What role does a set point play in a heating control system?

In a heating control system, the set point serves as the reference value or the desired operating temperature for the environment. It acts as the target input against which the actual output—the current room temperature—is continuously compared.1

The system utilizes sensing elements, such as a bimetallic strip in a thermostat, to monitor the room temperature. The controller then compares this measured value to the set point to determine the necessary action. If the room temperature falls below the set point, the controller activates the heater; once the temperature exceeds the set point, the controller turns the heater off. By constantly adjusting the process to minimize the difference between the actual output and the set point, the system maintains the desired temperature within a closed-loop feedback control framework.1