Another post suggested this: https://www.amazon.com/Caframo-Limited-Cabinet-Heater-Settings/dp/B018KO5XV8
I was planning on finding an old fridge since I felt it would be well insulated. Do you have any particular heat resistant insulation you would recommend? I really want to make sure this is safe.
Look up enclosure heater. They have safety cutouts and are adjustable like this:
https://www.amazon.com/Caframo-Limited-Cabinet-Heater-Settings/dp/B018KO5XV8