I have just had my garage (which is integral to the house) converted to a room with the front double glazed. The windows have been in around one month I have noticed for the first time that the front of these windows (ie on the exterior) is misting up this evening. The mist can be wiped off. It was raining quite a lot today but the rain stopped around five hours ago. I cannot understand why these new windows are misting up, as the windows in the rest of the house do not mist up at all. Anybody any ideas, and whether there is a problem somewhere.