The invention has the object of providing an air-conditioning system for motor vehicles or the like, with two separate and independent refrigerating circuits having heat exchangers on the same air flow line, one of the two circuits having its compressor that receives mechanical power from the vehicle engine and thereby can be used when the motor vehicle itself is running, and the other circuit has the relevant compressor that receives mechanical power from an electrical motor which in turn receives power from the mains current and is instead usable during the stop when the vechicle is parked.
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