> Another case of where the demand would have to increase before a 
 > product becomes available.  (DC air conditioner tied to photovoltaic 
 > cells).  Inertia to what we already have is a hard thing to 
 > overcome.  
Cathy,
 You have hit the nail on the head. I'd imagine that the demand for a 
DC/PV-powered air conditioner is very low, thus causing extremely high prices 
if someone was to try to build such units. The first one always costs a 
million dollars, but they get a lot cheaper after a few thousand are out the 
door. :-)
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