EPA Walks Back R-410A Installation Ban, 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 rollback: EPA proposed repealing the January 1, 2026 installation prohibition for residential and light-commercial air conditioners and heat pumps using R-410A. The rule that would have banned new R-410A installations is on its way out. Contractors can continue installing R-410A equipment for the foreseeable future while the transition to low-GWP alternatives continues.

Second, the tightening: the AIM Act's expanded regulations lowered the leak-tracking and repair threshold from 50 pounds to 15 pounds of HFC refrigerant. 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 Rollback Means

Short version: keep selling and installing R-410A equipment. The transition to R-454B and R-32 continues — manufacturers are bringing low-GWP product lines to market — but there's no cliff date forcing an immediate switch for residential installations.

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 rollback gives everyone breathing room — manufacturers, distributors, and contractors.

What it doesn't mean: The HFC phasedown under the AIM Act is still in effect. R-410A production allocations will decrease according to the phasedown schedule (40% reduction by 2029, 80% by 2034 versus the 2011-2013 baseline). R-410A will get more expensive over time. The transition is happening — it's just not happening via a hard installation ban.

The 15-Pound Threshold: Who's Affected

The previous 50-pound threshold meant only large commercial systems needed formal leak tracking. At 15 pounds, 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 10% (commercial) or 20% (comfort cooling)
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.