Protection of Stratospheric Ozone: Listing of Substitutes Under the Significant New Alternatives Policy Program in Refrigeration and Air Conditioning and Fire Suppression; Supplemental Notice of Proposed Rulemaking
AI-generated summary for informational purposes only. Not legal advice. See the original source for the authoritative text.
The EPA is issuing a supplemental proposed rule under its SNAP program to list HFO-1234yf (2,3,3,3-tetrafluoropropene) as an acceptable refrigerant, subject to use conditions, for retrofitting motor vehicle air conditioning systems in heavy-duty pickup trucks and complete heavy-duty vans. This supplements a November 10, 2025 NPRM that proposed similar listings for other refrigerants. The agency is also correcting the scope of the earlier proposal for R-444A by removing incomplete heavy-duty vans from its intended coverage. Comments on this supplemental proposal are due by May 6, 2026, or 30 days after a public hearing if one is requested by April 13, 2026. The rule aims to expand refrigerant options while maintaining safety and environmental standards under the Clean Air Act.
AI-generated summary. May contain errors. Refer to official sources for legal decisions.
Key Changes
- Lists HFO-1234yf as acceptable subject to use conditions for MVAC retrofit in heavy-duty pickup trucks and complete heavy-duty vans
- Clarifies that the 2025 NPRM proposal for R-444A applies only to heavy-duty pickup trucks and complete heavy-duty vans (excludes incomplete vans)
- Comments due on or before May 6, 2026 unless public hearing is held
+ 3 more changes with Pro
Obligations
What this law requires
Submit comments on the supplemental proposal by May 6, 2026, or within 30 days after a public hearing if one is held
Request a public hearing by notifying Emily Maruyama at maruyama.emily@epa.gov by 5 p.m. Eastern Daylight Time on or before April 13, 2026, if a hearing is desired
Include Docket ID No. EPA-HQ-OAR-2024-0503 in all comment submissions to the EPA
Comply with use conditions for HFO-1234yf (2,3,3,3-tetrafluoropropene) when used as an acceptable refrigerant for retrofitting motor vehicle air conditioning systems in heavy-duty pickup trucks and complete heavy-duty vans, as specified in the final rule
Ensure that HFO-1234yf refrigerant use is limited to the specified end-uses: retrofit of heavy-duty pickup trucks and complete heavy-duty vans (not incomplete heavy-duty vans)