Substitutes in Remote Condensing Units
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 acceptableThis 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 unacceptableThis 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.
Many acceptable substitutes under SNAP may be restricted under the Technology Transitions Program. For more information on Technology Transitions Program restrictions, visit: https://www.epa.gov/climate-hfcs-reduction/technology-transitions-program
Note: SNAP-related information published in the Federal Register takes precedence over all information on this page.
| Filters | |||||||
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| Substitute | Trade Name(s) | Retrofit/New | ODPA 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. | GWPThe 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. | ASHRAE Designation (Safety Classification) |
SNAP Listing Date | Listing Status |
| Ammonia Vapor Compression with Secondary Loop | N | 0 | 0 | B2 | March 18, 1994; September 5, 1996 |
Acceptable | |
| FOR12A | FOR12A | R/N | 0 | 1,100 | A1 | December 18, 2000 (pdf) (257 KB) | Acceptable |
| FOR12B | FOR12B | R/N | 0 | 1,000 | A1 | December 18, 2000 (pdf) (257 KB) | Acceptable |
| RB-276 | Free Zone, HCFC Blend Delta | R/N | 0.013 | 1,592 | A1 | September 5, 1996 | Acceptable |
| Freeze 12 | Freeze 12 | R/N | 0.013 | 1,606 | A1 | September 5, 1996 | Acceptable |
| R-416A | FRIGC FR-12, HCFC Blend Beta | R/N | 0.009 | 1,081 | A1 | February 8, 1996 (pdf) (151 KB); February 24, 1998 (pdf) (140 KB) |
Acceptable |
| G2018C | G2018C | R/N | 0.053 | 1,731 | A1 | September 5, 1996 | Acceptable |
| GHG-HP | HCFC Blend Lambda | R/N | 0.056 | 1,893 | A1 | February 8, 1996 (pdf) (151 KB) | Acceptable |
| R-414A | GHG-X4, Autofrost, Chill-it, HCFC Blend Xi | R/N | 0.045 | 1,478 | A1 | September 5, 1996 | Acceptable |
| GHG-X5 | GHG-X5 | R/N | 0.032 | 2,377 | A1 | June 3, 1997 (pdf) (133 KB) | Acceptable |
| HCFC-22 | R/N | 0.055 | 1,810 | A1 | March 18, 1994 | Acceptable | |
| HCFC-22/HCFC-142b | R/N | 0.055-0.065 | 1,810-2,310 | A1 | June 3, 1997 (pdf) (133 KB) | Acceptable | |
| HFC-134a | R/N | 0 | 1,430 | A1 | March 18, 1994 | Acceptable | |
| HFC-134a/HBr (92/8) | N | 0.0016 | N/A | A1 | May 23, 2001 (pdf) (144 KB) | Acceptable: Only acceptable for use as the primary heat transfer fluid in secondary-loop equipment for not-in-kind replacements. | |
| HFC-227ea | N | 0 | 3,220 | A1 | March 18, 1994; July 20, 2015 (pdf) (686 KB) |
Unacceptable in new equipment as of January 1, 2017. | |
| HFE-449s1 (methoxynonafluorobutane, iso and normal) | Novec™ 7100 Engineered Fluid (HFE-7100) | N | 0 | 297 | A1 | December 18, 2000 (pdf) (257 KB); June 16, 2010 (pdf) (229 KB) |
Acceptable: Only acceptable for use as a secondary heat transfer fluid in not-in-kind systems. |
