The R-410A Phase-Out, for People Who Just Own an Air Conditioner
Which deadlines are real, which one was lifted, what you can still buy, and what none of it changes about your existing system. Six rules, each dated.
Most of what is written about this transition is written for contractors. Here is the version for somebody who owns an air conditioner and would like to know whether they need to worry.
The short version
Your system is fine. Nothing here requires you to remove, replace or stop using working R-410A equipment. Every rule below is about what may be made, imported or installed — none of them is about what may keep running.
The rules, in the order they hit you
A cap, not a ban. The final ruling sets the maximum global warming potential for residential and light commercial air conditioning and heat pumps at 700. R-410A is far above that. That single number is the cause of everything else: the refrigerant was not banned, the equipment simply had to change.
Whole new R-410A systems stopped; parts did not. From 1 January 2025 a new residential split system may not be installed on a refrigerant above the limit, and self-contained products like window units may not be made. Components are expressly exempt: new R-410A condensing units, coils and compressors may still be built and sold for existing systems. That exemption is why the service route below exists at all.
The installation deadline was removed. An interim rule had extended installation of pre-2025 equipment to 1 January 2026. In a final rule published on 26 May 2026 and effective on 27 July 2026 the EPA removed the deadline altogether, so remaining stock can be installed until it runs out. If a contractor tells you an R-410A system is illegal to install, that has not been true since that rule took effect.
Servicing is still allowed, and it reaches further than most people expect. It covers a complete outdoor unit, not only small parts, and new R-410A units are still built for exactly that. Where the line sits — the three things that turn a repair into a new system installation — is the subject of its own page, because it is the question that decides most quotes.
Everything above is federal, and two states do not follow it. California and Washington write their own definitions, and under both of them replacing the outdoor unit alone is not servicing. That exception, its wording and each state’s dates are on the outdoor-unit page.
What it costs you, practically
The transition reaches your wallet in one place: the day your outdoor unit needs replacing. At that point you choose between a service replacement that keeps your existing coil, and an A2L system that does not — because an A2L outdoor unit requires a matching indoor coil.
That is the whole decision, and it is the one this site is built around. The three-question check gives you your manufacturer’s answer for each part of what you already own.
What is not true
- “You have to replace your system by 2026.” No.
- “R-410A is banned.” Manufacture ended; use and service did not.
- “R-410A refrigerant will be unobtainable.” Reclaimed and existing stock continue to serve existing equipment. Prices are a fair worry; availability in the near term is a different claim.
- “You can just put the new refrigerant in.” The one thing on this page that is genuinely not allowed. R-454B is not a drop-in for R-410A.
Questions people ask
Is my R-410A system now illegal?
No. Nothing requires you to remove or replace a working system. The rules govern what may be manufactured, imported and installed, not what may keep running in your house.
Can I still get R-410A refrigerant for a repair?
Yes. Servicing existing R-410A equipment remains allowed, and the rule expressly exempts components from its manufacturing and sale prohibitions — so refrigerant, coils, compressors and complete outdoor units may still be made and sold for existing systems. What ended is the new R-410A system.
Do I have to replace my whole system if the outdoor unit dies?
Not necessarily. Replacing a complete outdoor unit counts as servicing rather than a new system installation, unless you are also increasing capacity or replacing most of the rest of the system. The EPA confirmed this again in May 2026, declining petitions that would have made a condensing unit replacement count as a new system.
The rules this rests on
In force New residential systems are capped at a refrigerant GWP of 700. The EPA's Technology Transitions rule sets 700 as the global warming potential limit for the residential and light commercial air conditioning and heat pump subsector. From 1 January 2025 a new system in that subsector may not be installed using a refrigerant at or above that limit. Variable refrigerant flow systems are excepted from this paragraph and carry their own later dates. R-410A is far above 700, which is why the equipment changed rather than the refrigerant being reformulated.
In force What stopped on 1 January 2025, and what did not. From 1 January 2025 the rule restricts self-contained residential products — window and portable air conditioners and similar — that use a refrigerant at or above a GWP of 700, and it restricts the installation of new split systems that do. It does not restrict components: the exemptions section states that the prohibitions on manufacturing, importing, selling, distributing or exporting products do not apply to components using a regulated substance. New R-410A condensing units, coils and compressors may therefore still be built and sold for existing systems. R-410A split systems left the market because a new one may not be installed, not because every part became unlawful to make.
Superseded The one-year extension for installing pre-2025 equipment. An interim final rule published on 26 December 2023 extended the installation compliance date for this subsector by one year, to 1 January 2026, for systems in which every specified component was manufactured in the United States or imported into it before 1 January 2025. The EPA's stated reason was stranded inventory in new construction, where equipment is ordered long before it is fitted. That deadline was later removed altogether.
In force The EPA removed the deadline for installing pre-2025 R-410A equipment. In a final rule published on 26 May 2026 and effective on 27 July 2026, the EPA removed the installation deadline for residential and light commercial systems built from equipment manufactured in the United States or imported into it before 1 January 2025. The amended paragraph now says such systems may continue to be installed, with no end date. This changes what an installer may fit; it does not change what a manufacturer approves as a system, which is a separate question and the one this site answers.
Sources
- Carrier Enterprise — 2025 Carrier Equipment Transition Guide — A2L Refrigerant Ready . Read 2026-09-01.
- US Environmental Protection Agency — Phasedown of Hydrofluorocarbons: Restrictions on the Use of Certain Hydrofluorocarbons Under the American Innovation and Manufacturing Act of 2020 . Read 2026-09-02.
- US Environmental Protection Agency — Phasedown of Hydrofluorocarbons: Technology Transitions Program Residential and Light Commercial Air Conditioning and Heat Pump Subsector . Read 2026-09-02.
- US Environmental Protection Agency — Phasedown of Hydrofluorocarbons: Reconsideration of Certain Regulatory Requirements Promulgated Under the Technology Transitions Provisions of the American Innovation and Manufacturing Act of 2020 . Read 2026-09-02.
This is a starting point, not an approval. Everything here is read from published manufacturer documents and dated, but only the licensed contractor who signs your installation can approve a specific system for your home and your local code. Take the citations on this page to them and ask.