The type of refrigerant used in an air conditioner depends on the the age of the system. If your AC system was built before 2010, it most likely runs on R-22 (Freon) refrigerant. However, since January 2020, Freon is no longer manufactured or imported. R-22 was found to be ozone-depleting, leading to the phase-out and replacement with the eco-friendlier R-410A.
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