I'm having the same problem right now. I have my two corns in shoebox size sterilite containers on 3 inch flex watt heat tape but can't quite get above 80 degrees on the warm side. I've added a small space heater to the room on low that has helped bump up my temps to the upper 80s but not really getting the cool spot below that as well. It's frustrating and I can't imagine what my electric bill is going to be
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