Hall it the curse of the picture window. Big panes may light up a home, but they also let in enough heat to drive up the temperature by several degrees, raising cooling costs. Self-tinting windows solve the problem, darkening or turning opaque on command, but they are expensive and require custom installation. California start-up SONTE has developed an alternate approach: an affordable after-market tinting treatment. SONTE film works like an ultrathin LCD TV. It consists of a layer of conductive liquid-crystal polymer sandwiched between layers of PET plastic. Users trim the film to the size of the window and smooth it onto the glass.
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