My first reflectorless solar cooker was built out of sheer frustration. I wanted to solar cook, but didn’t have the time to find the cardboard that was both big enough and sturdy enough to make the lid with a reflector (that is supposed to be so necessary).
Since I already had this screen door window, I just put it over the box. I placed a thermometer in the cooker and prayed. I needed it to reach at least 200°F and maintain that temperature for at least two hours to meet most of my cooking needs.
It reached nearly 300°F and stayed there for well over two hours! I was happy and mad all at once. I was happy this worked and mad that I didn’t test this sooner. My conclusion is that the people who wrote about the box cooker are not from Hemet. I can solar cook without reflectors due to the crystal clear sunny days we have.
Reflectorless cookers are not new. They were known nine years before USA became a country! In 1767, Horace de Saussure set out to determine how effectively glass traps sunshine. Imagine if his research had been expanded upon back then. I think a lot less deforestation could have been a likely result. You can read about Horace de Saussure here.