By using the environmentally friendly refrigerant CO2 with a GWP of 1, all cooling requirements can be met safely, efficiently and in compliance with all the applicable standards and laws. As a high-pressure refrigerant with very good heat transfer qualities, CO2 can be used without major restrictions due to its classification as an A1 refrigerant. In the commercial refrigeration sector, where booster systems are very often used, it has become the standard refrigerant. CO2 is also used in industry, for example for storage cooling, and for heat pump processes. In addition, CO2 refrigeration systems are subsidizble according to BAFA guidelines for the promotion of refrigeration and air conditioning systems.