To seal windows for winter, start by cleaning the area around the window to ensure a good seal. Use weatherstripping to cover gaps around the window frame. For added insulation, apply window film or plastic sheeting to the inside of the window. These films can be secured with double-sided tape and then tightened with a hair dryer. Check for drafts and use caulk to seal any remaining gaps. Ensure all seals are secure to prevent cold air from entering.

Seal windows for winter by cleaning the area, applying weatherstripping, using window film or plastic sheeting, and caulking any gaps. This helps improve insulation and prevent drafts.