Definition
R-454B is a refrigerant blend of R-32 and R-1234yf used in many new residential air conditioners and heat pumps as a lower-global-warming replacement for R-410A. EPA's reference table lists its GWP at 465, under the limit of 700 for new residential systems. It is classified A2L, meaning lower toxicity and lower flammability.
Why it matters to you.
Some manufacturers use R-454B and others use R-32, so two quotes for a new system in Danville or nearby towns may specify different refrigerants. Both meet the federal limit; what matters more is that indoor and outdoor components are matched and installed to the safety standard.
Practical guidance.
Note which refrigerant each quote specifies and confirm the components are a matched set for it. R-454B, R-32 and R-410A are not interchangeable, so every future repair must use the refrigerant on the data plate.
About this definition
Written by the Feistritzer Heating & Air Conditioning team — family owned and operated in Danville since 1976, Kentucky HVAC license M02584. Definitions inform; a whole-system diagnosis in your home decides.