I've seen the same type og incubator, only using 11 inch wide flexwatt. This way you can run it the length of the cooler so there is no worry about heating some boxes more than others. I am trying the reverse of your incubator this year. I am using a cooler as a "brumator" for kings and corns with the flexwatt. Same concept, just lower temps (50 degrees), and kept outside in a shed.

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