| HFE-569sf2 (ethoxynonafluorobutane, iso and normal) | Novec™ 7200 Engineered Fluid (HFE-7200) | N | 0 | 59 | N/A | December 18, 2000 (pdf) (257 KB); June 16, 2010 (pdf) (229 KB) |
Acceptable: Only acceptable for use as a secondary heat transfer fluid in not-in-kind systems. |
| R-414B | Hot Shot, Kar Kool, HCFC Blend Omicron | R/N | 0.098 | 3,337 | A1 | September 5, 1996 | Acceptable |
| R-417C | Hot Shot 2 | R | 0 | 1,820 | A1 | October 4, 2011 (pdf) (200 KB) | Acceptable |
| Ikon A | Ikon-12, Blend Zeta | R/N | 0 | N/A | A1 | June 19, 2000 (pdf) (223 KB) | Acceptable |
| Ikon B | R/N | 0 | N/A | A1 | December 6, 1999 (pdf) (225 KB) | Acceptable | |
| 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 | June 16, 2010 (pdf) (229 KB) | Acceptable |
| R-401A | SUVA MP-39 | N | 0.037 | 1,182 | A1 | January 13, 1995 (pdf) (185 KB) | Acceptable |
| R-401B | SUVA MP-66 | N | 0.040 | 1,288 | A1 | January 13, 1995 (pdf) (185 KB) | Acceptable |
| R-402A | HP-80 | R/N | 0.019 | 2,746 | A1 | March 18, 1994 | Acceptable |
| R-402B | HP-81 | R/N | 0.03 | 2,379 | A1 | March 18, 1994 | Acceptable |
| R-404A | SUVA HP-62 | R/N | 0 | 3,920 | A1 | March 18, 1994; December 20, 2002 (pdf) (168 KB); July 20, 2015 (pdf) (686 KB) |
Unacceptable in retrofit equipment as of July 20, 2016. Unacceptable in new equipment as of January 1, 2018. |
| R-406A | GHG-12, GHG-X3, McCool, Autofrost X3 | R | 0.057 | 1,900 | A2 | August 26, 1994 | Acceptable |
| R-407A | Klea 60, Klea 407A | R/N | 0 | 2,110 | A1 | August 26, 1994; January 2, 2009 (pdf) (173 KB) |
Acceptable |
| R-407B | Klea 61 | R/N | 0 | 2,800 | A1 | August 26, 1994; June 16, 2010 (pdf) (229 KB); July 20, 2015 (pdf) (686 KB) |
Unacceptable in retrofit equipment as of July 20, 2016. Unacceptable in new equipment as of January 1, 2018. |
| R-407C | Suva 407C, Klea 407C | R/N | 0 | 1,770 | A1 | February 8, 1996 (pdf) (151 KB); December 20, 2002 (pdf) (168 KB); August 21, 2003 (pdf) (160 KB) |
Acceptable |
| R-407F | Genetron Performax LT | R/N | 0 | 1,820 | A1 | October 4, 2011 (pdf) (200 KB) | Acceptable |
| R-407H | R/N | 0 | 1,500 | A1 | July 21, 2017 (pdf) (314 KB) | Acceptable | |
| R-408A | HCFC Blend Epsilon | R | 0.026 | 3,152 | A1 | August 26, 1994 | Acceptable |
| R-409A | HCFC Blend Gamma | R | 0.047 | 1,558 | A1 | August 26, 1994 | Acceptable |
| R-410A | AZ-20, Suva 9100, Puron | N | 0 | 2,090 | A1 | February 8, 1996 (pdf) (151 KB); December 20, 2002 (pdf) (168 KB) |
Acceptable |
| R-410B | N | 0 | 2,230 | A1 | February 8, 1996 (pdf) (151 KB); June 16, 2010 (pdf) (229 KB) |
Acceptable | |
| R-411A | R/N | 0.048 | 1,600 | A2 | February 8, 1996 (pdf) (151 KB) | Acceptable | |
| R-411B | R/N | 0.052 | 1,700 | A2 | February 8, 1996 (pdf) (151 KB) | Acceptable | |
| R-417A | ISCEON 59, NU-22 | R/N | 0 | 2,350 | A1 | December 6, 1999 (pdf) (225 KB); December 20, 2002 (pdf) (168 KB); June 16, 2010 (pdf) (229 KB) |
Acceptable |
