While supermarkets were first to make the shift from ozone depletion potential (ODP) refrigerants like chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) to the now commonplace hydrofluorocarbons (HFCs), the next step beyond f-gases is not as clear cut.
The phaseout of CFCs in the 1990s initially had store decision makers trying HCFCs in medium- and low-temperature applications — but moving to quickly embrace HFCs, with R-404 and R-507 being the most commonly used.