Re: "THE VAULT" - Temp Cntrl - Heat & Cool???
That would definitely work. Hell, you could use a standard low wattage bulb if the insulation was good enough, just make sure it's down in the bottom of the structure someplace so you get the right convection properties.
A home made microcontroller based temperature monitor and switch would be an easy thing to build and program for, say, up to a few thermometer units placed throughout the unit. I'm not sure how to build the bridge between a low power DC digital circuit and something that's running on AC power. I'm not sure why it would be much more than a sufficiently high capacity relay though.
Hmmm...
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