REPLACEMENT WINDOW & DOOR WARRANTIES The Learning Center Although a warranty my claim to be a Lifetime warranty, the window, or some of its components, may begin to pro-rate over time. A warranty may be called a Lifetime Limited warranty, but within the stipulations, or criteria, you can see that you may be responsible to pay a portion of the cost after a period of time. For example, you might have to pay 50% of the window cost to replace/warrant your windows after 10 years, and after 15 years, you may have to pay 75%, and after 15 years, you may be responsible for 90% of the cost.  Nevertheless, the warranty can still be called Lifetime (Limited). In many Lifetime Limited warranties, the performance of certain components, such as the insulated glass seal, is pro-rated. Be sure to read and understand the warranty before you buy to ensure you get the protection you want and need.     7. Are all lifetime warranties “true” lifetime warranties? < back to list of questions about window warranties 1-877-SWING CLEAN info@energyswingwindows.com 3245 Miracle Drive Murrysville, PA 15668 724-387-2991 PA Contractor ID PA001856