> A fuel powered vehicle produces heat which is obviously needed for comfort 
> and to keep the windows clear.

The auxiliary radiator in a fueled vehicle is one of the most elegant bits of 
engineering, ever.
Taking a waste product (heat) and making full use of it for comfort and safety. 
 REV's don't have
much waste heat, and so far as I know nobody's making use of it.  If they did, 
it'd have to be
like a VW beetle, with an air shroud capturing the motor heat.  REV's can 
choose to use a heat
pump rather than resistive heat, which gives them something like a 3x 
multiplier for the energy
expended.  Still, they're at their worst in cold weather no matter what.

-- Jim


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