During the winter I have been working on a cold frame type structure that I could use to hold plants through the winter and harden off seedlings. I also want to use it to hurry up growth of my entrance planters at my gardening job. So after searching the Internet for a while I found a passive solar unit that uses recycled two liter bottles. I have a stack of shower doors that I was able to bring home from a remodel. I have also gotten two hot water heaters that were being replaced. A plan began to take shape.
The first thermometer shows the temperature on a piece of black plastic outside the box and the center picture is inside the box. There is a difference of about thirty degrees F after just about five minutes.
The last picture shows the poor thermometer after I closed the box up and took a thirty minute lunch break! The thing blew up! I guess the solar collection part works anyway.
Big thanks to Barbara, Terry, Shannon, and everyone else who provided two liter bottles!