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I live on the 6th floor of a building that has 10. It has a collective floor heating gas and has double glazing. The building dates back to the 1970s. Since the old windows were replaced by double glazing, there are traces of humidity at the ceilinged corner / north wall, despite the daily ventilation of the room.

It's not enough to open the windows. There are specific rules for ventilation after PVC windows are installed. Go to the site

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