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 acceptableacceptableThis 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 unacceptableUnacceptableThis 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. Substitutes listed below were originally listed as acceptable for use in reciprocating chillers, screw chillers, and/or scroll chillers. Please see the rule or notice shown in the SNAP Listing Date column for more information about the original listing of each substitute.

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

Substitute	Trade Name(s)	Retrofit/New	ODPODPA 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 (http://www.epa.gov/ozone/science/ods/index.html) shows their ODPs, GWPs, and CAS numbers.	GWPGWPThe 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.	ASHRAEASHRAEASHRAE 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	Further Information
Ammonia Absorption		N	0	0	B2	September 5, 1996; June 16, 2010	Acceptable
Ammonia Vapor Compression with Secondary Loop		N	0	0	B2	September 5, 1996; June 16, 2010	Acceptable
Desiccant Cooling		N	0	N/A	N/A	June 16, 2010	Acceptable	Not originally listed under scroll chillers.
Evaporative Cooling		N	0	N/A	N/A	September 5, 1996; June 16, 2010	Acceptable
FOR12A	FOR12A	R/N	0	1,100	A1	December 18, 2000; December 1, 2016	Unacceptable in new equipment, except as otherwise allowed under a narrowed use limit, as of January 1, 2024.	Originally listed under reciprocating chillers only.
FOR12B	FOR12B	R/N	0	1,000	A1	December 18, 2000; December 1, 2016	Unacceptable in new equipment, except as otherwise allowed under a narrowed use limit, as of January 1, 2024.	Originally listed under reciprocating chillers only.
RB-276	Free Zone, HCFC Blend Delta	R/N	0.013	1,592	A1	September 5, 1996	Acceptable	Originally listed under reciprocating chillers only.
Freeze 12	Freeze 12	R/N	0.013	1,606	A1	September 5, 1996	Acceptable	Originally listed under reciprocating chillers only.
R-1224yd(Z)	AMOLEA™ yd	R/N	0.00012	1	A1	November 25, 2019	Acceptable
R-416A	FRIGC FR-12, HCFC Blend Beta	R/N	0.009	1,081	A1	February 8, 1996; February 24, 1998	Acceptable	Originally listed under reciprocating chillers only.
G2018C	G2018C	R/N	0.053	1,731	A1	September 5, 1996	Acceptable	Originally listed under reciprocating chillers only.
GHG-HP	HCFC Blend Lambda	R/N	0.056	1,893	A1	February 8, 1996	Acceptable	Originally listed under reciprocating chillers only.
R-414A	GHG-X4, Autofrost, Chill-it, HCFC Blend Xi	R/N	0.045	1,478	A1	September 5, 1996	Acceptable	Originally listed under reciprocating chillers only.
GHG-X5	GHG-X5	R/N	0.032	2,377	A1	June 3, 1997	Acceptable	Originally listed under reciprocating chillers only.
HCFC-22		N	0.055	1,810	A1	March 18, 1994	Acceptable	Originally listed under reciprocating chillers only.
HCFC-22/HCFC-142b		R/N	0.055-0.065	1,810-2,310	A1	June 3, 1997	Acceptable	Originally listed under reciprocating chillers only.
HFC-134a		R/N	0	1,430	A1	March 18, 1994; June 16, 2010; December 1, 2016	Unacceptable in new equipment, except as otherwise allowed under a narrowed use limit for military marine vessels and human-rated spacecraft and related support equipment, as of January 1, 2024.	Not originally listed under scroll chillers.
HFC-227ea		N	0	3,220	A1	March 18, 1994; June 16, 2010; December 1, 2016	Unacceptable in new equipment, except as otherwise allowed under a narrowed use limit, as of January 1, 2024.	Not originally listed under scroll chillers.
