Replacing 20-year-old windows is generally worth it. Windows that old are likely single or basic double-pane, leaking significant energy and driving up heating and cooling costs. Modern energy-efficient windows can reduce energy bills by 10 to 25 percent annually.
Beyond savings, new windows improve comfort by eliminating drafts, reduce outside noise, and boost curb appeal. They also require far less maintenance than older wood-frame models. While upfront costs are substantial, most homeowners recoup a solid portion through energy savings and increased home resale value within several years.