We moved in our current house 12 months ago, the living room has a hallway off it which is adjacent to the garage and shares the same flat roof.There is no heating in the hallway and only a single glazed window and we have a glass door between hall and livingroom.We get patches of damp in thehallway at winter.Would a de humidifier help until the window can be replaced, or would a small heater of some kind be the answer.