Probably, the majority will be at a loss how you can open the opening of the windows in the winter, because all this can lead directly to the cooling of housing and also heating devices. But you need to know that for the full installation of a brand new window will go about an hour and a half. In this case, the opening will be in the open state only for thirty minutes. For this short time in the room, it will naturally become colder, but he will not have time to freeze fortunately