Upstairs system return and supplies are really close together. Supplies are in the middle of the bedrooms. Upstairs system is potentially leaking small amounts of refrigerant. Homeowners states system runs all summer long. Main floor system is zoned. Main floor doesn’t have static bypass. Main floor txt is not operating properly. main floor compressor is 2 stage and going into thermal overload in 2nd stage. Biological growth on main floor indoor coil. Main floor condensation vinyl tubing is collapsed. Heat exchanger could be potentially hazardous to the home. Found cracked eyelet. Recommend adding indoor air quality upgrades into both systems with Apco x.