does. Here is what is actually in force.
The rule, in plain terms
Under the American Innovation and Manufacturing Act, EPA's Technology Transitions program restricts high global warming potential HFCs by sector. For residential and light commercial air conditioning and heat pumps, the limit is 700 GWP. The compliance date for manufacture and import is January 1, 2025 (EPA, HFC restrictions by sector).
R-410A sits above that limit, which is why new equipment now ships with R-454B or R-32.
The installation side has moved twice
- The original rule set an installation compliance date of January 1, 2025, but did not apply it to systems where all specified components were manufactured or imported before that date.
- A December 2023 interim final rule let inventory of higher-GWP equipment manufactured or imported before January 1, 2025 be installed until January 1, 2026 (EPA regulatory actions).
- In May 2026 EPA finalized a reconsideration rule that, in EPA's own words, "allows for the tens, if not hundreds, of thousands of residential or light commercial AC systems, that were domestically manufactured or imported into the U.S. before January 1, 2025, to continue to be installed" (EPA fact sheet, May 2026).
That sequence is why you may still be offered an R-410A system in 2026. It is not necessarily a scam: it may be legitimate pre-2025 stock. But you are entitled to know which you are being sold, and to price it against a new-refrigerant system.
This area has changed three times in three years. Treat any date you read anywhere, including here, as something to re-check against epa.gov before you sign.
Can my existing R-410A system still be serviced?
Yes. EPA's restrictions target new products and new system installation. EPA's own sector table carries the footnote that "components used to repair existing systems are not subject to these restrictions". Your installed R-410A system is legal, serviceable and not obliged to be ripped out.
Over time, expect R-410A service refrigerant to become less of a bargain as the wider HFC phasedown continues. That is a budgeting consideration, not a deadline.
What this changes about repair versus replace
- Mixed-refrigerant repairs do not work. You cannot put an R-454B outdoor unit against an R-410A indoor coil. A condenser failure on an older split system is often really a system decision.
- Match the coil. If a quote replaces only the outdoor unit, ask in writing whether the indoor coil is being replaced and why, or why not.
- R-454B and R-32 are mildly flammable (A2L). That is normal for this generation of refrigerant, it drives equipment design, leak detection and handling practice, and it is a reason to insist on a properly certified installer rather than a cash-in-hand one.
- Certification is not optional. Technicians working on refrigerant circuits need EPA Section 608 certification (epa.gov), and venting refrigerant while servicing, maintaining, repairing or disposing of equipment is prohibited.
Three questions that expose a weak quote
- Which refrigerant does this system use?
- The answer should be immediate and in writing on the proposal, along with the model numbers.
- Is this new stock or pre-2025 inventory?
- Both can be legal. Only one of them should be priced like a current system.
- Is the indoor coil being replaced too?
- If not, ask how the contractor is matching an existing coil to a new-refrigerant outdoor unit. There should be a clear technical answer.