you can get the basic understanding on how to build and what to get for the fix....in the forum below on pages 17,22,23,25,28,29,31,32,44is there a step by step for this one. We have an old fridge that doesn't work anymore and was wanting DH to do this to it, but he needs some instructions and what we need to buy, such as heating and thermostats and stuff.
https://www.backyardchickens.com/t/940456/building-paradise-for-the-birds
i just started the fridgebator so you can just keep up and when i post you can follow along and see...bottom will be the incubator and top will be brooder....i would recommend the stc 1000 for the top unit and also the bottom unit so two separate stc 1000s' however the bottom one you can find the one that has the humidity gauge on it...so it controls the temp and humidity...as long as there is enough air flow it should be as good as an expensive unit...i have four 120mm computer fans that all light up going into the bottom unit...
well hope to see you post...
a fridge is going to require between 250-400 watts.....to be efficient ...as the cabinet incubators i believe use 250-325...many ways of heating the unit...they have rollout strips, ceramic, lights, and so on....and everything will do the same for heat...so up to you ....but depending on what heat source you get obviously it will be wired differently as well