Questions and Answers for JELD-WEN 36 in. x 36 in. V-4500 Series Black FiniShield Vinyl Fixed Picture Window with Colonial Grids/Grilles

A:  The U-factor for this window is .26.

A:  Thank you for your inquiry. This v4500 vinyl fixed window comes standard with glass unit configuration including 1 lite of Low-E 366, 1 lite of clear annealed glass, and argon gas filled unit of glass. As a result, this vinyl fixed window meets energy star specifications in most if not all regions of the US. The u-value (rate of heat loss through a window or door) is .26 and the SHGC (Solar Heat Gain Coefficient – measured amount of solar radiation transmitting through a piece of glass or door material) is .22. Additional resources are available on our website specifically related to energy performance of our products: https://alfresco-docs-prod.s3.us-east-2.amazonaws.com/2584/Vinyl-V-4500-premium-thermal-performance-ratings.pdf