Data / Federal rules / 2024-29243

Phasedown of Hydrofluorocarbons: Restrictions on the Use of HFCs Under the AIM Act in Variable Refrigerant Flow Air Conditioning Subsector

The Environmental Protection Agency published this final rule in the Federal Register on December 12, 2024. It took effect on January 13, 2025.

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What the agency says

The U.S. Environmental Protection Agency is amending a provision of the 2023 Technology Transitions regulations promulgated under the American Innovation and Manufacturing Act of 2020. This action provides until January 1, 2027, for the installation of certain new variable refrigerant flow air conditioning and heat pump systems which use components manufactured in the United States or imported into the United States prior to January 1, 2026. This action also provides until January 1, 2028, for the installation of certain new variable refrigerant flow air conditioning and heat pump systems if a building permit that approves the use of a hydrofluorocarbon or blend containing a hydrofluorocarbon in such a system was issued prior to October 5, 2023, provided that the system uses components manufactured in the United States or imported into the United States prior to January 1, 2026. This action will mitigate the potential for stranded inventory of variable refrigerant flow systems.

Key facts

Document number: 2024-29243
Type: Final rule
Action: Final rule
Agency: Environmental Protection Agency
Published: December 12, 2024
Takes effect: January 13, 2025
Dates: This final rule is effective on January 13, 2025.
Docket: EPA-HQ-OAR-2021-0643; FRL-11739-02-OAR
Regulation ID (RIN): 2060-AW20
Code of Federal Regulations: 40 CFR 84
Topics: Administrative practice and procedure; Air pollution control; Chemicals; Environmental protection; Imports; Reporting and recordkeeping requirements
Pages: 12

The document on federalregister.gov PDF

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Everything from the Environmental Protection Agency · Rules on administrative practice and procedure · Rules on air pollution control · Rules on chemicals · Published in December 2024

Read from the Federal Register API, last updated 2026-10-23. The document on federalregister.gov is the official record; dates and dockets can change through later corrections. Free to reuse with credit to SpecStream under CC BY 4.0.