Simply put, U-factor measures how well a window keeps heat inside your home. It’s a measure of total heat flow through a window or door from room air to outside air. Lower numbers indicate greater insulating capabilities. It’s a particularly important measure for climates with colder winters.

If U-factor denotes how much heat leaves your home, the Solar Heat Gain Coefficient (SHGC) measures how much radiant heat enters your home. All you really need to remember is: The lower the number, the less heat a window lets in.

The amount of visible light transferred through a window. Low E coatings can reject solar heat gain without significant reduction to visible light passing through the glass.

Signature Collection
Featuring the Ultimate, Modern, and Coastline product lines, this collection offers our broadest range of product types, sizes, configurations, and design options.

Elevate Collection®
An ideal blend of remarkable design and superior strength, Elevate products strike a perfect balance between enduring style and unmatched performance.

Essential Collection
Essential products resist fading, chalking, peeling, cracking, and are eight times stronger than vinyl. Simpler features and options streamline the ordering process.