HCFCs have an ODP rating of 0.

Hydrochlorofluorocarbons (HCFCs) do not have an Ozone Depletion Potential (ODP) rating of 0; in fact, they have a non-zero ODP rating, which indicates that they do contribute to ozone depletion, albeit at a lower level than their predecessors, chlorofluorocarbons (CFCs). This characteristic is crucial because the international regulatory frameworks aimed at protecting the ozone layer, such as the Montreal Protocol, specifically target the phase-out of substances with higher ODPs.

While HCFCs were developed as transitional substitutes for CFCs and have been used in various applications, including refrigeration and air conditioning, the goal has been to eventually phase them out entirely due to their environmental impact. Thus, understanding their ODP ratings helps professionals in the HVAC field make informed choices about refrigerants that have less impact on ozone depletion.