EPA Proposes Expanded SNAP Listings for HFO-1234yf and Low-GWP Blends

The U.S. Environmental Protection Agency issued a supplemental proposal in April 2026 to list HFO-1234yf as acceptable, subject to use conditions, for retrofit applications in heavy-duty pickup trucks and complete heavy-duty vans. The action supplements a 2025 proposal that had already included HFO-1234yf for light- and medium-duty vehicle retrofits but omitted heavier vehicles after stakeholder comments highlighted the gap. The proposal also co-proposes two options for equipment use conditions: compliance with the latest UL standards or certification by an OSHA-recognized Nationally Recognized Testing Laboratory. Separately, the EPA’s SNAP Rule 27 proposes updating use conditions for R-290 in water coolers and for eight refrigerants in residential and light commercial air conditioning and heat pump applications.