Key Insight
The AIM Act is the statutory frame. The Technology Transitions rule is the operational rule. HVAC acquisitions in 2026 are still absorbing the Jan 1, 2025 and Jan 1, 2026 transition dates set by that rule.
The legal architecture
The American Innovation and Manufacturing Act (AIM Act) was enacted in December 2020 as part of broader federal climate legislation. The statute directs the EPA to administer a sector-by-sector phase-down of high-GWP hydrofluorocarbon (HFC) refrigerants on a defined schedule and authorizes a set of related rulemaking — production allocation, technology transitions, and reclaim/refill management — to implement the phase-down.
The rule that matters most for HVAC acquisition diligence is the EPA's Technology Transitions final rule, codified at 40 CFR Part 84, Subpart B. This rule sets the sector-specific GWP limits for new equipment manufacture: in the residential and light-commercial HVAC sectors, the rule limits new equipment to refrigerants with GWP at or below 700, effective January 1, 2025 for self-contained units (window units, packaged terminal AC, portable AC) and January 1, 2026 for field-assembled split systems.
Why the transition dates matter operationally
Equipment manufactured before the transition date can continue to be sold, installed, and serviced indefinitely. Equipment manufactured on or after the transition date must comply with the GWP limit. The practical effect: R-410A pre-charge inventory, R-410A new-stock equipment in distribution channels, and manufacturer-warranty service on R-410A installed base all continue, but new manufacture is exclusively A2L. This creates a 24–36 month transition zone in which residential HVAC contractors must be capable of selling, installing, and servicing both refrigerant categories.
The September 2025 reconsideration
In September 2025, the EPA issued a notice of proposed rulemaking to reconsider portions of the Technology Transitions rule. The reconsideration is on EPA's docket as of mid-2026; the rule itself remains in effect, and the January 1, 2025 and January 1, 2026 transition dates remain operative. Acquisition diligence should treat the reconsideration as a tail risk worth flagging — not a basis for assuming the rule is reversed — and verify the current docket status with counsel on any deal where refrigerant exposure is material to the underwriting.
A residential HVAC deal with substantial 2026 install volume: confirm the equipment-mix split between R-410A pre-2025 stock (still sellable) and A2L 2025+ manufacture; confirm that A2L technician training and leak-detection equipment are in place; flag any reliance on the September 2025 reconsideration as part of the buyer's underwriting case. The transition dates themselves are not in dispute and are not the right place to take risk.
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