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R-410A

R-410A is a refrigerant fluid used in air conditioning and heat pump applications. It is a zeotropic but near-azeotropic mixture of difluoromethane (CH2F2, called R-32) and pentafluoroethane (CHF2CF3, called R-125). R-410A is sold under the trademarked names AZ-20, EcoFluor R410, Forane 410A, Genetron R410A, Puron, and Suva 410A. Due to its high global warming potential, R410A is being phased out in several countries.

R-410A was invented and patented by Allied Signal (later Honeywell) in 1991. Other producers around the world have been licensed to manufacture and sell R-410A. R-410A was successfully commercialized in the air conditioning segment by a combined effort of Carrier Corporation, Emerson Climate Technologies, Inc., Copeland Scroll Compressors (a division of Emerson Electric Company), and Allied Signal. Carrier Corporation was the first company to introduce an R-410A-based residential air conditioning unit into the market in 1996 and holds the trademark "Puron".

In accordance with terms and agreement reached in the Montreal Protocol (The Montreal Protocol on Substances That Deplete the Ozone Layer), the United States Environmental Protection Agency mandated that production or import of R-22 along with other hydrochlorofluorocarbons (HCFCs) be phased out in the United States. In the EU and the US, R-22 could not be used in the manufacture of new air conditioning or similar units after 1 January 2010. In other parts of the world, the phase-out date varied from country to country. Since 1 January 2020, the production and importation of R-22 has been banned in the US; the only available sources of R-22 include that which has been stockpiled or recovered from existing devices.

By 2020, most newly manufactured window air conditioners and mini split air conditioners in the United States used refrigerant R-410A. Further, R-410A had largely replaced R-22 as the preferred refrigerant for use in residential and commercial air conditioners in Japan and Europe, as well as the United States.

Unlike alkyl halide refrigerants that contain bromine or chlorine, R-410A (which contains only fluorine) does not contribute to ozone depletion and therefore became more widely used as ozone-depleting refrigerants like R-22 were phased out. However, like methane, R-410A has a global warming potential (GWP) that is appreciably worse than CO2 (GWP = 1) for the time it persists. R-410A is a mixture of 50% HFC-32 and 50% HFC-125. HFC-32 has a 4.9 year lifetime and a 100-year GWP of 675 and HFC-125 has a 29-year lifetime and a 100-year GWP of 3500. The combination has an effective GWP of 2088, higher than that of R-22 (100-year GWP = 1810), and an atmospheric lifetime of nearly 30 years compared with the 12-year lifetime of R-22.

Since R-410A allows for higher SEER ratings than an R-22 system by reducing power consumption, the overall impact on global warming of R-410A systems can, in some cases, be lower than that of R-22 systems due to reduced greenhouse gas emissions from power plants. This assumes that the atmospheric leakage will be sufficiently managed. Under the assumption that preventing ozone depletion is more important in the short term than GWP reduction, R-410A is preferable to R-22.

Various countries started phase-out activities for hydrofluorocarbon refrigerants, including R410A, due to their high global warming potential.

On December 27, 2020, the United States Congress passed the American Innovation and Manufacturing (AIM) Act, which directs US Environmental Protection Agency (EPA) to phase down production and consumption of hydrofluorocarbons (HFCs). The AIM act was passed in compliance with the Kigali Amendment because HFCs have high global warming potential. Rules developed under the AIM Act require HFC production and consumption to be reduced by 85% from 2022 to 2036. R-410A will be restricted by this Act because it contains the HFC R-125. Other refrigerants with lower global warming potential will replace R-410A in most applications, just as R-410A replaced the earlier ozone-depleting refrigerant, R-22.

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