I was watching a woodturner's show on PBS tonight and they were doing bowl blanks. For drying the blanks, the host took them to a feller that was using an old gutted refrigerator as a kiln. He had several plywood shelves with lots of circulation holes in them. At the bottom was a 60 watt light bulb and a small circulation fan. There were also adjustable vent holes, on at the bottom and one at the top. The light bulb was connected to a thermostat and he kept it at about 80* consistently.
Looked like a good solution for someone that wants to speed up the dry time and has the space.