I got an Email back from sun frost it is as fallows:
We are starting to work on this idea
again and may have a unit available this summer. We are trying to ensure
that the refrigerator compartment will not become too cold when the outside
temperature is below the temperature that is needed inside the refrigerator.
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I've often wondered if you could use water as the working fluid, or something else that would stop working when it got to cold.
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