To turn the fan of a Lennox air conditioner on high, locate the thermostat, find the fan setting on the thermostat screen and change the setting. This process takes approximately 3 minutes and requires access to the thermostat.Continue Reading
Locate the thermostat in the area being cooled. If the thermostat is locked inside a box, obtain the key and open the box.
Find the fan setting on the thermostat control screen. This setting will be separate from the temperature control.
Touch the appropriate control on the screen to accomplish the desired fan setting.