True coolers make great incubators.
Ours will hold 18 7qt tubs with water on the bottom shelf and top shelf.
It takes two 30" strips of 11x12 flexwatt to heat it.
We use a bathroom ceiling fan plugged into a rheostat to control the airflow and help control the temperature shelf to shelf.
14 or so 1 gallon water bottles.
The cooler was $200 on craigslist, there is less than $425 into it helix thermostat and all.
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