# 2026-06665: EPA Proposes New Refrigerant Approval for Heavy-Duty Truck Air Conditioning

2026-06665, Protection of Stratospheric Ozone: Listing of Substitutes Under the Significant New Alternatives Policy Program in Refrigeration and Air Conditioning and Fire Suppression; Supplemental Notice of Proposed Rulemaking, is a Federal Register proposed rule from Environmental Protection Agency published 2026-04-06, effective Comments on this supplemental proposal must be received on or before May 6, 2026 unless a public hearing is held. If a public hearing is held, comments on this supplemental proposal must be received on or before 30 days after the date of the public hearing. Public hearing: Any party requesting a public hearing must notify the contact listed in the FOR FURTHER INFORMATION CONTACT section, which is Emily Maruyama at email address: maruyama.emily@epa.gov by 5 p.m. Eastern Daylight Time on or before April 13, 2026. If a public hearing is held, it will take place on or around April 21, 2026. Please refer to the SUPPLEMENTARY INFORMATION section for additional information on the public hearing.; PRIA reads it as touching household money (as of 2026-06-11).

- Canonical: https://policyrisk.com/federal-register/2026-06665
- As of: 2026-06-11
- Plain-text twin of the page above; the HTML and this file carry the same facts.

## Facts
- Document number: 2026-06665
- Title: Protection of Stratospheric Ozone: Listing of Substitutes Under the Significant New Alternatives Policy Program in Refrigeration and Air Conditioning and Fire Suppression; Supplemental Notice of Proposed Rulemaking
- Type: Proposed Rule
- Agencies: Environmental Protection Agency
- Citation: 91 FR 17176
- Published: 2026-04-06
- Effective: Comments on this supplemental proposal must be received on or before May 6, 2026 unless a public hearing is held. If a public hearing is held, comments on this supplemental proposal must be received on or before 30 days after the date of the public hearing. Public hearing: Any party requesting a public hearing must notify the contact listed in the FOR FURTHER INFORMATION CONTACT section, which is Emily Maruyama at email address: maruyama.emily@epa.gov by 5 p.m. Eastern Daylight Time on or before April 13, 2026. If a public hearing is held, it will take place on or around April 21, 2026. Please refer to the SUPPLEMENTARY INFORMATION section for additional information on the public hearing.
- Comments close: not stated
- Significant: no
- Touches household money: yes
- Regulation identifier numbers: 2060-AW45
- Last updated: 2026-06-11

## In one line

EPA Proposes New Refrigerant Approval for Heavy-Duty Truck Air Conditioning

## Summary

The EPA wants to officially approve a new refrigerant called HFO-1234yf for use in heavy-duty pickup trucks and vans’ air conditioning systems, but with some rules to keep things safe. This update adds details and invites the public to share their thoughts by May 6, 2026. If you’re in the vehicle or refrigeration world, this could affect your choices and costs soon!

## Abstract

Pursuant to the U.S. Environmental Protection Agency's Significant New Alternatives Policy program, this action proposes to list the refrigerant 2,3,3,3-tetrafluoropropene, also known as HFO- 1234yf, as acceptable, subject to use conditions, in the motor vehicle air conditioning end-use for retrofit of heavy-duty pickup trucks and complete heavy-duty vans. This action supplements the Agency's November 10, 2025, proposal with respect to the proposed listings in the motor vehicle air conditioning end-use for retrofit of heavy-duty pickup trucks and heavy-duty vans (both complete and incomplete vans). The EPA is also supplementing that proposal to clarify the intended scope of that proposed rule. The EPA is providing an opportunity for public comment on the additional listing and the clarification. The EPA is not reopening the comment period for any portions of the November 10, 2025, proposal which are not explicitly addressed in this supplemental proposal.

## Effects PRIA read

- New Refrigerant Allowed for Heavy-Duty Retrofits: benefit, medium. The EPA proposes to list the refrigerant HFO-1234yf (CAS Reg. No. 754-12-1) as “acceptable, subject to use conditions” for retrofitting motor vehicle air conditioning (MVAC) systems in heavy‑duty (HD) pickup trucks and complete HD vans. This would give vehicle makers, repair shops, and others anoth…
- EPA Safety Finding for HFO-1234yf Use: benefit, low. The EPA's risk screen found that HFO-1234yf is not expected to cause a significant risk to human health in the general population when manufactured for use and used as a refrigerant in HD pickup truck and complete HD van AC systems, provided systems are installed with proper engineering controls an…

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## Sources
- [2026-06665 on federalregister.gov](https://www.federalregister.gov/documents/2026/04/06/2026-06665/protection-of-stratospheric-ozone-listing-of-substitutes-under-the-significant-new-alternatives)
- [2026-06665 as published (PDF)](https://www.govinfo.gov/content/pkg/FR-2026-04-06/pdf/2026-06665.pdf)

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Source: PRIA, https://policyrisk.com/federal-register/2026-06665 (as of 2026-06-11).