While the focus is usually on the window itself and the energy efficiency and insulation value it will contribute to the building envelope, a thought should also be spared for the material from which the window frame is made. Coupling efficient window framing materials with the right glass options for your climate will give you the most effective window framing systems.
Because glass is a poor insulator, the large amounts of energy that are wasted trying to keep the interior of office buildings and schools comfortable make glass unviable for those who wish to create an effective building envelope. Designers are torn between form and function, having to compromise either their vision or sustainability goals. Now phase change windows offer a new evolution in energy efficient window systems that will enable designers to let the light shine in.
