Heated garage/shop cabinets
How about this idea... an old refridgerator??f
^^^THIS^^^ Here's what you do
Get your fridge, obviously
Mount TWO lamp sockets in there, SAFELY, maybe with a wire guard so you don't break em
Now, go out and either buy or find an old "line voltage" thermostat. What I'm talking about here, is a line voltage WALL thermostat designed for baseboards or in-wall radiant heat.
Wire the two sockets IN SERIES (which is NOT normal---normall is "parallel") In other words, wire in this path------
Hot side of line plug (black)----to thermostat, out of thermostat to center pin (brass) of one socket, out of first socket shell (silver screw) to center pin (brass) of second socket, out of second socket shell (silver) to white lead of line cord
So what you have is the power going in series with the thermostat and the two sockets each in series.
NOW you get two heavy duty (130v) lamps, say, around 150 -- 200 watts.
IN SERIES, these will put out 1/4 of that wattage, IE 50 watts instead of 200
Also consider adding a "high limit" snap type "reset" switch for safety, in case the main 'stat sticks, like this one:
http://www.designworldonline.com/uploads/ImageGallery/selco-thermostat2.jpg
THE REASON is that they will not operate at a very high temperature, and because they are operating on lowered voltage (60V instead of 120) they will last a long time, and the chance of them leaving you with OUT heat in your "fridge" is slight.
Then all you need is a thermometer, watch 'er for a few days/ a week to get the temp set where you want, and you can ferget 'er.
I see no reason why you need to keep it much above 40-50 degrees
Most chemicals keep BETTER at lower temperatures.
