What does the R-410A phase-out mean for your air conditioner?

If you own an air conditioner or heat pump that uses R-410A refrigerant, you can keep using and repairing it. R-410A is one of the legacy hydrofluorocarbons, or HFCs, that the U.S. Environmental Protection Agency (EPA) is phasing down. EPA's frequent questions on the HFC phasedown say, "Homeowners can maintain and repair their systems throughout the useful life of the equipment." The rules mainly change which refrigerants a new system can use.

What the EPA rule limits

EPA's Technology Transitions rule caps the global warming potential, or GWP, of refrigerants in new equipment. EPA's sector table sets a GWP limit of 700 for residential and light commercial AC and heat pump systems. The installation compliance date is January 1, 2025. The same row exempts systems if all specified components were made or imported before that date.

EPA's SNAP list of approved substitutes gives R-410A a GWP of 2,090, about three times the 700 cap.

A footnote in EPA's sector table shows that the rule targets new installations, not repairs. It says: "EPA is restricting the installation of new field-assembled systems. Components used to repair existing systems are not subject to these restrictions." Self-contained products include window units and portable room air conditioners. They have the same 700 limit if they were made or imported starting January 1, 2025.

What EPA's May 2026 refrigerant rule changed

EPA's May 2026 fact sheet explains what the 2026 rule changed. It says the rule "Removes the January 1, 2026, installation compliance date for equipment using refrigerants above the 700 limit that were domestically manufactured or imported into the United States before January 1, 2025." EPA says this lets AC systems made or imported before 2025 "continue to be installed."

The final rule appeared in the Federal Register on May 26, 2026. It states, "This final rule is effective on July 27, 2026."

If you already own an R-410A system

EPA's FAQ describes your repair options: "A homeowner can replace a faulty component (e.g., condensing unit, indoor coil, other smaller parts) with a similar R-410A component." In the 2026 final rule, EPA confirmed that "a homeowner can choose to replace their failed condensing unit rather than purchase a whole new system."

EPA's FAQ also describes a limit: "A new system would also be installed if both the condensing unit and indoor coil are replaced together." You can still spread repairs out over time. EPA says, "Systems may be repaired over time," and it lists three things to weigh: "availability of components, energy efficiency, and total maintenance costs."

The final rule sets a label rule for specified components built for a refrigerant above the limit. It says that after January 1, 2025, these components "must have a label that states 'For servicing existing equipment only.'" A part with that label is meant to repair an existing system.

Will R-410A refrigerant still be available?

In the final rule, EPA repeats that "HFCs will continue to be available including to service existing equipment." Homeowners cannot buy it on their own. Under EPA's sales restriction, "Only Section 608 certified technicians can purchase refrigerants intended for use with stationary refrigeration and air-conditioning equipment."

EPA's FAQ shows supply shrinking in steps. Caps on production and consumption are 60 percent of the historic baseline for 2024 through 2028. They drop to 30 percent for 2029 through 2033. EPA says it is phasing HFCs down "to 15% of their historic baseline levels in a stepwise manner by 2036." In the final rule, EPA acknowledges that "the 2029 phasedown step will decrease production and import of HFCs."

On price, EPA says "the price of refrigerant using legacy HFCs may rise as the phasedown continues," but it gives no number. According to ACHR News, a trade publication, two groups argued that delaying deadlines for supermarket refrigeration equipment could raise refrigerant costs, including for homes. The groups are the Air-Conditioning, Heating, and Refrigeration Institute (AHRI), the industry's trade association, and the Alliance for Responsible Atmospheric Policy. AHRI president Stephen Yurek said that "refrigerant prices are likely to rise." Both groups are suing over the rule. We do not publish a price per pound because we found no government or standards-body source for one.

What new systems use instead of R-410A

EPA's SNAP list includes several refrigerants under the 700 limit for new residential AC and heat pumps. Two of them are:

• R-454B: GWP 470, safety class A2L, "Acceptable with Use Conditions"
• R-32 (HFC-32): GWP 675, safety class A2L, "Acceptable with Use Conditions"

EPA describes A2L refrigerants as "lower flammability," so they come with safety rules. EPA's SNAP questions and answers say its A2L listings in SNAP Rules 23 and 25 "require compliance with UL Standard 60335-2-40 Edition 3." EPA also says that following ASHRAE Standard 15 "will ensure the safety of technicians and building occupants." ASHRAE says its Standard 15.2 "is designed to accommodate the use of A2L-classified refrigerants in residential applications."

Court challenges to the 2026 rule

On July 21, 2026, 18 states asked a federal appeals court to review the May 2026 rule. The District of Columbia and New York City joined them, and the states include Washington. The petition was filed in the U.S. Court of Appeals for the D.C. Circuit. ACHR News reported that AHRI and the Alliance filed their own petition in late June 2026. They argue EPA skipped a required economic analysis and the one-year compliance lead time.

We have not confirmed the status of these court cases. Efficiency ratings also matter when you choose a new system, and our guide to SEER2 ratings and regional minimums explains them.