EPA Won't Enforce R-410A Installation Ban for Now, But AIM Act Threshold Drops to 15 Pounds

Two moves from the EPA in opposite directions — and HVAC contractors need to track both.

First, the enforcement pause: on December 23, 2025, EPA announced that enforcing the January 1, 2026 R-410A installation prohibition — the part of the Technology Transitions Rule that bars new residential and light-commercial AC and heat pump installs using R-410A — is a low enforcement priority while the agency reconsiders the rule. The prohibition itself is still legally in effect; EPA has simply said it won't prioritize federal enforcement for now, and a formal repeal has been proposed but not finalized. In practice that gives contractors continued access to R-410A equipment, but state and local codes may still apply.

Second, the tightening: under the AIM Act's Emissions Reduction and Reclamation rule (40 CFR Part 84, Subpart C), leak-repair requirements now apply to appliances with a full charge of 15 or more pounds of HFC refrigerant as of January 1, 2026. A standard residential split system with R-410A contains 6-12 pounds — below the line. But multi-zone systems, light commercial rooftop units, and VRF systems routinely exceed 15 pounds. Those systems now require formal leak tracking, annual rate calculations, and mandatory repairs within 30 days if the leak rate exceeds applicable thresholds.

What the R-410A Enforcement Pause Means

Short version: for now you can keep selling and installing R-410A equipment without federal enforcement of the install ban, but the ban is still on the books. The transition to R-454B and R-32 continues — manufacturers are bringing low-GWP product lines to market — but EPA's enforcement discretion removes the immediate federal cliff date for residential installations while the rule is reconsidered.

Why it matters: Equipment distributors were caught between manufacturer production schedules and the original ban deadline. Some had already shifted inventory allocations toward R-454B systems that contractors weren't yet trained to install. The enforcement pause gives everyone breathing room — manufacturers, distributors, and contractors.

What it doesn't mean: The prohibition has not been repealed — EPA has only said it won't prioritize enforcement, and state or local codes may still require the switch. The HFC phasedown under the AIM Act is also still in effect. R-410A production and consumption allocations will decrease according to the phasedown schedule: a 70% reduction by 2029 (production and consumption capped at 30% of the 2011-2013 baseline), 80% by 2034, and 85% by 2036. R-410A will get more expensive over time. The transition is happening — it's just not happening via a federally enforced installation ban right now.

The 15-Pound Threshold: Who's Affected

The Section 608 leak-repair regime applied at a 50-pound charge, so only large commercial systems needed formal leak tracking. Under the AIM Act's Subpart C rule, the trigger drops to a 15-pound full charge, and the following system types are now included:

• Multi-zone ductless mini-splits with three or more indoor units (typically 14-20 lbs)
• Light commercial rooftop units 5 tons and above (typically 15-25 lbs)
• VRF systems of any size (typically 20-80 lbs)
• Residential systems with long line sets (a 5-ton split system with a 75-foot line set can hold 16+ lbs)

For these systems, contractors must now:

1. Record the total refrigerant charge at installation
2. Track all refrigerant additions (type, amount, date)
3. Calculate annual leak rate
4. Repair leaks within 30 days if the annual rate exceeds the applicable trigger — 10% for comfort cooling, 20% for commercial refrigeration, and 30% for industrial process refrigeration
5. Maintain records for at least 5 years

What to Do Now

Audit your service agreements. If you maintain any systems with 15+ pounds of HFC, you need a leak-tracking protocol. This can be as simple as a spreadsheet or as sophisticated as a cloud-based refrigerant management platform (BluonTM, Trakref, or similar).

Train on A2L refrigerants. R-454B and R-32 are mildly flammable (A2L classification). Installation requires leak detectors rated for flammable refrigerants, updated brazing procedures, and compliance with ASHRAE 15 and local fire codes. Several manufacturers offer free online training modules. Get your techs certified now, before the demand curve steepens.

Update your EPA 608 knowledge. The 2026 EPA 608 exam now covers A2L safety, HFC phasedown schedules, and the lowered leak-tracking threshold. Technicians renewing or testing for the first time should study the updated material.

For more on the refrigerant transition, see our comprehensive 2026 EPA refrigerant transition update and DOE 2027 efficiency standards.

Sources

U.S. EPA. "Regulatory Actions for Technology Transitions." https://www.epa.gov/climate-hfcs-reduction/regulatory-actions-technology-transitions

U.S. EPA. "Frequent Questions on the Phasedown of Hydrofluorocarbons." https://www.epa.gov/climate-hfcs-reduction/frequent-questions-phasedown-hydrofluorocarbons

U.S. EPA. "Stationary Refrigeration Leak Repair Requirements" (Section 608). https://www.epa.gov/section608/stationary-refrigeration-leak-repair-requirements

U.S. EPA. Emissions Reduction and Reclamation Program, 40 CFR Part 84, Subpart C — Leak Repair, 40 CFR 84.106. https://www.ecfr.gov/current/title-40/chapter-I/subchapter-C/part-84/subpart-C/section-84.106