R454B is one of the leading next-generation refrigerants chosen to replace R410A in air conditioning and heat pump equipment. As the F-Gas phase-down tightens, understanding R454B is increasingly important for installers and engineers.
Key properties
- Type: Mildly flammable A2L blend (HFC/HFO)
- GWP: around 466 — roughly a quarter of R410A’s GWP of about 2088
- Applications: new split systems, VRF, chillers and heat pumps
Why R454B is replacing R410A
R410A has a high global warming potential, putting it firmly in the sights of the F-Gas phase-down. R454B offers similar performance and efficiency with a far lower GWP, making it a popular drop-in-class replacement for new equipment.
Working with R454B safely
As an A2L (lower flammability) refrigerant, R454B requires appropriate handling: leak detection, correct charge limits, and equipment rated for A2L use. Engineers should be trained in A2L safe-working practices and follow manufacturer guidance.
Frequently asked questions
Is R454B a drop-in for R410A? It is used in new R454B-designed equipment rather than as a straight retrofit into existing R410A systems.
Is R454B flammable? It is classified A2L — mildly flammable — so it requires A2L-rated equipment and safe handling.
Browse our full range of refrigerant gases in our online shop, or read more in our refrigerant gas blog.