R-22. The old standard.
Acting in accordance with an international treaty called the Montreal Protocol, the U.S. Environmental Protection Agency (EPA) has mandated the phaseout of R-22 through the Clean Air Act. As of 2010, the manufacture of systems using R-22 refrigerant will be prohibited, and by 2020 the production of R-22 itself must cease. The main reason for this regulatory action is that R-22 is a hydrochlorofluorocarbon (HCFC) compound, which contains ozone-depleting chlorine.
R-410A. The refrigerant of the future.
GC has now transitioned to the installation of cooling systems that use the EPA-recognized chlorine-free R-410A refrigerant. Because R-410A contains no chlorine, it is considered ozone-friendly. Today’s highest efficiency cooling systems are designed to use R-410A refrigerant, therefore providing an economic benefit in addition to the environmental benefit.