AC fans, or air conditioner fans, are used to draw air across a condenser coil or other heat exchanger in an air conditioning unit. This helps to dissipate the heat created by the refrigerant as it passes through the condenser. There are several types of AC fans, including centrifugal fans, axial fans, and propeller fans. All of these fans work by creating air movement, either by drawing air across the condenser, or by pushing air away from the condenser. AC fans are typically powered by electricity, but some are available in solar or battery-powered models.