Inspect windows for drafts, gaps, cracked caulk, and damaged weatherstripping
Clean the window frame, sash, and surrounding surfaces
Remove old, loose, or deteriorated caulk
Apply fresh exterior-grade caulk around the window frame where gaps exist
Replace worn weatherstripping around movable parts
Install or replace window film for added insulation
Use draft stoppers or foam tape for small gaps
Repair or replace damaged window panes or glazing putty
Add storm windows if needed
Check and seal gaps around trim, siding, and interior casing
Ensure locks and latches close windows tightly
Use insulated curtains or thermal blinds
Maintain seals and inspect windows regularly