Air conditioning system and heat pump: high efficiency through using CO2 as a coolant
During the colder months, the roof-mounted air conditioning system is used in addition as a heat pump, so ensuring effective and efficient climate control for the passenger compartment. The use of CO2 as a coolant brings further benefits. Its very efficient use of the heat pump, even at temperatures as low as minus 10 degrees Celsius, is particularly impressive. And, should there be a release of coolant, unlike some other materials it is environmentally harmless, non-toxic and non-flammable. Mercedes-Benz uses CO2 as a coolant as standard in the Citaro, making it one of the first bus manufacturers to do so.