HFO-1234ze	Solstice® 1234ze	N	0	6	A2L	August 10, 2012	Acceptable
HFO-1336mzz(Z) ((Z)-1,1,1,4,4,4-hexafluorobut-2-ene)	Opteon® MZ	N	0	9	A1	May 23, 2016	Acceptable
HFO-1336mzz(Z)/dichloroethylene blend (R-514A)	Opteon® XP30	R/N	0.00006	7	B1	May 23, 2016	Acceptable
R-414B	Hot Shot, Kar Kool, HCFC Blend Omicron	R/N	0.098	3,337	A1	September 5, 1996	Acceptable	Originally listed under reciprocating chillers only.
Ikon A	Ikon-12, Blend Zeta	N	0	N/A	A1	June 19, 2000	Acceptable
Ikon B		R/N	0	N/A	A1	December 6, 1999	Acceptable	Originally listed under reciprocating chillers only.
R-125/R-134a/R-600a (28.1/70.0/1.9)	NU-22 old composition	R/N	0	1,990	A1	June 16, 2010; December 1, 2016	Unacceptable in new equipment, except as otherwise allowed under a narrowed use limit, as of January 1, 2024.	Not originally listed under scroll chillers.
R-125/R-290/R-134a/R-600a (55.0/1.0/42.5/1.5)	ICOR AT-22	R/N	0	2,530	A1	March 29, 2006; June 16, 2010; December 1, 2016	Unacceptable in new equipment, except as otherwise allowed under a narrowed use limit, as of January 1, 2024.	Not originally listed under scroll chillers.
R-1270 (Propylene)		N	0	1.8	A3	December 1, 2016	Unacceptable as of January 3, 2017.
R-401A	SUVA MP-39	R/N	0.037	1,182	A1	January 13, 1995	Acceptable	Originally listed under reciprocating chillers only.
R-401B	SUVA MP-66	R/N	0.040	1,288	A1	January 13, 1995	Acceptable	Originally listed under reciprocating chillers only.
R-404A	SUVA HP-62	R/N	0	3,920	A1	December 20, 2002; December 1, 2016	Unacceptable in new equipment, except as otherwise allowed under a narrowed use limit for human-rated spacecraft and related support equipment, as of January 1, 2024.	Not originally listed under scroll chillers.
R-407C	Suva 407C, Klea 407C	R/N	0	1,770	A1	February 8, 1996; December 20, 2002; August 21, 2003; December 1, 2016	Unacceptable in new equipment, except as otherwise allowed under a narrowed use limit, as of January 1, 2024.	Not originally listed under scroll chillers.
R-410A	AZ-20, SUVA 9100, Puron	N	0	2,090	A1	February 8, 1996; December 20, 2002; December 1, 2016	Unacceptable in new equipment, except as otherwise allowed under a narrowed use limit, as of January 1, 2024.	Not originally listed under scroll chillers.
R-410B		N	0	2,230	A1	February 8, 1996; June 16, 2010; December 1, 2016	Unacceptable in new equipment, except as otherwise allowed under a narrowed use limit, as of January 1, 2024.	Not originally listed under scroll chillers.
R-411A		R/N	0.048	1,600	A2	February 8, 1996	Acceptable	Originally listed under reciprocating chillers only.
R-411B		R/N	0.052	1,700	A2	February 8, 1996	Acceptable	Originally listed under reciprocating chillers only.
R-417A	ISCEON 59, NU-22	R/N	0	2,350	A1	December 6, 1999; June 16, 2010; December 1, 2016	Unacceptable in new equipment, except as otherwise allowed under a narrowed use limit, as of January 1, 2024.	Not originally listed under scroll chillers.
R-417C	Hot Shot 2	R	0	1,820	A1	October 4, 2011	Acceptable	Not originally listed under scroll chillers.
R-420A	Choice R-420A	R/N	0.008	1,536	A1	October 1, 2004	Acceptable	Not originally listed under scroll chillers.
R-421A	Choice R-421A	R/N	0	2,630	A1	September 28, 2006; June 16, 2010; December 1, 2016	Unacceptable in new equipment, except as otherwise allowed under a narrowed use limit, as of January 1, 2024.	Not originally listed under scroll chillers.
