> What I had in mind was to put the heat energy to use in the summer to
 > power some kind of heat pump engine that would run an air conditioning
 > unit. So that the sunnier it gets the better the air conditioning 
 > works.
I've often thought about an absorption cooling system, fueled by wood. Owning 
a sawmill, I have plenty of that!
The problem with solar heat is that it's 'low grade', IE, not very hot. Most 
engines or absorption systems need a high temperature to operate.
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