I just moved to a new town and the Wife and I are renting one of these "three-story" townhouses and have discovered the heating is just whacked. It's forced hot air (natural gas). There's a ten degree difference between the first and third floors, and I don't know what to do.
The first floor contains a garage and family room, which is ~66F day and night.
The second floor is the main living level - a living room/dining room over the garage and a kitchen/dining area over the family room. Temp in the living room is ~68F. The thermostat is on the wall in the doorway between LR/DR and kitchen and is always set to 71F.
The third floor is three bedrooms, 2 small and one master with cathedral ceiling and ceiling fan. The upstairs registers are always closed. The temp avgs. 75F during the day and bumps to 77-78F in the morning. The MBR faces east, as does the kitchen.
The HVAC has no zones - just the usual aluminum-faced fiberglass ductwork going to the upper floors - so I can't control what heated air goes where short of closing registers. None of the air returns are blocked on any of the three levels, so I don't believe it's that, and a sheet of paper does get sucked against the returns when the heat is running.
Since this is a rental and I can't go cutting into ductwork and the like to install zones, short of getting space heaters, do I have any options to reduce the temp in the bedrooms a bit? Even though the ceiling of the garage is insulated, could we be losing heat through the living room floor, and that's why it's cooler, even in the afternoons when we get sun there?