Two floor house, in the first floor great-room, we have a cathedral ceiling over half of it. Basically one half is covered by a regular height (8 ft) ceiling and the other half is open to the cathedral. The 8 ft ceiling is under a hallway upstairs which is also open to the cathedral ceiling (so its almost like a balcony).
There are 2 returns for the system, one on the floor of the great room area and one in the ceiling of the balcony/hallway upstairs (the balcony area runs half the length of the house, the rest is a normal hallway).
The issue we're having is that the return in the great room area seems to be sucking air downward from upstairs, and this creates a cool breeze in the great room area (naturally right where the couch is!). Since the upstairs is on a programmable t-stat, I only heat it up when we're up there and about to go to bed. Otherwise it stays around 65, with the living floor being set at 69.
Any suggestions on minimizing the breeze? I dont really want to heat the upstairs to 69 but if thats the best fix I wont mind doing so. Just interested in saving as much oil as possible