We had a serious heat wave a week or so ago. There were several days that were over 100 degrees. Doesn't sound too bad if you're in Arizona, but in the northwest that is unheard of. We have no air conditioning, and normally little need for it. But it was hot. And we had guests coming for dinner. We came up with a dinner that we could make completely outside using the grill, crockpot, and this lovely solar oven. We made brownies in it-- and they were almost cooked after a couple of hours (we needed to get them in an hour sooner!) My second attempt at using the solar oven was much more successful with making cookies. A great way to make use of all that heat! I'll have to get adventurous and try some new things in it.
Pros: Cheap materials (cardboard, aluminum foil,
and glass.) Doesn't take any electricity or fuel. No heating up the kitchen!
Cons: It has to be sunny. It takes some real planning ahead because the cooking time for most things is very long.