| R-420A | Choice R-420A | R/N | 0.008 | 1,536 | A1 | October 1, 2004 (pdf) (186 KB) | Acceptable |
| R-421A | Choice R-421A | R/N | 0 | 2,630 | A1 | September 28, 2006 (pdf) (182 KB); June 16, 2010 (pdf) (229 KB) |
Acceptable |
| R-421B | Choice R-421B | R/N | 0 | 3,190 | A1 | September 28, 2006 (pdf) (182 KB); June 16, 2010 (pdf) (229 KB); July 20, 2015 (pdf) (686 KB) |
Unacceptable in retrofit equipment as of July 20, 2016. Unacceptable in new equipment as of January 1, 2018. |
| R-422A | ISCEON 79 | R/N | 0 | 3,140 | A1 | October 1, 2004 (pdf) (186 KB); July 20, 2015 (pdf) (686 KB) |
Unacceptable in retrofit equipment as of July 20, 2016. Unacceptable in new equipment as of January 1, 2018. |
| R-422B | ICOR XAC1, NU-22B | R/N | 0 | 2,530 | A1 | March 29, 2006 (pdf) (181 KB) | Acceptable |
| R-422C | ICOR XLT1 | R/N | 0 | 3,390 | A1 | March 29, 2006 (pdf) (181 KB); June 16, 2010 (pdf) (229 KB); July 20, 2015 (pdf) (686 KB) |
Unacceptable in retrofit equipment as of July 20, 2016. Unacceptable in new equipment as of January 1, 2018. |
| R-422D | ISCEON MO29 | R/N | 0 | 2,730 | A1 | September 28, 2006 (pdf) (182 KB); June 16, 2010 (pdf) (229 KB); July 20, 2015 (pdf) (686 KB) |
Unacceptable in retrofit equipment as of July 20, 2016. Unacceptable in new equipment as of January 1, 2018. |
| R-424A | RS-44 | R/N | 0 | 2,440 | A1 | September 28, 2006 (pdf) (182 KB); June 16, 2010 (pdf) (229 KB) |
Acceptable |
| R-426A | RS-24 | R/N | 0 | 1,510 | A1 | September 28, 2006 (pdf) (182 KB); June 16, 2010 (pdf) (229 KB) |
Acceptable |
| R-427A | Forane® 427A | R | 0 | 2,140 | A1 | January 2, 2009 (pdf) (173 KB); June 16, 2010 (pdf) (229 KB) |
Acceptable |
| R-428A | RS-52 | R/N | 0 | 3,610 | A1 | October 4, 2007 (pdf) (163 KB); July 20, 2015 (pdf) (686 KB) |
Unacceptable in retrofit equipment as of July 20, 2016. Unacceptable in new equipment as of January 1, 2018. |
| R-434A | RS-45 | R/N | 0 | 3,250 | A1 | October 4, 2007 (pdf) (163 KB); June 16, 2010 (pdf) (229 KB); July 20, 2015 (pdf) (686 KB) |
Unacceptable in retrofit equipment as of July 20, 2016. Unacceptable in new equipment as of January 1, 2018. |
| R-437A | KDD6, ISCEON MO49 Plus | R/N | 0 | 1,810 | A1 | January 2, 2009 (pdf) (173 KB) | Acceptable |
| R-438A | KDD5, ISCEON MO99 | R/N | 0 | 2,270 | A1 | October 4, 2007 (pdf) (163 KB); June 16, 2010 (pdf) (229 KB) |
Acceptable |
| R-442A | RS-50 | R/N | 0 | 1,890 | A1 | July 21, 2017 (pdf) (314 KB) | Acceptable |
| R-471A | Solstice® N71 | R/N | 0 | 144 | A1 |
September 8, 2023 (pdf) (246 KB) December 11, 2024 (pdf) (300 KB) |
Acceptable |
| R-515B | Solstice® N15 | N | 0 | 287 | A1 | September 8, 2023 (pdf) (246 KB) | Acceptable |
| R-452A | Opteon™ XP44 | R/N | 0 | 2,140 | A1 | July 21, 2017 (pdf) (314 KB) | Acceptable |
| R-452C | Forane® 452C | R/N | 0 | 2,200 | A1 | July 21, 2017 (pdf) (314 KB) | Acceptable |
