Mold in the AC Unit
Mold can show up almost anywhere in the home, including your AC unit. Once it invades your ductwork, mold spores are more easily spread throughout the entire house, which could make people sick if left to grow and proliferate.
There are quite a few things that can cause mold to develop in a home. A leaking roof, broken or leaking pipes, high humidity and poorly ventilated bathrooms are just a few examples of conditions that can cause mold.
With air conditioners, condensation is a byproduct of daily operation. Air conditioners are built with proper condensation drainage. When the drainage system is overloaded or not functioning properly, your air conditioning unit itself could be the cause of mold developing in your system and the ducts.