The R-410A Install Deadline That Got Reversed

The short version

The rule gave the industry one year. From January 1, 2025, no one could manufacture or import R-410A residential or light commercial products, or components destined for new systems. Installing those systems had to stop after January 1, 2026, even if the equipment was built years earlier. The installation half of that is gone. The Environmental Protection Agency (EPA) wrote that rule. Its limits are set by global warming potential (GWP), a refrigerant’s warming effect measured against carbon dioxide. On May 21, 2026, the EPA announced final changes to its Technology Transitions rule, published in the Federal Register on May 26, that remove the installation deadline for residential and light commercial air conditioners and heat pumps using refrigerants above 700 GWP, as long as every specified component was manufactured or imported before January 1, 2025. Pre-2025 inventory can now be installed until it runs out. The manufacture ban did not move, the hydrofluorocarbon (HFC) phasedown did not move, and at least one state, New York, kept the old deadline in force under its own regulation. The customer angle is worth saying out loud. The equipment is federally legal to install when its component dates qualify. The refrigerant it will be serviced with comes from under a shrinking federal cap on HFC production overall, and the industry’s own trade groups expect its price to rise. An R-410A install in 2026 is a purchase whose service costs are pointed up.

What the 2023 rule ordered

The Technology Transitions rule, issued under the American Innovation and Manufacturing (AIM) Act in October 2023, prohibited manufacturing or importing products and system components using refrigerants above 700 GWP for use in new residential and light commercial systems from January 1, 2025, and originally put the installation cutoff at that same date. A December 2023 interim final rule moved installation out to January 1, 2026, in answer to the concern that a single date would strand equipment already built. R-410A, with a GWP over 2,000, was well above that limit, which is why 2025’s new equipment ran on R-454B and R-32.

That one-year gap became the sell-through window: a year to install the R-410A equipment already built. Then the transition hit supply problems the window had no room for.

How the deadline came apart

In 2025 the A2L rollout ran into supply problems. The International Code Council (ICC) update that fall described a shortage of R-454B refrigerant and, more importantly by its account, a shortage of the cylinders to transport A2Ls in, holding up installations of the new equipment the rule required. The EPA’s own account in the final rule runs a little differently: bulk R-454B supply was enough, and the scarcity came from getting the refrigerant into service cylinders and into technicians’ hands, region by region. Either way installations stalled. As the installation cutoff approached, the same ICC update described contractors looking at equivalent HFC systems, meaning R-410A, where the rules still allowed it.

Distributors were carrying the other half of the problem. Heating, Air-conditioning and Refrigeration Distributors International (HARDI), the distributors’ association, put its members’ exposure on remaining R-410A inventory at more than $500 million if the deadline stayed in force. When the EPA proposed reconsidering the rule, including removing the installation cutoff for equipment manufactured before 2025, the industry filed more than 2,300 comments.

The agency moved in two steps. In the last week of December 2025, days before the deadline, the EPA announced it would deprioritize enforcement of the installation ban while the reconsideration ran, stating that the current deadlines remained legally in effect but that enforcing them was a low priority. The Air Conditioning Contractors of America (ACCA) noted at the time that the relief did not extend to R-410A variable refrigerant flow (VRF) and variable refrigerant volume (VRV) systems, which ran on their own schedule. Then came the final rule.

What the May 2026 rule actually changed

On May 21, 2026, the EPA announced the finalized reconsideration, and the rule was published in the Federal Register on May 26. For residential and light commercial air conditioning and heat pumps, the January 1, 2026 installation deadline is removed for systems whose specified components were manufactured or imported before January 1, 2025. Contractors and distributors can install that inventory until it is gone. The rule took effect July 27, 2026.

The same rule went further on the refrigeration side: supermarket systems and remote condensing units get an interim GWP limit of 1,400, and cold storage warehouses 700, running to January 1, 2032, when the stricter limits take effect.

Not everyone in the industry wanted this. The Air-Conditioning, Heating, and Refrigeration Institute (AHRI) and the Alliance for Responsible Atmospheric Policy opposed the changes, arguing that extending demand for higher-GWP refrigerants while the AIM Act keeps cutting their supply pushes refrigerant prices up rather than down. AHRI also noted that over 90 percent of new residential and light commercial equipment already uses the next-generation refrigerants, and that the rule leaves manufacturers who spent to meet the original dates worse off. HARDI, which fought for the installation relief, criticized the commercial refrigeration extensions on the same supply-and-demand grounds, estimating nearly $8 billion in added refrigerant costs and up to $13 billion in broader impact.

