This old freezer actually works, but I'm only using it for a fermenting chest. It's a 120V inline thermostat (lower right) and a 15w bulb. Easily holds the chest at up to 15 degrees above ambient temp in my basement.
BTW, there are occaisionally questions about rigging a blowoff tube w/ a bucket. That's a 9/16 OD tube (3/8 ID), jammed through the hole in the lid (it's tight), with a SS clamp just inside the lid, just to make sure it doesn't come out.