Here's a surprising statistic. Less than 30% of window replacements are the result of the old windows being worn, broken or otherwise in need of replacement.
Clearly, there are other good reasons to consider new windows!
One of the most popular motivations is cosmetic. Brand new windows have a huge impact on the overall look of a home, both on the inside and the outside. New windows can improve curb appeal — an important element when you sell a home. From the inside, new windows can dramatically improve the look of a room.
Another reason to replace windows is to address energy costs. Modern windows are packed with technologies that lower heating/cooling bills. From low-e/argon to special spacer bars to high-insulating construction, these technologies can provide savings you'll notice, especially if you're replacing very old windows.
A third reason is window style and characteristics. Simply put, you may not like your current windows! You may want more glass and less frame to enhance your view. Maybe your windows pull up (vertical sliders) when you'd rather have them open like a door (casements). Perhaps you'd like fancy blinds in-between the panes of glass. Replacing windows lets you get exactly the look and features you want.
Will new windows boost the resale value of your home? They might, at least a little. But there's one thing for certain: upgraded windows definitely make your home look more appealing to buyers.