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I think you've run into one of the basic problems with electric cars in cold weather. With an IC engine, you have a LOT of waste heat: even the Insight burns something like a gallon of gas per hour, the Geo maybe double that, and about 1/3 of that heat goes into the cooling system. All that waste heat makes it practical to keep the passenger compartment at a comfortable temperature, even though it's separated from the outside only by a thin skin of metal & glass.
The only solution I can think of is to use one of the kerosene/propane catalytic heaters, of course checking first for things like carbon monoxide, and whether they're safe in a small enclosure.
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