The Short Answer: Is HCR 410 / HCR 4141 EPA Approved?
As of March 2026, the EPA has not finalized any rule granting SNAP approval to HCR 4141 (often marketed with HCR 410 branding). While a proposed rule (Rule 27) was published in November 2025, it is not finalized. If finalized in its current form, Rule 27 would permit HCR 4141 only in new equipment specifically designed for it, and would prohibit its use as a drop-in retrofit substitute in existing air conditioning systems.
Understanding EPA SNAP Rule 27
The EPA's Significant New Alternatives Policy (SNAP) evaluates substitutes for ozone-depleting substances. BHCR Hq Corp S.A. submitted an application for HCR 4141 in October 2022. The resulting proposed rule was published in November 2025.
EPA SNAP Rule 27 (Proposed)
90 Fed. Reg. 215 "EPA is proposing to list HCR-4141 as acceptable, subject to use conditions, in new household refrigerators and freezers and new room air conditioners."
Because HCR 4141 is highly flammable (ASHRAE Class A3), the proposed rule imposes strict use conditions. Under the Clean Air Act, selling or using a substitute substance prior to finalized SNAP approval, or using it in a manner prohibited by the rule (such as retrofitting), is a direct violation.
What HVAC Professionals Need to Know
For technicians and distributors considering HCR 4141: the EPA has levied civil penalties against companies that sold hydrocarbon refrigerants as drop-in substitutes. (Enviro-Safe DOJ) (Northcutt EPA) The same enforcement framework applies today. See the HVAC Professionals Guide for documented penalty amounts and reporting resources.
Frequently Asked Questions
Can I legally install HCR 4141 in a system designed for R-410A?
No. Neither the proposed SNAP Rule 27 nor any existing finalized rule permits the use of HCR 4141 as a substitute in existing systems. Doing so violates federal law.
Why did the EPA propose restricted use for HCR 4141?
HCR 4141 is a hydrocarbon mixture with an ASHRAE Safety Group A3 classification, the highest flammability category for refrigerants. Systems designed for non-flammable refrigerants lack the spark-prevention components required to safely handle A3 substances.
Where can I read the official EPA filings?
The full text of the Clean Air Act Section 612 and relevant Federal Register publications are maintained in our Evidence Archive.