Hi Kathy,
Nice idea with the light!
Yes there are external thermostatically controlled "cubes" that one can buy. They are sometimes used on block heaters and, if memory serves, are available in two different temperature ranges. The temperature is not adjustable on them which is why I prefer mechanical thermostats.
louiskathy wrote:
Seems to us it had the word "cube" in the name of it. Weather cube? It was very handy whatever it was called. That and indoor/outdoor thermometers which can tell you the temperature in various storage compartments without us going outside to read them.