R-744 Carbon Dioxide Refrigerant Fact & Info Sheet

R-744 Carbon Dioxide is one of the oldest refrigerants in the world. Its first usage can be traced all the way back to the nineteenth century. Before the popularity of CFC and HCFC refrigerants Carbon Dioxide was one of the most widely used refrigerants. Chances are if you went to a movie theatre in the 1920’s then you were experiencing an R-744 air conditioning system.