The enclosed passive solar winter greenhouse built on the South side of the barn solarizes in summer to temperatures so hot that plastic melts and you almost cannot walk inside. One summer the thick plastic sheathing pipe for electrical conduit melted into crazy noodles on the walls and ceiling, stretching all the wires, that had to be replaced, this time in metal piping. I grow winter greens and start seedlings in it in late Winter, but do not grow anything in this greenhouse in summer, or even much past early May when unusually large and sun-bathed seedlings are brought out to harden off and be planted in the real world. I even use a shade cloth in the Winter. Nothing could “live” in there…