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 covers more than you would think. Any component of an R-410A system, including a complete indoor or complete outdoor unit, can be replaced. Three things turn that into a new system installation, and then A2L equipment is required: assembling a system from scratch, increasing the cooling capacity in BTU per hour, or replacing 75% or more of the evaporators together with all of the condensers and compressor racks.
New R-410A units are still built for that purpose. They are labelled “For Service Only” and must meet the Outdoor Unit With No Match test procedure. Carrier also says it will keep manufacturing R-410A indoor coil components for coil replacements.
California went further, and possibly Washington. California prohibits new air conditioning and heat pump equipment at or above a GWP of 750 from 1 January 2025. Its rule does not say, in what this site has read, whether a replacement outdoor unit for an existing system is caught by that — so a Californian should not assume the service route above survives, and should ask which rule the installer is working to. Washington is reported to have a comparable restriction, but this site has not read Washington’s own rule and will not state it as a fact.
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.
In force Servicing an R-410A system is allowed; rebuilding one is not. The rule does not restrict the continued use of any existing system. A system may be serviced and repaired throughout its useful life, including by replacing components, and the components needed to do that may still be manufactured, imported, sold, distributed and exported. What is restricted is installing a new system. Three actions count as installing one, once the system is charged to full charge: assembling a system for the first time from new or used components; increasing the cooling capacity in BTU per hour of an existing system; or replacing 75 percent or more of the evaporators by number together with all of the compressor racks, condensers and connected evaporator loads. This is the rule that decides whether swapping one box is service or is a new system.
In force New R-410A outdoor units are sold labelled "For Service Only". New R-410A condensing units are still built and sold for use in existing systems, because the federal rule exempts components from its manufacturing and sale prohibitions. Units sold for that purpose are labelled "For Service Only", which the Carrier Enterprise transition guide attributes to the Department of Energy's efficiency requirements and its Outdoor Unit With No Match test procedure. That attribution is the distributor's, not one this site has read in a Department of Energy document, so treat the reason for the label as reported rather than verified — the label itself is on the equipment and the route is real.
In force California caps new air conditioning equipment below the federal limit. California prohibits new air conditioning and heat pump equipment using a refrigerant with a global warming potential of 750 or greater from 1 January 2025, under the Air Resources Board's rule at 17 CCR 95374. That is stricter than the federal limit of 700 in the sense that it bites on equipment rather than on installation, and R-410A is far above both. The board's own page does not say whether a replacement condensing unit for an existing system is caught by it, so a Californian should not assume the federal service route survives here — ask the installer to show which rule they are working to. Washington is reported to have a comparable restriction; this site has not read Washington's own rule, so that is a question rather than a fact.
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.