Thermostatic fan is controlled by setting the dial to the desired temperature. The fan has an integrated sensor inside of the fan to sense the temperature of the airflow every 1.5 minutes. When the airflow temperature is warmer than the dial setting, the fan will automatically speed up. If the airflow is cooler then the set point, the fan will automatically slow down. This thermostatic fan will maintain airflow at the low speed until higher speed is required. No remote sensors, no problem!