The problem is none of our rooms seem to ever get really warm. Especially the living area with the vaulted ceiling. The living room vents are at the apex of the vaulted ceiling and all the other vents throughout our home are located next to interior walls.The return is in a very short hallway (next to the living room) at one end of our home in the ceiling as well. I have been told this is fine. I have also been told that the proper placement should be next to outside walls in the floor since our return is in the ceiling. Also, because we should be heating the exterior walls since this is where the cool air is entering the home. Can anyone tell me should we look at moving them to the floor or are they truly fine?