I use heat cable in all my racks and in my incubator with great success. The only experience I have with heat tape is someone gave me a small rack with heat tape and a on/off Tstat. The heat tape jumps up real fast and gets too hot with this type of thermostat before it shuts off and in return gets too cold before coming back on. I believe this to be the fault of the tstat and not the heat tape tho. If I were to ever use heat tape in anything I would make sure it was controlled by a proportional thermostat. Which you should have for your incubator anyway.

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