R134a (1,1,1,2-Tetrafluoroethane – C₂H₂F₄) R134a is a common HFC (Hydrofluorocarbon) gas used to replace CFC and HCFC refrigerants. It does not damage the ozone layer (ODP = 0), but its use is restricted in some regions due to its global warming potential (GWP = 1.430). Pront R134a Air Conditioning Gas Types are listed below.