The R-410A transition has been one of the most disruptive changes the trade has dealt with in years, and in 2026 the timeline moved again. If you have been planning stock around the original deadline, the position is now different.
What changed
EPA published a final rule in May 2026, effective 27 July 2026, allowing the continued installation in homes of HVAC units manufactured or imported before 1 January 2025 that use R-410A — until existing supplies of those units are depleted.
The original Technology Transitions rule had set 1 January 2026 as the point after which contractors could no longer install pre-2025 R-410A systems. EPA ran into implementation problems around the availability and cost of A2L refrigerant in the field, and the amended rule removed that installation deadline rather than extending it to a new fixed date.
The dates that still matter
- 1 January 2025 — the manufacture/import cutoff that determines which R-410A units remain eligible for installation.
- 27 July 2026 — effective date of the amended rule.
- 1 January 2028 — final sale deadline for products that do not require field assembly, such as window units.
- 2036 — R-410A production is scheduled to fall to 15% of current output under the AIM Act phasedown.
Federal relief is not the whole picture
State law can be stricter. New York codified the original 1 January 2026 deadline into state law, so R-410A system installation is prohibited there despite the federal relaxation. Check your state position before you commit to stock.
What it means for buying
Removing the installation deadline takes the immediate pressure off existing R-410A equipment, but it does not change the direction of travel. The AIM Act phasedown continues to squeeze R-410A production, and the long-run trend on price and availability points one way.
Practically, that means two things. Keep servicing R-410A systems — there will be a very large installed base for many years, and service gas will be needed. At the same time, build A2L capability now: R-454B and R-32 handling, leak detection and the training that goes with mildly flammable refrigerants.
We stock both sides of the transition, in cylinders and in quarter, half and full pallets. If you want a view on where pricing is heading before you commit to a pallet, ask us for a quote and we will tell you what we are seeing.
This article is general information, not compliance advice. Confirm current federal and state requirements before acting.
