Choosing the Right HVAC Refrigerant: R-454B vs R-32
As the HVAC industry moves away from R-410A, two refrigerants have emerged as the primary replacements: R-454B and R-32. Here is what each one is and which one matters for most North Houston homeowners.
Why R-410A Is Being Replaced
R-410A has a global warming potential (GWP) of 2,088. Under the EPA's AIM Act, R-410A production was significantly restricted starting January 1, 2025. New residential equipment must use lower-GWP refrigerants.
R-454B (Puron Advance) — Carrier's Choice
- GWP: 466 — about 78% lower than R-410A
- Safety classification: A2L — mildly flammable under specific conditions
- Designed for: Standard split AC systems and heat pumps
- Adoption: Carrier, Trane, and most major U.S. residential HVAC manufacturers
R-32 — Used by Mini-Split Manufacturers
- GWP: 675 — lower than R-410A but higher than R-454B
- Safety classification: A2L — same classification as R-454B
- Adoption: Common in ductless mini-splits from Mitsubishi, Daikin, Fujitsu
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Which One Matters for Spring, TX Homeowners?
For standard central split AC systems in North Houston, R-454B is the relevant refrigerant. Carrier — the most widely installed brand in the area — uses R-454B in new equipment. R-32 is more relevant if you are considering a ductless mini-split system.
Bottom line: New Carrier central AC systems in 2025+ use R-454B. This is a positive transition — lower environmental impact and long-term supply security. R-410A systems you already own can still be serviced.
Related: R-410A vs R-454B Guide · R32 vs R454B Benefits
