I looked into it last spring when we got our air to air pump. When I asked for a quote the salesman laughed. He then let me know that he has only priced one out for residential once and since it was about 8 times the price of the air to air, he has yet to see one. Considering my air to air cost about $12k with a fairly extensive electrical update I figure it'd have been at least $50k probably more.
But I can report my air to air with AC is has lowered my electric bill by about $75 a month (no more window units--no more space heaters in some areas). Also considering that I don't have to buy oil anymore I'm guessing replacing my heating and cooling system is saving me about $1000-1500 a year.
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"live your life as an experiment"-- B. Fuller
If we can't be free, at least we can be cheap"--F. Zappa
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