Do you lose more heat going up an open stairway from the stove room, or is the problem primarily the cold air coming down? My old house has the doorway to the stairs to the 2nd floor smack in the middle of the interior wall of the front room that goes across the entire front of the house, and I want to try closing it off and see how that affects heat on both floors. There's no actual door on it now, though there clearly used to be, so I'm thinking of hanging one of the big tough movers' blankets left behind by my movers a few years ago. The doorway is 7 feet top to bottom, and the blanket won't cover the whole thing but will leave about a one-foot gap top or bottom. Before I struggle to put this thing up, does it make more sense to leave the uncovered gap at the top to minimize cold air coming down, or at the bottom to minimize warm air going upstairs? It's a small house, and I keep the two small spare bedrooms closed in winter, so there's a single steep flight of stairs straight up, then a small hallway that immediately doubles back towards the front of the house, and my bedroom is off the far end of that. So I don't think the warm air that comes up the stairway reaches my bedroom much, so all I'm heating right now is the stairs and part of the hallway. My 2nd floor is unheated in any case, and my bedroom, which is directly over the stove, is actually less cold with the woodstove than it was using the boiler, so some heat is certainly coming up through the ceiling. Anyway, I'm thinking it makes little sense to be wasting heat on the stairway and having that cold draft coming right at the stove. Any thoughts?