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On a long distance cycling race we made "on the block hot dogs". Just wrap them in tin foil and leave them on a hot spot on top of the motor somewhere that they are secure and then pop the hood open 30 minutes later (YTMV).
The AAF is interesting to contrast with solar ovens that are built along the same lines as an exterior attachment. In some ways, it really requires some inefficiencies in the buildings thermal envelope to operate. I guess the big question would be does the BTUs it needs at lower temps require much less energy than the compressor.
I still like root cellars, although they are pretty well purely rural...
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