STEP 3
If you have a reflective (with the shiny mylar foil looking material) sun shade for your car that you no longer need, that’s perfect.
If not, locate a quality auto shade with a reflective surface on at least one side. Leave at least one reflective side as it is. On the other side, spray paint the shade black. This will be placed on the bottom of your cube.
Use the black side for the solar heater application. When you want to convert the cube into a solar oven instead, flip the car shade to the reflective side.
NOTE: Make sure you cut the shade to the appropriate size.