Automotive air-conditioning system

An automotive air-conditioning system provided with: a thermal unit (11) having a condenser (16) and an evaporator (18) designed to be traversed by a refrigerant fluid; and a hydraulic circuit (6), which is designed to be traversed by a carrier fluid and has a first portion (13) provided with a first heat exchanger (7), a second portion (14) provided with a second heat exchanger (9), a hot portion (20) extending through the condenser (16), and a cold portion (21) extending through the evaporator (18); a valve device (22) being designed to connect selectively either the hot portion (20) or the cold portion (21) to the first portion (13) and the second portion (14).