IN-VEHICLE TEMPERATURE ADJUSTMENT SYSTEM

An in-vehicle temperature adjustment system (1) includes: a refrigeration circuit (2) including an inter-medium heat exchanger (22) and a vaporizer (26, 27a) that vaporizes the cooling medium to achieve a refrigeration cycle by circulating a cooling medium; a thermal circuit (4) including a heater core (43), the inter-medium heat exchanger (22), an engine thermal circuit (5), and a radiator (42) to circulate the heating medium; and a controller (6) that controls a distribution state of the heating medium. The thermal circuit (4) includes: a first branch portion at which a coolant flowing out of the engine thermal circuit (5) and the inter-medium heat exchanger (22) is divided into coolants flowing into the heater core (43) and into the radiator (42); a second branch portion at which a coolant flowing out of the heater core (43) is divided into coolants flowing into the inter-medium heat exchanger (22) and into the engine thermal circuit (5); a first adjustment valve (44) and a second adjustment valve (45).