Just before we reach the end of the year of 2025, we have a new EPA SNAP Rule—namely, EPA SNAP Rule 27. In this article, we will provide you with a brief overview of this new proposed rule, along with key dates and deadlines to pay attention to.

SNAP Rule 27: New Proposed Refrigerant Rule by the U.S. EPA

On October 24, 2025, the U.S. EPA proposed a rule under the Significant New Alternatives Policy (SNAP) which proposes the following:

• List several substitutes as acceptable, subject to use conditions, in the refrigeration and air conditioning sector.
• Update use conditions for multiple refrigerants (i.e., R-290 (propane) in water coolers and for eight refrigerants in residential and light commercial AC and heat pump applications)
• Co-propose two use condition options related to equipment certification or industry safety standard requirements for multiple refrigerants

Acceptable Alternatives, with Use Conditions

Acceptable Alternatives, with Updated Use Conditions

How to Send Comments to the EPA

Listen up: Here’s where the details can get finicky. HVAC-R stakeholders must submit comments on or before December 26, 2025.

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This proposed refrigerant rule is yet another layer to know about in terms of new refrigerant regulations.

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Thank you for reading. Until next time, stay cool, y’all!

This article was updated on December 18, 2025.