A temperature-control system includes a temperature-control device (3), (n≧2) temperature-control assemblies (5, 5′) which are designed for conducting a temperature-control fluid (2) through a component (4) to be temperature-controlled, (n≧2) individual return line parts (7′, 7″) and (n≧2) return temperature sensors (8, 8′), a controller (9) having (n≧2) valves (10, 10′) and control elements (11, 11′) which are designed to adjust the respective associated valve (10, 10′), and a room temperature sensor (12) for determining and reporting an actual temperature (13) in an immediate environment of the component (4).