What did not change

The manufacture ban stands. No new complete R-410A residential or light commercial systems have been built or imported for new-system use since January 1, 2025. What the reversal legalized is a finite supply. The guidance to builders from the National Association of Home Builders (NAHB) says it plainly: the supply of these units will eventually run out. Components for servicing existing systems are still being made.

The phasedown stands. The HFC production schedule in the AIM Act keeps stepping down independently of the equipment rules, reaching 15 percent of baseline by 2036. That is the supply curve behind the price warnings, and the reversal did nothing to it.

Service was never banned. Existing R-410A systems can be serviced and repaired as always. The rule was about new equipment, a point AHRI’s May 2026 statement made flatly: this was never a rule forcing anyone to replace existing equipment, and reversing it changes nothing for the installed base.

States can be stricter, and one is. New York adopted a statewide regulation, 6 NYCRR Part 494. Under the regulation the January 1, 2026 deadline stays in force for these systems despite the federal reversal, subject to the exemptions in one section of the regulation and the variances another section allows the state to grant. ACCA’s summary says the state goes further, restricting virgin refrigerant and setting later prohibitions that cover even A2L equipment categories. Federal relief is a floor, and the rules on your job site may be stricter.

Window units are on their own schedule. For products that need no field assembly, the rules give a final sale date of three years after the manufacture compliance date, no later than January 1, 2028, with no installation deadline at all.

Date	What happened
January 1, 2025	Manufacture and import ban takes effect for new residential and light commercial products, and for components destined for new systems, above 700 GWP. Still in force.
Late December 2025	The EPA announces enforcement of the installation deadline is a low priority while reconsideration runs
January 1, 2026	Original installation deadline arrives, technically in effect but deprioritized
May 21, 2026	The EPA announces the final rule removing the installation deadline for pre-2025 equipment
May 26, 2026	Final rule is published in the Federal Register
July 27, 2026	Final rule takes effect
January 1, 2032	Interim GWP limits for supermarket systems, remote condensing units, and cold storage warehouses end
2036	HFC production reaches 15 percent of baseline under the AIM Act phasedown

What it means on the truck

Installing a pre-2025 R-410A system is federally legal again, with no expiration on that permission. Whether it is a good idea comes down to the paperwork and the state code. The federal relief covers systems whose specified components, the components the rule itself lists, were manufactured in the United States or imported before January 1, 2025. Verify that from the paperwork behind the equipment, and from labels where they exist. The labeling rules allow the required information to appear on a label, the packaging, or a QR code rather than a plain date on the nameplate. Equipment that shipped before those rules took hold may carry none of it, which leaves the invoice and the manufacturer’s records. Nothing newer exists for new-system use anyway. State rules are the other check, and New York has kept its deadline, subject to the exemptions and variances in its regulation.

The conversation with the customer changed more than the rulebook did. A homeowner buying R-410A equipment in 2026 is buying into a refrigerant whose production federal law is cutting year over year, and whose price the industry’s own associations expect to rise. That is not a reason to refuse the work. Pre-2025 equipment can be the right answer on price, availability, or matching an existing system. It is a reason to put the refrigerant trajectory in the quote conversation, because the warning the trade groups published is exactly higher service costs later, and the customer should hear that at the quote rather than at the first recharge.

My take

The reversal fixed a real problem, and the fix has a cost. Stranding built equipment that distributors valued at more than half a billion dollars would have helped nobody, and the EPA acknowledged the stranded-inventory problem in so many words. But the trade groups warning about refrigerant prices are describing arithmetic, not lobbying: the phasedown cuts supply on a schedule while the reversal extends demand, and the customers and technicians most likely to feel that spread are not the ones who wrote either rule. They are the equipment owners holding these systems when the later phasedown steps take effect, and the technicians explaining the cost of a recharge. If you install R-410A this year, and there are good reasons to, write the refrigerant math into the proposal instead of letting it arrive as a surprise later.

Common mistakes

Check the manufacture or import date on any R-410A system before installing it, from the documentation first and from labels or packaging where they exist. The federal relief covers systems whose specified components were built in the United States or imported before January 1, 2025.
Check state and local rules before quoting an R-410A install, because New York kept the original deadline in force by regulation and states can set their own rules.
Tell the customer where R-410A supply is headed, because the AIM Act phasedown continues regardless of the installation relief and the trade associations expect prices to rise.
Keep quoting A2L equipment on its merits, because over 90 percent of new residential and light commercial equipment already runs the next-generation refrigerants, by AHRI’s count, and manufacturers have built their investment around them.
Treat VRF and VRV systems as their own case with their own dates, because the December relief and the coverage of the final rule addressed them separately from ordinary split systems.

