Temperature control system

A temperature control system comprising:

• an air-cooling target unit configured to be mounted on a vehicle, the air-cooling target unit being configured to generate heat when a current flows the air-cooling target unit, and being configured to be air-cooled;
• an air passage in which the air-cooling target unit is disposed and through which air that exchanges heat with the air-cooling target unit is to flow;
• an inside-air intake passage configured to acquire inside air and to supply the inside air to the air passage, the inside air being air inside the vehicle;
• an outside-air intake passage configured to acquire outside air, and to supply the outside air to the air passage, the outside air being air outside the vehicle;
• an intake opening/closing member configured to open and close between the air passage and the inside-air intake passage and open and close between the air passage and the outside-air intake passage;
• and
• a control device, wherein
• the control device comprises:
• one or more processors;
• and
• one or more memories coupled to the one or more processors, and
• the one or more processors are configured to perform a process comprising:
• determining whether transition of a temperature of the air-cooling target unit is in a rising trend;
• performing an intake air determination process of determining which of the inside air and the outside air is to be introduced into the air passage when it is determined that the transition of the temperature of the air-cooling target unit is in the rising trend;
• and
• refraining from performing the intake air determination process when it is determined that the transition of the temperature of the air-cooling target unit is not in the rising trend.