We removed a gable attic fan that was not working and replaced it with a new gable attic fan with new thermostat We removed the older attic fan going through the roof and replaced it with a new attic motor with 5 blades and a new thermostat We installed these attic fans on a single pole switch which acts as a emergency cut off switch We recommend leaving the thermostats set to 105 degrees to avoid the attic fans from burning up from constant usage