Step 5: Conclusison and improvements.
In addition to baffles, Im thinking ov building a more rigid sides, and perhaps line the bottom of the "bag" with matte black card board, to keep it from collapsing/flopping. and perehaps to keep it from loosing any heat out the back side.
I want to experiment with making this solar, so the fan only blows when the panel is in the sun. jsut replace the 2 9v batteries with a 12v or 3 5v solar panels.
I'm also interested in building a reversed thermostat, so it will turn off the fan if the temp in the box is below a threshold. (will outline this one as I figure it out)
I plan to test this one to bring a little winter warm into my workshop, but i may build more and bigger ones for my house and other places.