Check Windows for Gaps
Cold and damp conditions can cause window frames to swell, so once they return to their original size, it can create gaps. Not only will this let in drafts, but it will also cost you a lot in lost energy. If you wait too long, you could also end up needing to replace the frames completely, which is an expensive job.
“Gaps can be filled using a variety of materials, such as mortar, frame sealant, and decorators caulk,” Gesuelli says. “But generally you should use the same material that was previously used to seal the windows for the best result.”