The use of R-744 (carbon dioxide/CO2) as a refrigerant in HVACR applications has been gaining attention. But it faces installation and servicing challenges for technicians familiar with fluorocarbon refrigerants. That’s why efforts are underway, especially in Europe, to formulate a certification program that involves such training. One of the most recent ones is Star Refrigeration’s learning project which includes the development of the first national vocational qualification for CO2 refrigeration in Europe.