R-422B	ICOR XAC1, NU-22B	R/N	0	2,530	A1	March 29, 2006; June 16, 2010; December 1, 2016	Unacceptable in new equipment, except as otherwise allowed under a narrowed use limit, as of January 1, 2024.	Not originally listed under scroll chillers.
R-422C	ICOR XLT1	R/N	0	3,390	A1	March 29, 2006; June 16, 2010; December 1, 2016	Unacceptable in new equipment, except as otherwise allowed under a narrowed use limit, as of January 1, 2024.	Not originally listed under scroll chillers.
R-422D	ISCEON MO29	R/N	0	2,730	A1	September 28, 2006; June 16, 2010; December 1, 2016	Unacceptable in new equipment, except as otherwise allowed under a narrowed use limit, as of January 1, 2024.	Not originally listed under scroll chillers.
R-424A	RS-44	R/N	0	2,440	A1	September 28, 2006; June 16, 2010; December 1, 2016	Unacceptable in new equipment, except as otherwise allowed under a narrowed use limit, as of January 1, 2024.	Not originally listed under scroll chillers.
R-427A	Forane 427A	R	0	2,140	A1	January 2, 2009; June 16, 2010	Acceptable	Not originally listed under scroll chillers.
R-434A	RS-45	R/N	0	3,250	A1	October 4, 2007; June 16, 2010; December 1, 2016	Unacceptable in new equipment, except as otherwise allowed under a narrowed use limit, as of January 1, 2024.	Not originally listed under scroll chillers.
R-437A	KDD6, ISCEON MO49 Plus	R/N	0	1,810	A1	January 2, 2009; December 1, 2016	Unacceptable in new equipment, except as otherwise allowed under a narrowed use limit, as of January 1, 2024.	Not originally listed under scroll chillers.
R-438A	KDD5, ISCEON MO99	R/N	0	2,270	A1	October 4, 2007; June 16, 2010; December 1, 2016	Unacceptable in new equipment, except as otherwise allowed under a narrowed use limit, as of January 1, 2024.	Not originally listed under scroll chillers.
R-443A		N	0	2.5	A3	December 1, 2016	Unacceptable as of January 3, 2017.
R-450A	Solstice® N-13	R/N	0	601	A1	October 21, 2014	Acceptable
R-507, R-507A	AZ-50	R/N	0	3,990	A1	September 5, 1996; December 20, 2002; December 1, 2016	Unacceptable in new equipment, except as otherwise allowed under a narrowed use limit, as of January 1, 2024.
R-513A	Opteon® XP 10	R/N	0	630	A1	July 16, 2015	Acceptable
R-515B		N	0	287	A1	December 11, 2020	Acceptable
R-744 (Carbon Dioxide, CO2)		N	0	1	A1	May 23, 2016	Acceptable
RS-44 (2003 formulation)		R/N	0	2,420	A1	June 16, 2010; December 1, 2016	Unacceptable in new equipment, except as otherwise allowed under a narrowed use limit, as of January 1, 2024.	Not originally listed under scroll chillers.
SP34E	SP34E	R/N	0	<1,470	A1	December 18, 2000; June 16, 2010; December 1, 2016	Unacceptable in new equipment, except as otherwise allowed under a narrowed use limit, as of January 1, 2024.	Not originally listed under scroll chillers.
Stirling Cycle		N	0	N/A	N/A	June 16, 2010	Acceptable	Not originally listed under scroll chillers.
THR-02		R/N	0	N/A	A1	December 6, 1999	Acceptable	Originally listed under reciprocating chillers only.
THR-03		R/N	0	N/A	A1	December 6, 1999; December 1, 2016	Unacceptable in new equipment, except as otherwise allowed under a narrowed use limit, as of January 1, 2024.	Originally listed under reciprocating chillers only.

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