My greenhouse goes below freezing 45 minutes after it does outside, but in the midmorning, when it's in the mid 30's Fahrenheit, it gets up over 100F. It was 106 degrees inside with all four roof vents open while it was 39F outside. When it's 72, is it going to be 150F inside? When it's 95, will it be 180 inside? I don't get it. I should have just saved the money and built some nice cold frames.
