Incubator questions

I have a full sized fridge I'd like to use as an incubator. I've read that most if not all remove the cooling portion of the fridge. Is that mandatory? Has anybody used the cooling in case the temperature spikes like the little exoterra incubator claims to?

Anybody?

It is recommended to remove the cooling portion in case of future leak but also to make your incubator. Keep in mind that in this case the first step is to drain the freon which need to be done by a license professional.