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this post was submitted on 08 Apr 2025
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Cold air will enter the stairwell at the bottom. If it is cold outside, it will probably be at least a bit warmer in the stairwell, so the air will warm and rise to the top of the well. It's probably still cooler than in anyone's room, though so that will be what the 4th floor residents are noticing.
To air the well most effectively, I'd suggest opening a window at the bottom and at the top and maybe putting a heater at the bottom as well. That would cause the cold air entering at the bottom to rise more rapidly and then exit through the top window. This may not be particularly efficient from an energy use POV though.
With the top window open and the warmer air in the well the 4th floor may even get less of a draft doing this, as the air would be getting out that way instead - unless there was a wind blowing in through that top window.