Windows that insulate like walls.

Heat Mirror® advanced insulating glass systems are found in the most energy efficient windows on the market today. They may be the smartest, too.

Specially manufactured using a state-of-the-art glazing system that secures a unique kind of film between sheets of glass, Heat Mirror offers unprecedented thermal insulation and comfort in a window, while helping to protect you, your loved ones, and your cherished belongings from harmful UV rays.

Insulating glass made with Heat Mirror technology can have an R-value from 6 to 20, which can insulate as well as typical walls. With such performance, windows made with Heat Mirror technology can substantially lower your energy bills.

Recognized by Popular Science magazine as one of the “Top 100 Inventions of the Millennium,” Heat Mirror insulating glass has been used around the world in state-of-the-art buildings—from single-family homes to high-profile projects like the Empire State Building.