Is R-410A Being Phased Out? What the 2026 EPA Rule Changed

R-410A is not banned for systems already in homes: the U.S. Environmental Protection Agency (EPA) says existing air conditioners and heat pumps can keep running and be repaired, including replacing a condensing unit or compressor. What is restricted is new equipment. Since January 1, 2025, new residential systems must use a refrigerant with a global warming potential (GWP) below 700, and an EPA rule effective July 27, 2026 allows an R-410A system to be installed only when every specified component in it was made in or imported into the United States before January 1, 2025.

The timeline in five dates

The rules changed several times in three years, so the date on anything you read about R-410A matters. The sequence, from EPA’s own account in the May 2026 rule:

1. October 24, 2023: EPA publishes its Technology Transitions rule under the American Innovation and Manufacturing (AIM) Act of 2020.
2. January 1, 2025: new residential and light commercial air conditioning and heat pump systems using refrigerants with a GWP of 700 or more are restricted.
3. January 1, 2026: the installation deadline an interim rule had set for equipment made or imported before 2025.
4. May 26, 2026: EPA publishes a final rule removing that installation deadline.
5. July 27, 2026: the final rule takes effect.

For scale, EPA’s GWP reference table lists R-410A at 2,088, R-32 at 675 and R-454B at 465. The 700 limit is what rules out R-410A in new equipment.

What the July 2026 rule actually says

The operative text is short. New residential and light commercial systems using a refrigerant with a GWP of 700 or more “may continue to be installed where all specified components of that system are manufactured or imported prior to January 1, 2025.”

Three details matter to a homeowner:

• All components, not just the outdoor unit. The exception depends on every specified component being made or imported before 2025.
• No end date. The rule text sets none. It is limited by how much qualifying equipment exists, not by a calendar.
• Variable refrigerant flow (VRF) systems are excluded from this provision.

EPA also explained how installers can tell the difference. Since January 1, 2025, specified components designed for refrigerants above the GWP limit must carry a label that reads “For servicing existing equipment only.” A part with that label is meant to repair an existing system, not to build a new one.

What stays the same for a system you already own

Nothing about the law requires replacing a working system. EPA’s frequently asked questions say the restrictions apply only to new products and systems, that there are no requirements to stop using equipment already in use, and that “you can continue to repair your existing refrigeration, air conditioning, and heat pump system. This includes replacing a major component like a condensing unit or compressor.”

EPA kept that option open in May 2026. The final rule made no change to the treatment of replacement condensing units, and EPA wrote that a homeowner can choose to replace a failed condensing unit rather than buy a whole new system.

What does change is supply. Under the AIM Act, HFC production and consumption allowances step down from 60% of the baseline in 2024 through 2028 to 30% in 2029 through 2033, 20% in 2034 and 2035, and 15% from 2036 on, according to EPA.

Who may buy and handle the refrigerant

Federal certification rules decide who works with it. EPA’s sales restriction page, updated March 23, 2026, limits the purchase of ozone-depleting refrigerants and their substitutes, such as R-410A, to technicians who hold Section 608 certification and to their employers, with narrow exceptions.

EPA also prohibits intentionally venting refrigerant while maintaining, servicing, repairing or disposing of air conditioning equipment. The charge in an old system has to be recovered, and EPA requires anyone who performs that kind of work to be certified under Section 608.

The new refrigerants: R-454B and R-32

New equipment has moved to A2L refrigerants: EPA’s May 2026 rule cites a distributors’ association report that A2L equipment reached 90% of market share by the end of the 2025 cooling season. EPA’s list of substitutes for residential air conditioning and heat pumps classes both R-454B and R-32 as A2L. Under ASHRAE Standard 34, the “A” means lower toxicity and “2L” means lower flammability; one condition of the 2L class is a maximum burning velocity of no more than 10 cm/s (3.9 in/s).

EPA listed R-454B, R-32 and several other A2L refrigerants as acceptable for new residential and light commercial air conditioners and heat pumps, subject to use conditions, in its 2021 Significant New Alternatives Policy (SNAP) rule.

The listing covers new equipment only, and EPA’s substitutes list marks both refrigerants that way. Nothing in it makes R-454B or R-32 a refill for an existing R-410A system.

Some states are stricter

A federal exception does not override a state rule. Three examples:

• New York. The Department of Environmental Conservation says in its Part 494 FAQ, updated May 2026, that changes to federal regulations are not automatically incorporated into the state rule, which uses January 1, 2026 for residential air conditioning. Requests go to the department directly, for example through its variance process.
• Washington. WAC 173-443-040 prohibits refrigerants with a GWP above 750 in new air conditioning equipment for residential and nonresidential use, with the effective date tied to the state’s adoption of an updated safety standard.
• California. The Air Resources Board lists refrigerants with a GWP of 750 or more as prohibited in new air conditioning equipment as of January 1, 2025.

If you live in one of these states, ask the installer to show how an R-410A proposal complies with the state rule, not only the federal one.

When a professional is needed, and what to ask

Any refrigerant work, from a leak repair to a new system, needs an EPA-certified technician. Start by reading the refrigerant type on the data plate of the outdoor unit, then ask:

• If you are proposing R-410A equipment for a new installation, when was each component made or imported? Can you show the manufacture dates or labels?
• Does any component carry the “For servicing existing equipment only” label? If so, is this a repair of my existing system or a new installation?
• Does my state have its own refrigerant rule that applies here?
• What EPA Section 608 certification do you hold, and how will you recover the refrigerant from the old equipment?
• If the system is low on refrigerant, where is the leak, and will it be repaired before recharging? EPA notes that system leaks harm the environment and raise operating and maintenance costs.