R-22 will officially be phased out at the end of next year, and it is likely that HFCs will be phased down in the years ahead. For these reasons, many supermarket owners are starting to transition to lower-GWP refrigerants, particularly if they are still using HCFCs. Retrofitting an entire store with equipment that uses CO² or ammonia can be prohibitively expensive, which is why many store owners are choosing to transition their existing equipment to HFO blends.