Track difficult operation
Sticking, loose hardware or changing gaps can be documented by opening.
Record seal and finish condition
Weather seals, paint and caulking can be reviewed visually.
Separate comfort from diagnosis
Drafts or condensation can have several causes.
Keep replacement history
Window type, installation date and contractor records help later planning.
Safety boundary. This site is for planning, observation and records. Do not improvise electrical, fuel-burning, structural, roof-height or other hazardous work. Follow manufacturer instructions, applicable codes and qualified professional guidance.