Why Run an Air Conditioner or Heating Blower Fan Continuously?
There are reasons to leave the fan in the ON position on a heating or cooling system, but we do not recommend that you do this without first asking for advice from your heating and service technician. If your air conditioner or heating system fan blower unit was designed to permit the fan to run all of the time that’s great and you can consider the benefits of continuous fan operation we list just below. But if your fan motor was not intended for continuous duty and you run the fan that way, you may find the motor fails prematurely.