Hey L.B., saw it made it to almost 60°F in you neck of the woods Sunday. Did you have to open the door on your greenhouse to cool it in that extreme heat? NorthEast_ChileMan Actually at the end of March it was warmer. I have an 8" fan installed in the roof, I use an attic fan thermostat to turn the fan on. The T-stat is set for 80F at head level.. Every year since 99 it's been warm at the end of March and then cold and wet all summer long. L.B.