Therma-Tru has redefined the industry with high style, high-performance products. That tradition of innovation and superior engineering in design continues today. Learn how we continue to set the standard in door innovation and technology and about the many advantages that come with Therma-Tru entry and patio door systems.
The popularity of vinyl is due largely to energy efficiency. Vinyl is an effective thermal insulator and is well recognized as an excellent frame material for energy efficient windows. The National Fenestration Rating Council (NFRC) and the Department of Energy (DOE), have developed rating systems for measuring how energy efficient a window is.