By simply pressing the single "Mode" button, the fan can be operated in any of its modes. With each press of the button, the mode will change as indicated by the lit LEDs (Light Emitting Diodes). The modes include low or high manual (the fan will constantly run) or low and high automatic (the fan will operate to maintain the set temperature displayed by the LED). The set temperatures include 60, 65, 70, 75 or 80 degrees Fahrenheit. The fan is turned off by either holding the button down for two seconds or continually pressing the button until the "Off" mode is reached (this is after High/80f).
Thermostats are designed to measure the ambient air temperature near the fan and compare it to the temperature setting you selected. The thermostat will respond by turning the fan on or off accordingly. Fans circulate the air, but do not change the existing temperature of the air.

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.