The U.S. Environmental Protection Agency (EPA) recently closed the public comment window on its proposed revisions to the Technology Transitions (TT) rule — an essential component of the AIM Act that governs how and when the HVACR industry moves away from higher-GWP HFC refrigerants. Released on September 30, the proposal extends compliance deadlines for several equipment categories and raises GWP limits for certain refrigeration applications.
One of the most closely watched revisions would remove the installation cutoff date for residential and light commercial air conditioning and heat pump (AC/HP) systems manufactured or imported prior to 2025. If finalized, this change would give contractors additional time to install remaining R-410A equipment already in the supply chain. EPA is also seeking to temporarily permit higher GWP limits for cold storage warehouses and retail food refrigeration beginning in 2026, with more stringent thresholds scheduled to take effect in 2032.
Boykin Air 