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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
Build your own solar panel. 9Image of aligning the Solar Cells on the window)
Use Salvaged Storm Windows to Make Solar Collectors. Low-cost, weather-resistant, simple to assemble...
Surviving Winter Storms...No Power, No Heat, No Problem!
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)