I think you need to find someone that knows how to take the freon out ( )

After that, you will need to wire maybe one foot of 11" flexwatt heat tap in the back. You could drill a hole in the back and slip the flexwatt wire and thermostat probe in that hole. There also needs to be a fan to get some circulation going...not sure how often the fan needs to come on.

This is an extremely quick explaination...I am also doing my homework in fridge to incubator conversion. I hope someone with a better understanding will chime in here and give more of a detailed explaination, or post links to DIY incubators.