I have my probe in a dummy egg container, setup like an egg box minus the eggs (as egg temps will rise up toward the end of incubation which would affect the probe), the dummy box is in the middle of the incubator. I have used the same setup from small cooler, to 120 quarts cooler to fridge.
Differential is 2 degrees between top tubs to bottom tubs in the fridge cooler.
I have not used a fan in over 2 years and I have not seen any heat spike. Never did in coolers and stopped doing so with my fridge incubator too.
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