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R-410A in 2026: What the Latest EPA Rule Means for HVAC Technicians
R-410A has been the standard refrigerant in U.S. residential air conditioners and heat pumps for about two decades. Since the AIM Act and EPA’s Technology Transitions rules, the industry has been moving to lower-global-warming-potential (GWP) refrigerants such as R-454B and R-32. In 2026 the rules changed again. This guide sums up where things stand and what it means for your work.
In short: since July 27, 2026, there is no federal deadline for installing qualifying R-410A systems built from legacy components. New residential and light-commercial systems built from newer components must still use a refrigerant with a GWP below 700, and existing R-410A systems can still be serviced.
How we got here
The American Innovation and Manufacturing (AIM) Act of 2020 directs EPA to phase down U.S. production and consumption of hydrofluorocarbons (HFCs) by 85% by 2036, compared with a historic baseline. As part of that effort, EPA’s 2023 Technology Transitions rule set GWP limits for new equipment. For residential and light-commercial air conditioning and heat pump systems, new systems were required to use a refrigerant with a GWP below 700. R-410A, with a GWP of about 2,088, is far above that limit.
That rule also included a deadline for installing systems that still used R-410A components made before the change. The installation window was later extended to December 31, 2025.
What changed in 2026
EPA’s final rule Phasedown of Hydrofluorocarbons: Reconsideration of Certain Regulatory Requirements took effect on July 27, 2026. Among other things, it:
- removes the federal installation deadline for qualifying non-VRF residential and light-commercial AC and heat pump systems built entirely from eligible legacy components that use R-410A or another refrigerant with a GWP of 700 or more;
- allows distributors to keep selling qualifying legacy inventory;
- keeps the ability to service and repair existing R-410A systems, including with replacement components labeled for servicing existing equipment.
What did not change: R-410A components manufactured in or imported into the U.S. on or after January 1, 2025 cannot be used to assemble new systems, and new systems that do not qualify under the legacy-inventory provision must use a refrigerant with a GWP below 700.
The replacement refrigerants: R-454B and R-32
Most manufacturers of new residential systems have moved to one of two refrigerants:
- R-454B: a blend with a GWP of about 466, used by many major U.S. brands.
- R-32: a single-component refrigerant with a GWP of about 675, widely used worldwide, especially in ductless systems.
Both are classified A2L under ASHRAE Standard 34: low toxicity and lower flammability. They are much harder to ignite than flammable refrigerants such as propane, but they are not non-flammable like R-410A, and that affects how you work with them.
What it means on the job
- Never mix refrigerants or top off with a different one. R-454B and R-32 are not drop-in replacements for R-410A. Always charge the refrigerant shown on the equipment nameplate.
- Check your tools. Recovery machines, vacuum pumps, leak detectors and other tools used with A2L refrigerants should be rated for A2L use by their manufacturer.
- Control ignition sources. Ventilate the work area and keep sparks, open flames and other ignition sources away while the system is open.
- Know your cylinders. Containers of A2L refrigerants are typically marked with a red band, and many use left-hand-thread valves. Always read the cylinder label before connecting.
- Get trained. Your EPA Section 608 certification still applies, and many manufacturers, unions and trade groups offer A2L handling courses. Local codes may also have specific requirements.
- Keep recovering. Venting refrigerant is still prohibited, and recovered R-410A can be reclaimed and returned to service, which helps keep it available for repairs.
What about R-410A supply and prices?
R-410A will remain available for servicing existing systems. Because the AIM Act phases down HFC supply in steps, prices can change over time. Recovering and reclaiming refrigerant, fixing leaks rather than repeatedly recharging, and planning purchases ahead all help.
Frequently asked questions
Can I still buy R-410A?
Yes, for servicing existing equipment. As with other refrigerants, it may only be sold to EPA Section 608 certified technicians or businesses that employ them. See our guide Who Can Buy Refrigerant?
Can I put R-454B into an R-410A system?
No. Only charge the refrigerant specified on the equipment nameplate. Converting a system is a matter for the equipment manufacturer’s instructions, not a refill.
Does my Section 608 certification cover A2L refrigerants?
Yes, Section 608 certification applies to R-454B and R-32. Additional A2L safety training is strongly recommended.
Official sources
This article is general information, updated in November 2026, and is not legal advice. HFC rules have changed several times, so always check the latest EPA guidance and the equipment manufacturer’s instructions. Looking for refrigerant? Browse our catalog or contact our team.