Engineering·8 min read·April 12, 2025

🧪 Refrigerant Transition: R-410A Phase-Out, R-454B, and What HVAC Engineers Need to Know

A practical guide to the refrigerant transition away from R-410A — why it is happening, what replacement refrigerants like R-454B and R-32 offer, equipment compatibility considerations, and the EPA AIM Act timeline for HVAC engineers and contractors.

📖Single-Family Residence HVAC Design Drawing Set (Full Access)

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Why R-410A Is Being Phased Out

R-410A has been the dominant refrigerant in commercial and residential HVAC systems since it replaced R-22 (Freon) in the 2000s. It is efficient, non-ozone-depleting, and well-understood by technicians. But it has a global warming potential (GWP) of approximately 2,088 — meaning a pound of R-410A released into the atmosphere has the same warming effect as 2,088 pounds of CO₂ over a 100-year period.

The EPA's American Innovation and Manufacturing (AIM) Act, enacted in 2020, mandates a phased reduction in the production and import of hydrofluorocarbons (HFCs) including R-410A. The AIM Act requires a 40% reduction in HFC production by 2024, scaling to an 85% reduction by 2036. As a practical matter, this means R-410A will no longer be manufactured in the United States for new equipment after January 1, 2025, and new refrigerant production will tighten further through the decade.<

Topics covered

R-410A phase outR-454B refrigerantrefrigerant transitionHFC phase downEPA AIM ActR-32 refrigerantA2L refrigerantlow GWP refrigerantHVAC refrigerant 2025refrigerant replacement