We have been getting damp in the bedroom below the window and along the top of the wall, someone has been in and replaced the window and has said that it is due to lack of ventilation in the room and that we should have the window slightly open. This seems to work however it is cold in the winter months so if it is cold and windy the options are to either freeze or risk more damp in the morning. This shouldnt be the case, I'd like to know what to do to solve this issue.
