While much interest is being directed to so-called “natural” refrigerants such as CO2, HCs, and ammonia, attention is also being paid to HCFCs and HFCs, as they remain the dominant refrigerants in HVACR systems in North America. A recent wave of published reports focuses on new ways to monitor HCFCs during their phaseout period, HFCs in terms of their long-term potential, and how Canada is dealing with the disposal of unwanted refrigerants.