Complete 3 system furnace repair and preventative maintenance check. Found left side air handler and main air handler 17 years old with very dirty blower wheels and failing capacitor and zero water safety and concerning amounts of mold in systems. Recommend replacing both systems or cleaning blower wheels changing out capacitor adding float switches and adding UV inhibitors to the system to get the best performance and protect the home and air as well. The upstairs system is 6 years old and running well with no backup water safety. Recommend inline float switch to better protect the house.