Upon arrival customer stated that multiple vents had biological growth build up around them. I visually inspected the vents and found that with every single one growth was present. Company came and installed new flexible duct but left existing registers and mixing boxes. All registers were leaking in between the ceiling and vent causing condensation build up and growth. Mixing boxes in the attic were seeping with air and causing flex’s to sweat. Moving forward Corey is scheduled on Monday anytime after 2 to quote new registers, mixing boxes, and vents. Air Handler evaporator coil is also extremely impacted with growth and will require a pull and clean to be properly sanitized. I also recommended installing a pure air UV system with electrostatic air cleaner to completely combat any further growth on the evaporator coil or supply duct system. I also found that system had no float switch installed in the event of a drain line backup without a float switch the system will flood right ov