A couple decades ago or so, the standard refrigerant for air conditioners, R-12, was replaced, with R-134a. R-134a is likely to be replaced soon by R-1234yf, though concerns over the safety of the refrigerant have been raised by Daimler. Daimler finds R-1234yf refrigerant slightly susceptible to fire The auto industry is poised to introduce a Read on! →