I have a two story apartment with only one room upstairs and an access to a terrasse (it's kind of a closed mezzanine). I noticed that even when every window in the apartment is open, the room upstairs still feels stuffy. I believe it might be because there is only one window upstairs and it's not even in that room so the air upstairs just doesn't circulate well.
Hence my idea to install a vent/extractor (bathroom style, maybe more silent) blowing air from that room into the attic in order to get some air flowing upstairs. I know it's bad to blow humid air from a bathroom into an attic but this is just a regular room so I wonder if it would be okay (attic is well ventilated, we even asked the contractor to add more vents up there last time they did the roofing). I would probably only use it in the summer since the point is to ventilate better instead of using the AC. We get cold winters here (Montreal) so I imagine that blowing air in the winter would create condensation which would be bad.
Here is what the apartment looks like. The orange square is a patio door, green rectangles are roof vents and the red arrow is where I want to put my fan.
what do you guys think? Stupid idea? Anybody has a better idea?