For any number of reasons — energy efficiency, aesthetics, easier operation — many homeowners eventually decide to replace their old windows. Sometimes they make the move as part of a larger remodel; other times, it's a stand-alone job.

Generally speaking, there are three kinds of replacements: full-frame, sash, and insert. Over the years, my remodeling company has used all three methods, but we prefer insert replacements. They do the best job of maintaining the original look of the fenestration. Also, they aren't as invasive or labor-intensive as full-frame replacements, and...

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