If you have an oversized HVAC unit for the sq ft of the house, could it drop the temp so fast it leaves the moisture in the system and caused the unit and ducts to mold ? Is this possible? Thanks for your help

An oversized unit will not operate the proper amount of time to remove the humidity from the air before it satisifys

Keep in mind organic growth has to have 3 things to grow. 1. Temp 2. Moisture
3. Food. Metal of its self will not support organic growth as it is lacking the food but adding dirt to the metal then you have food to support growth;-)

Thanks Charley
Just needed some back up :smiley:

The furnace can short cycle if it is over sized. This can cause the heat exchanger to crack. You can also throw the efficiency out the window.

Thanks Jeff, never though about it from that side.