$50 upright freezer on CL. STC-1000 from eBay, a few odds and ends.. BAM! Fermentation chamber.
However, the coils went through each of the shelves, so I had to CAREFULLY bend one layer of coils back so I could build a shelf and get a few fermenters in there. Quickly found that I am fluctuating from about 17.9-18.9°C. The STC-1000 is set to 18.5 with a .3 variance. Not too bad, but not quite as controllable as I would like.
I guess this is not a frost free one as there is a bit of condensation from when it's on. So, I realize I need some form of heat source to kick on so I can maintain better temp stability. Since there is condensation, I am hesitant to do the paint can heater... or anything else really that involves electricity as Water + Electricity. = House Fire...
So to the question: What can I SAFELY use to add heat when needed? Or, just RDWHAHB and let it fluctuate a ~1°C throughout the day?