Definition
R-410A is the HFC refrigerant blend, sold under trade names including Puron, used in most U.S. home air conditioners and heat pumps installed from about 2010 through 2024. Its global warming potential exceeds EPA's limit of 700 for new residential systems, so manufacturing and import of new R-410A split systems ended January 1, 2025.
Also called: Puron, HFC-410A
Why it matters to you
If your SW Washington heat pump or air conditioner was installed between about 2010 and 2024, it most likely runs on R-410A. The refrigerant transition changes what new equipment you can buy, not whether your current system can keep heating through the winter and be repaired.
Practical guidance
Confirm the refrigerant on your outdoor unit's data plate. Claims that you must buy a new R-410A system before a January 2026 installation deadline are out of date; an EPA rule published in May 2026 allows pre-2025 inventory to still be installed.
How R-410A options compare
| Refrigerant | GWP | Safety class (ASHRAE 34) | Status for new equipment | Servicing outlook |
|---|---|---|---|---|
| R-22 (HCFC-22) | About 1,810 (IPCC AR4; ozone-depleting HCFC) | A1 | Phased out; U.S. production and import ended in 2020 | Existing systems run on recovered, reclaimed or stockpiled supply only |
| R-410A | 2,088 | A1 | New split-system manufacture and import ended January 1, 2025; pre-2025 inventory may still be installed | Existing systems can be repaired and recharged with R-410A |
| R-454B | 465 | A2L | Used in many new residential systems; under the 700 GWP limit | Serviced with R-454B only, using A2L-rated tools and procedures |
| R-32 | 675 | A2L | Used in many new residential systems, including many ductless mini-splits; under the 700 GWP limit | Serviced with R-32 only, using A2L-rated tools and procedures |
Can R-410A systems still be installed in 2026?
In some cases, yes. EPA's 2023 Technology Transitions rule originally gave pre-2025 R-410A split-system inventory until January 1, 2026 to be installed, but a final rule published in the Federal Register on May 26, 2026 (document 2026-10387) allows equipment manufactured or imported before January 1, 2025 to continue to be installed. The January 1, 2025 manufacturing and import cutoff still stands, so that supply is finite.
Can my existing R-410A heat pump still be repaired and recharged?
Yes. The transition governs which new equipment can be made and installed; it does not stop technicians from servicing systems already in homes. After a leak is found and fixed, a certified technician can recharge an R-410A system with R-410A for the rest of its working life.
What refrigerant replaces R-410A in new heat pumps and air conditioners?
New residential systems mainly use R-32 or R-454B, which EPA's reference table lists at a GWP of 675 and 465, below the 700 limit. Both are classified A2L, meaning lower toxicity and lower flammability, so equipment built for them includes leak-detection and mitigation features required by current safety standards. Different manufacturers chose different refrigerants, so two quotes may specify different ones.
Can I put R-32 or R-454B into my R-410A system?
No. Refrigerants are not interchangeable, and a system should only be charged with the refrigerant it was designed and rated for. Replacing only the outdoor unit with A2L equipment generally means replacing the matching indoor coil too, so expect a replacement quote to cover both.
Should I replace a working R-410A system now because of the transition?
The refrigerant change alone is not a reason to replace a system that heats and cools reliably. Replacement makes sense when age, repeated breakdowns, a major component failure or comfort problems already point that way. Refrigerant rules have changed more than once, so check the date on anything you read before making a decision that depends on a deadline.
About this definition
Written by the Home Energy Group team — a family-owned HVAC company celebrating 25 years of comfort & care across SW Washington and the Portland metro, licensed in Washington (WA LIC# HOMEEGI003J7) and Oregon (OR CCB# 184255). Definitions inform; an on-site diagnosis decides.
Sources & standards
- Federal Register 2026-10387 — EPA reconsideration rule allowing pre-2025 residential inventory to be installed (2026-05-26)
- Federal Register 2023-28500 — EPA Technology Transitions rule, residential and light commercial AC and heat pumps (2023-12-26)
- U.S. EPA — Technology Transitions HFC restrictions by sector (GWP limit 700)
- U.S. EPA — Technology Transitions GWP reference table
- U.S. EPA — Phaseout of Class II Ozone-Depleting Substances
