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black painted cardboard for solar window heater?
Your Window = Solar Heater. Interesting thought
solar window phone charger
DIY Solar Window heater
sticky window solar chargers
Use Salvaged Storm Windows to Make Solar Collectors. Low-cost, weather-resistant, simple to assemble...
ENERGY FILM - A transparent window film that reduces solar heat gain in summer and heat loss in winter while allowing maximum visible light into the room.
Solar-powered window blinds
Off-Grid Solar-Powered Air Conditioner
Window Mounted Solar Hot Air Furnace (Aluminum Soffit Based)
Universal Solar Battery Charger to charge batteries for flashlights and other misc things.