The temperature sensor in a CPU air cooler is a vital component. It monitors the temperature of the CPU in real-time.

These sensors work based on principles such as thermistors, which change their electrical resistance with temperature changes. The sensor data is then transmitted to the motherboard or the computer's BIOS. This information is crucial for several reasons. Firstly, it allows the system to adjust the fan speed. If the temperature rises, the fans can spin faster to increase cooling. The accuracy of the temperature sensor is important. Inaccurate readings could lead to improper cooling. Some sensors have calibration mechanisms to ensure accurate temperature reporting. The location of the sensor also matters. It should be placed in a position that can accurately measure the CPU's core temperature. Advanced motherboards may have multiple temperature sensors to get a more comprehensive view of the CPU's thermal state. Additionally, software can access the sensor data to provide users with information about the CPU temperature. This enables users to monitor the system's thermal health and take appropriate actions if needed, such as cleaning the air cooler or upgrading the cooling solution.