Don’t

Do not read the reversal as R-410A coming back, because making or importing new R-410A products remains prohibited, components made after 2024 are for servicing existing equipment only, and the installable supply is whatever was built before 2025.
Do not tell customers R-410A service is ending, because servicing existing systems was never banned and components for them are still being manufactured.
Do not treat the federal rule as the whole answer, because states can be stricter and at least one already is.
Do not promise stable refrigerant pricing on any HFC system, because the aggregate HFC production cap steps down by law to 15 percent of baseline by 2036 and the industry’s own associations project prices upward.
Do not carry pre-2025 inventory as if the deadline might return without checking, because the final rule removed the deadline outright rather than extending it to a new date.

Frequently asked questions

Is it legal to install an R-410A system in 2026?

Under federal law, yes: an R-410A install is legal in 2026 provided every specified component of the system was manufactured or imported before January 1, 2025. The EPA’s final rule, announced May 21, 2026 and published in the Federal Register on May 26, removed the January 1, 2026 installation deadline for residential and light commercial air conditioners and heat pumps above 700 GWP, effective July 27, 2026. State rules can differ, and New York’s regulation does: it keeps the original deadline in force there, subject to the exemptions written into the regulation and the variances the state can grant under it.

Is R-410A banned?

Not for the equipment already in the field: servicing and repairing existing R-410A systems remains legal, and components for those systems are still manufactured. What is prohibited is manufacturing or importing R-410A residential and light commercial products, and assembling new systems from components made after 2024; components are still made and imported for servicing existing equipment, carrying a label that shows that use. That has been the case since January 1, 2025. The refrigerant itself is still produced, inside an aggregate HFC cap that steps down by law to 15 percent of baseline by 2036 under the AIM Act, which is the arithmetic behind the price warnings.

Why did the EPA reverse the installation deadline?

The EPA reconsidered the rule after the A2L transition hit distribution problems. ICC reported those problems as shortages of R-454B and of the cylinders to move it in, and the EPA’s final rule described them as enough bulk R-454B supply bottlenecked at the service cylinders. Distributors also reported large inventories at risk of stranding. HARDI put its members’ exposure above $500 million, more than 2,300 comments came in on the proposal, and the EPA acknowledged the stranded-inventory problem. The final rule allows pre-2025 equipment to be installed until supplies run out.

Will R-410A refrigerant get more expensive?

The industry’s own trade groups argue the price is headed up. AHRI and the Alliance for Responsible Atmospheric Policy opposed the extensions on the grounds that they raise demand for refrigerants whose supply the AIM Act phasedown is cutting, and HARDI estimated billions in added refrigerant costs from the commercial extensions alone. That is a projection rather than a schedule, but the production numbers behind it are law.

Did anything change for A2L equipment?

The transition to A2L refrigerants continues. The manufacture ban that pushed new equipment to R-454B and R-32 is untouched, and AHRI states that over 90 percent of new residential and light commercial equipment already uses the next-generation refrigerants. The reversal changes what happens to the R-410A equipment built before 2025, not where new equipment is headed.

Glossary

A2L: the mild-flammability refrigerant safety class that R-454B and R-32 belong to.
ACCA: Air Conditioning Contractors of America, a contractor trade association.
AHRI: the Air-Conditioning, Heating, and Refrigeration Institute, the manufacturers’ trade association.
AIM Act: the American Innovation and Manufacturing Act, the 2020 law that phases down hydrofluorocarbon production.
EPA: the Environmental Protection Agency, which wrote the Technology Transitions rule.
GWP: global warming potential, a refrigerant’s warming effect relative to carbon dioxide.
HARDI: Heating, Air-conditioning and Refrigeration Distributors International, the distributors’ trade association.
HFC: hydrofluorocarbon, the refrigerant family that includes R-410A and R-454B.
ICC: the International Code Council, which publishes model building and mechanical codes.
NAHB: the National Association of Home Builders, a builders’ trade association.
NYCRR: New York Codes, Rules and Regulations, where New York’s own refrigerant rule sits.
Sell-through window: the period in which equipment already built may still be installed.
Technology Transitions rule: the EPA rule setting refrigerant limits by equipment type and date.
VRF: variable refrigerant flow, a multi-zone system type on its own compliance schedule.
VRV: variable refrigerant volume, Daikin’s name for the same system type.

Drafted with AI assistance and reviewed by the author.

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