Tough question! There are many things to consider when determining if residentials windows should be replaced. This can depend on an individual’s criteria. Windows can be a rare opportunity to update the look both on the exterior of the home as well as the interior of the home, so for a certain percentage of people it may be done for a certain look and feel for your personal space. Others might be interested in safety, function, or thermal efficiencies which could be a reason to replace residential windows.
Any of these reasons can influence someone to replace their residential windows. The most common reason for replacement of windows is failures in the windows’ ability to separate outdoor conditions from the interior of the home. Thermal efficiency is large here and even with Limited Lifetime Warranties, many windows will fail thermal qualities between 15 and 25 years.