Thanks Cinda, this is the first season I've tried this. It's a work in progress. So far it's doing well. Last night it got down to 24 degrees and the temp inside the cold frame only went down to 51 degrees with the heater set on 65 degrees. I've been having trouble with too much heat in the daytime on sunny days, so I installed a thermostat controled vent system to draw cool air from the outside. Today was the first time I got to try it out (Its been overcast the last 5 days). It works like a charm. It's 38 degrees outside and 84 degrees inside the frame. Before the vent system was added the temp was going over 130 degrees if the plastic wasn't raised.
