> That's why it's all on paper (or bytes!), and not a wrench has been
 > turned.  To see if the project is practical.  So far, there has been
 > some opinions offered by folks with some good experience in the
 > field.  But I don't believe anyone has actually tried this.
Craig,
 You can BUY these co-gen setups off-the-shelf. They tend to be a bit pricy, 
but reportedly work quite well.
Look up back issues of Popular Science and Popular Mechanics; that's mostly 
where I've seen the articles.
I also have a magazine lying around here that describes a York heat pump unit 
that's powered by a natural-gas-fueled engine. It'll do the A/C for about 
half of the cost of electricity in many areas, and runs nearly 130% efficient 
during the heating cycle.
                                      >
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