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I have a new idea for heating windows in a home. Take voltiac cell material and 8 in by 8 ins not solar just voltiac cell. To heat the room or cool it in every window in a home. It is voltiac cells that heat and cool down every room. One set of panels is for heating and the panel is cooling down a warm room.It geneerates heat from a resistor that is easy To cool down room in summer use a fan across the terminals like computer fans on the voltiac cells.