EPA announced a final rule revising the 2023 Technology Transitions Rule, which EPA had issued in response to the American Innovation and Manufacturing (AIM) Act. The AIM Act authorized EPA to regulate hydrofluorocarbons (HFCs) in three main areas: phasing down the production and consumption of listed HFCs; management of these HFCs and their substitutes; and facilitating the transition to next-generation technologies by restricting use of these HFCs in the sector or subsectors in which they are used. HFCs are a significant contributor to climate change, hundreds of times more potent than carbon dioxide in the short term. EPA’s revisions to the Technology Transitions Rule extend compliance deadlines and loosen coverage requirements for supermarket systems, remote condensing units, cold storage warehouses, industrial process refrigeration equipment used in semiconductor manufacturing, residential and light commercial air conditioning and heat pump systems, and certain refrigerated transport and laboratory equipment.