R-410A is a hydrofluorocarbon (HFC) refrigerant that became the standard for residential air conditioning and heat pumps after the phase-out of R-22 (Freon). It was used in virtually all new residential HVAC equipment from the early 2000s through 2024.
R-410A has a Global Warming Potential (GWP) of 2,088 — more than 2,000 times more potent than CO2 as a greenhouse gas. Under EPA regulations and the AIM Act, new residential HVAC equipment can no longer use R-410A as of January 2025.
Existing R-410A equipment will continue to operate and can be serviced, but the refrigerant is becoming increasingly expensive and harder to source. Homeowners with R-410A systems should expect higher service costs over time as the refrigerant is phased down.