Super Cheap Window Heater, Free Energy. Super cheap window heater using free energy. This window heater cost about 50 cents but can be taken down and used for a trash bag again making the cost practically free.
Sun light is 30 - 35 BTU hour per sqft in this area. With the size of the glass in this window (not the window frame) we get 157 - 184 BTU hour. Not to worry about the light coming in the window, we have other windows. The black will make more heat than any other object in this room, most items are light colors.
Don't plan on this heating your home, but it does a little extra free heat.
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