Before winter hits in Everett, I usually check for drafts around the frames, condensation between panes, and any soft spots in the sills. Even small issues can get worse once the rain and cold set in. I found https://www.screensandwindows.com/blog/diy-vs-professional-window-replacement-what-everett-homeowners-should-know helpful when trying to decide whether a repair is realistic or if it makes more sense to plan for a full replacement.