The AccuTemp™ digital thermostats have an exclusive technology found only on Holmes® comfort appliances. For window fans, the AccuTemp™ digital thermostat measures the air temperature in your room, and then turns the fan off or on in order to maintain your programmed temperature. You can also use the LCD to read the current temperature. Customers demand energy efficient products that provide the best performance available. The AccuTemp™ technology allows you to maintain the precise comfort level you've selected while using energy more efficiently.