Depending on the size of fridge you find, you can get a piece of 11 inch heat tape that is the length of both sides, the top and the bottom. drill a hole in your fridge whereever you want the power cord to come out, you can secure the heat tape to the inside of the fridge with metal duct flashing or tape of some sort. By this time hopefully you've decided on which thermostat to use, Helix or Big Apple would be my only choices, personally.

You should mount at least one computer fan inside the incubator, the number of fans my vary depending on the size of the incubator. You can get these at most computer shops and i'm sure you can find them on ebay, one can be safely hard wired to a 16volt AC adapter that you can pick up at radio shack. What you are trying to achieve is that all you shelves for eggs are the same temperature, varying 10ths of a degree aren't a big deal, but varying several degrees can be the difference between life and death of an egg.

Hope this helps...

A few small ventilation wouldn't be a bad idea but, they will get a ton of fresh air every time you open the door.

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