Solar window collectors take the shape of a window in a home or business while retaining the normal function of a window. Currently, solar collectors for windows require new installations of efficient glass and frames but developments are being made in producing spray-on films that will convert ordinary window glass into solar collectors. Passive solar systems collect hot air from the windows and transfer it into rooms through a duct-like system to heat a room. Active solar window collectors have photovoltaic cells located at the edges of the window that relay direct current energy to a battery for use or storage.
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