12/12/2005 · This article has been excerpted from a comprehensive white paper, Refrigerants for Commercial Refrigeration Applications, issued by Copeland Corp., part of Emerson Climate Technologies. The article focuses on the criteria for refrigerant selection, Perfect Steerable Transfer Cartluding discussion of the transitional refrigerants (HCFCs), chlorine-free refrigerants (HFCs), and halogen-free refrigerants.