Refrigerant 22 became the refrigerant of choice for residential heat pump and air conditioning systems after the 1987 Montreal Protocols banned chlorofluorocarbon (CFC) refrigerants in 1987. R-22 contains no chlorine, which was considered the primary contributor to atmospheric ozone depletion that gave rise to the phase-out of CFCs worldwide. However, R-22 is in a class of substances called hydrofluorocarbons (HCFCs) that are believed to contribute to global warming as well as having some ozone-depletion potential. As a result, HCFCs have also been banned and are being phased out. Write a report detailing the U.S. phase-out schedule for R-22 and listing the refrigerants that are being used to replace R-22 in residential systems. Include at least three references.
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