| R-453A | RS-70 | R/N | 0 | 1,770 | A1 | July 21, 2017 (pdf) (314 KB) | Acceptable |
| R-458A | Bluon TdX 20 | R/N | 0 | 1,650 | A1 | July 21, 2017 (pdf) (314 KB) | Acceptable |
| R-507, R-507A | AZ-50 | R/N | 0 | 3,990 | A1 | March 18, 1994; December 20, 2002 (pdf) (168 KB); September 30, 2009 (pdf) (172 KB); July 20, 2015 (pdf) (686 KB) |
Unacceptable in retrofit equipment as of July 20, 2016. Unacceptable in new equipment as of January 1, 2018. |
| R-513A | Opteon™ XP 10 | R/N | 0 | 630 | A1 | July 16, 2015 (pdf) (353 KB) | Acceptable |
| R-744 (Carbon Dioxide, CO2) | N | 0 | 1 | A1 | September 30, 2009 (pdf) (172 KB) | Acceptable | |
| RS-24 (2002 formulation) | R/N | 0 | 1,510 | A1 | December 20, 2002 (pdf) (168 KB); June 16, 2010 (pdf) (229 KB) |
Acceptable | |
| RS-44 (2003 formulation) | R/N | 0 | 2,420 | A1 | June 16, 2010 (pdf) (229 KB) | Acceptable | |
| Self-chilling cans using CO2 | N | 0 | 1 | A1 | February 24, 1998 (pdf) (140 KB) | Acceptable | |
| SP34E | SP34E | R/N | 0 | <1,470 | A1 | December 18, 2000 (pdf) (257 KB); June 16, 2010 (pdf) (229 KB) |
Acceptable |
| THR-02 | R/N | 0 | N/A | A1 | December 6, 1999 (pdf) (225 KB) | Acceptable | |
| THR-03 | R/N | 0 | N/A | A1 | December 6, 1999 (pdf) (225 KB) | Acceptable | |
| THR-04 | R/N | >0 | N/A | A1 | June 8, 1999 (pdf) (142 KB) | Acceptable | |
| R-450A | Solstice® N-13 | R/N | 0 | 601 | A1 | October 21, 2014 (pdf) (345 KB) | Acceptable |
| R-448A | Solstice® N-40 | R/N | 0 | 1,387 | A1 | July 16, 2015 (pdf) (353 KB) | Acceptable |
| R-449A | Opteon™ XP 40 | R/N | 0 | 1,400 | A1 | July 16, 2015 (pdf) (353 KB) | Acceptable |
| R-449B | Forane® 449B | R/N | 0 | 1,412 | A1 | October 11, 2016 (pdf) (284 KB) | Acceptable |
| R-513A | Opteon™ XP 10 | R/N | 0 | 630 | A1 | July 16, 2015 (pdf) (353 KB) | Acceptable |
| HFO-1234yf | N | 0 | 1 | A2L | June 13, 2024 (pdf) (1,207 KB) | Acceptable subject to use conditions: See rule for detailed conditions. | |
| HFO-1234ze(E) | N | 0 | 1 | A2L | June 13, 2024 (pdf) (1,207 KB) | Acceptable subject to use conditions: See rule for detailed conditions. | |
| R-454A | Opteon™ XL40 | N | 0 | 237 | A2L | June 13, 2024 (pdf) (1,207 KB) | Acceptable subject to use conditions: See rule for detailed conditions. |
| R-454C | Opteon™ XL20 | N | 0 | 146 | A2L | June 13, 2024 (pdf) (1,207 KB) | Acceptable subject to use conditions: See rule for detailed conditions. |
| R-455A | Solstice® L40X | N | 0 | 146 | A2L | June 13, 2024 (pdf) (1,207 KB) | Acceptable subject to use conditions: See rule for detailed conditions. |
| R-457A | Forane® 457A | N | 0 | 137 | A2L | June 13, 2024 (pdf) (1,207 KB) | Acceptable subject to use conditions: See rule for detailed conditions. |
| R-516A | Forane® 516A | N | 0 | 140 | A2L | June 13, 2024 (pdf) (1,207 KB) | Acceptable subject to use conditions: See rule for detailed conditions. |
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