What is 422B Refrigerant Used For?

R-422B, also sold as NU-22B, is one of the retrofit refrigerants techs turn to when an R-22 air conditioner still has life left in it but R-22 is getting expensive. Its big draw is that, in most systems, it runs on the mineral oil already in the compressor. This guide covers what R-422B is, how it compares with R-22, what a retrofit involves, and how [...]