# residential or light commercial air-conditioning or heat pump systems — US AIM Act sector-specific refrigerant GWP limits and compliance dates (40 CFR 84.54)

For residential or light commercial air-conditioning or heat pump systems, restriction type is installation; maximum gwp is 700; effective date is January 1, 2025; conditions is may continue to be installed where all specified components of that system are manufactured or imported prior to January 1, 2025; exemptions is except for variable refrigerant flow air-conditioning and heat pump systems, recorded from its source on 2026-08-06.

- **Sector/subsector:** residential or light commercial air-conditioning or heat pump systems _(verified: appears in the quote below)_
- **Restriction type:** installation _(our reading, not quoted from the source)_
- **Maximum GWP:** 700 _(verified: appears in the quote below)_
- **Effective date:** January 1, 2025 _(verified: appears in the quote below)_
- **Conditions:** may continue to be installed where all specified components of that system are manufactured or imported prior to January 1, 2025 _(verified: appears in the quote below)_
- **Exemptions:** except for variable refrigerant flow air-conditioning and heat pump systems _(verified: appears in the quote below)_
- **CFR paragraph:** § 84.54(c)(1) _(our reading, not quoted from the source)_

## What the source says

> ( 1 ) Effective January 1, 2025, residential or light commercial air-conditioning or heat pump systems using a regulated substance, or a blend containing a regulated substance, with a global warming potential of 700 or greater, except for variable refrigerant flow air-conditioning and heat pump systems. New residential and light commercial air-conditioning and heat pump systems using a regulated substance, or a blend containing a regulated substance, with a global warming potential of 700 or greater may continue to be installed where all specified components of that system are manufactured or imported prior to January 1, 2025.

## Source

- https://www.ecfr.gov/current/title-40/chapter-I/subchapter-C/part-84

Last verified: 2026-08-06. Review by: 2027-02-02.
Part of [US AIM Act sector-specific refrigerant GWP limits and compliance dates (40 CFR 84.54)](https://referencesource.org/aim-act-refrigerant-gwp-sector-limits/).