Windows that change their tint are not new, but this window by RavenBrick does so without any energy use required. The RavenWindow changes its transparency depending on the temperature, so basically if it's hot outside less heat passes through it and if it's cold outside then it becomes more transparent, allowing in more heat from the sun. The implications are obvious – savings on your energy bill as a result of reduced use of your heater or air conditioner. With "America's Greenest Building" commissioning the first commercial installation of the product, it's bound to have a bright future.
Read the full article: RavenWindow automatically changes transparency with temperature