DIY Solar Garage Heater

Using Free energy sounds good to me. This DIY solar heater by Hemmings Auto Blog, takes simple common household items and combines them to make something useful. I have the same problem in my workshop. In the winter it is just to cold without some sort of heater. The concept is simple create a box of wood with a Plexiglas top, add some metal to collect the heat, attach a inlet and outlet and align it to the sun. The results were a 15 degree differential between the inlet and the outlet.