H Windows are built in America for architects, builders, and homeowners who demand the very best in quality, environmental, and energy efficient design.
The wood in Sierra Pacific windows & patio doors is protected to the very core by CoreGuard™. It’s the best wood treatment in the window industry, and only Sierra Pacific products have it. CoreGuard actually penetrates through the entire cross section of wood. As a result, all their all-wood and clad wood windows are nearly as rot-proof as vinyl, shrug off insects like aluminum, and are warmer than both of them. CoreGuard is patented, proven, naturally organic, and environmentally friendly.
