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
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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.
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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