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Significant New Alternatives Policy (SNAP)

Substitutes in MVAC: Passenger Air Conditioning in Light-Duty, Medium-Duty, Heavy-Duty and Off-Road Vehicles

You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.Substitutes are reviewed on the basis of environmental and health risks, including factors such as ozone depletion potential, global warming potential, toxicity, flammability, and exposure potential. Lists of acceptableHelpacceptableThis designation means that a substitute may be used, without restriction, to replace the relevant ODS within the end-use specified. For example, HCFC-22 is an acceptable substitute for R-502 in industrial process refrigeration. Note that all SNAP determinations apply to the use of a specific product as a substitute for a specific ODS in a specific end-use. and unacceptableHelpUnacceptableThis designation means that it is illegal to use a product as a substitute for an ODS in a specific end-use. For example, HCFC-141b is an unacceptable substitute for CFC-11 in building chillers. Note that all SNAP determinations apply to the use of a specific product as a substitute for a specific ODS in a specific end-use. substitutes are updated several times each year. The list of substitutes is shown below.

Note: SNAP-related information published in the Federal Register takes precedence over all information on this page.

               
Substitute Trade Name(s) Retrofit/New ODPHelpODPA number that refers to the amount of ozone depletion caused by a substance. The ODP is the ratio of the impact on ozone of a chemical compared to the impact of a similar mass of CFC-11. Thus, the ODP of CFC-11 is defined to be 1.0. Other CFCs and HCFCs have ODPs that range from 0.01 to 1.0. The halons have ODPs ranging up to 10. Carbon tetrachloride has an ODP of 1.2, and methyl chloroform's ODP is 0.11. HFCs have zero ODP because they do not contain chlorine. A table of all ozone-depleting substances (https://www3.epa.gov/ozone/science/ods/index.html) shows their ODPs, GWPs, and CAS numbers. GWPHelpGWPThe index used to translate the level of emissions of various gases into a common measure in order to compare the relative radiative forcing of different gases without directly calculating the changes in atmospheric concentrations. GWPs are calculated as the ratio of the radiative forcing that would result from the emissions of one kilogram of a greenhouse gas to that from the emission of one kilogram of carbon dioxide over a period of time (usually 100 years). Gases involved in complex atmospheric chemical processes have not been assigned GWPs. See lifetime. ASHRAEHelpASHRAEASHRAE is an international organization that establishes standards for the uniform testing and rating of heating, ventilation, air conditioning, and refrigeration equipment. It also conducts related research, disseminates publications, and provides continuing education to its members.
Designation
(Safety
Classification)
SNAP Listing Date Listing Status
Evaporative Cooling   N 0 N/A N/A March 18, 1994 Acceptable
RB-276 Free Zone, HCFC Blend Delta R/N 0.013 1,592 A1 May 22, 1996;
July 20, 2015
Unacceptable as of MY 2017. Detailed conditions apply - see rule.
Freeze 12 Freeze 12 R/N 0.013 1,606 A1 October 16, 1996;
July 20, 2015
Unacceptable as of MY 2017. Detailed conditions apply - see rule.
R-416A FRIGC FR-12, HCFC Blend Beta R/N 0.009 1,081 A1 June 13, 1995;
July 20, 2015
Unacceptable as of MY 2017. Detailed conditions apply - see rule.
GHG-HP HCFC Blend Lambda R/N 0.056 1,893 A1 October 16, 1996;
July 20, 2015
Unacceptable as of MY 2017. Detailed conditions apply - see rule.
R-414A GHG-X4, HCFC Blend Xi, Autofrost, Chill-it R 0.045 1,478 A1 October 16, 1996;
July 20, 2015
Unacceptable as of MY 2017. Detailed conditions apply - see rule.
GHG-X5 GHG-X5 R/N 0.032 2,377 A1 June 3, 1997;
July 20, 2015
Unacceptable as of MY 2017. Detailed conditions apply - see notice.
HFC-134a   R/N 0 1,430 A1 March 18, 1994;
July 20, 2015
Unacceptable as of Model Year (MY) 2021, except where allowed under a narrowed use limit through MY 2025. [1]

Acceptable, subject to narrowed use limits, for vehicles exported to countries with insufficient servicing infrastructure to support other alternatives, for MY 2021 through MY 2025. [1]

Unacceptable for all newly manufactured vehicles as of MY 2026. [1] Detailed conditions apply - see rule.
HFC-152a   N 0 124 A2 June 12, 2008 Acceptable with Use Conditions: See rule for detailed conditions.
HFO-1234yf Opteon™ XL10, Solstice® yf  N 0 4 A2L March 29, 2011;
December 1, 2016
Acceptable with Use Conditions: For use in newly manufactured passenger cars, light-duty trucks, medium-duty passenger vehicles, heavy-duty pickup trucks, and complete heavy-duty vans; see rules for detailed conditions.
R-414B Hot Shot, Kar Kool, HCFC Blend Omicron R/N 0.098 3,337 A1 October 16, 1996;
July 20, 2015
Unacceptable as of MY 2017. Detailed conditions apply - see rule.
Ikon A Ikon-12, Blend Zeta R/N 0 N/A A1 May 22, 1996 Acceptable with Use Conditions: See rule for detailed conditions.
R-401C   R/N 0 933 A1 June 13, 1995 Acceptable
R-406A GHG-12, GHG-X3, McCool, Autofrost X3 R/N 0.057 1,900 A2 October 16, 1996;
July 20, 2015
Unacceptable as of MY 2017. Detailed conditions apply - see rule.
R-426A RS-24 R/N 0 1,510 A1 September 28, 2006;
July 20, 2015
Unacceptable as of MY 2017. [1] Detailed conditions apply - see notice.
R-744 (Carbon Dioxide, CO2)   N 0 1 A1 June 6, 2012 Acceptable with Use Conditions: See rule for detailed conditions.
RS-24 (2002 formulation)   R/N 0 1,510 A1 December 20, 2002 Acceptable with Use Conditions: See notice for detailed conditions.
Small auxiliary power units that include an engine, electrical alternator, water pump, air conditioning compressor and a heat exchanger used in tractor trailers in conjunction with passenger compartment climate control systems that already use an acceptable substitute refrigerant.   R/N 0 N/A N/A June 19, 2000 Acceptable
SP34E SP34E R/N 0 <1,470 A1 December 18, 2000;
May 23, 2001;
July 20, 2015
Unacceptable as of MY 2017. [1] Detailed conditions apply - see notice; use of new fittings for small refrigerant cans required.
Stirling Cycle   N 0 N/A N/A March 18, 1994 Acceptable

1 As per EPA’s April 27, 2018 guidance (83 FR 18431), based on the court’s partial vacatur, in the near term EPA will not apply these HFC listings in the 2015 Rule, pending a rulemaking.

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