[GHallof]

Hi Vicky maybe this will help. Two types of ducts. Warm Air and Cold Air. The vents with the foam are warm air. Air is pulled in through these up into the plenum of the AC Unit flows through the unit and then into the cold air duct. See below. To determine if your ducts are collapsed (I would start with the warm air) Remove the vent holding the foam, and then remove its base that holds it to the ceiling. Youll end up being able to see the rough opening. This opening will be, or at least should be taped (sealed) to the duct. Place your hand inside, in the middle, of the duct facing towards the AC unit. The ducts are made out of a foam material. Over time the top of the duct sags restricting air flow. See example in image. To fix. You can insert lengths of PVC to open the duct back up and restore air flow. Take your time and use caution not to rip the foam as you insert the PVC sections. Use 1.25" PVC in 9 or 10" sections. The idea is to open as much of the length of the duct as possible. The cold air ducts are more difficult but can be accomplished similarly.