The concept of a solar oven is to harness the heat of the sun and use it for cooking. For people that are serious about preparedness this might be something to look into. There are many designs out there. You can even make your own. Click Here to learn about how you can make your own DIY solar cooker on popsci.com.
Here is a video from Starry Hilder on Your tube about her experience using a solar cooker. She has even used it as a dehydrator.
Have you ever used a solar cooker? Is it worth it? What have you used it to cook or warm up?