I went to Home Depot last night to pick up the electrical parts that I needed to finish my proofing box. After my conversation with the employee in the electrical department who was a licensed electrician, I kind a changed my mind when he pointed out the many things that could go wrong with what i was trying to do. So I put everything back & went home empty handed.
I did a bit of research online & found another simple, SAFE, & effective home made proofing box & in no time put this together. All you need are 2 plastic storage containers (The bins should fit inside each other with a gap of air at least two inches between the two bottoms), an aquarium heater with a built in thermostat, & a thermometer. I have been testing it out for 4 hours & the temperature is extremely stable & very accurate.