It Is Never a Good Idea for HVACR Techs to Mix Refrigerants

HFCs were created to take the place of HCFCs, but they, too, are being targeted for a phasedown and are likely to be replaced by HFO blends.

source https://www.achrnews.com/articles/139916-it-is-never-a-good-idea-for-hvacr-techs-to-mix-refrigerants