I'm in a narrow, vertical, townhouse style three story house. My upstairs bedroom gets too hot, and downstairs gets too cold.
I found I could fix the downstairs problem by running the HVAC fan full time. I think it works because there are quite a few downstairs vents. The air intake and the thermostat are both on the second floor, and by leaving my fan running more air is mixed from the different floors.
However, my third floor consists of just a single bedroom and there's a single vent. The room is kind of "suspended" above my living room, which has a high ceiling.
What are my options for fixing the third floor problem? I wonder if I could install some kind of fan into the wall, that would blow hot air out of the third story bedroom and into the living room (as there's a shared wall), so it would pull cooler air up the stairs and into the bedroom. That way more mixing would occur and my room temperatures could average out.
Or is that a bad idea? Should I just hire someone to balance the vents?