What is R-410A & R-32?
R-410A is the refrigerant that has filled most residential ACs since the mid-2000s; R-32 (and R-454B) are the lower-global-warming-potential refrigerants replacing it in new equipment as of 2025 under the federal A2L transition. New systems use the new refrigerants; existing R-410A systems remain legal to run and service.
Why it matters in Arizona
What it means for an Greater Phoenix homeowner: R-410A itself isn't banned, but as production quotas tighten, repairs involving refrigerant on older systems will gradually cost more. On a 10+ year-old system, a major refrigerant-circuit repair is the natural moment to run the repair-vs-replace math.
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