and I'm not convinced that altering the temperature of the underground is all that wise. It does look like the initial cost is very high and I don't think there's a guarantee that the underground plumbing will last forever.
Using the mid range of the expected cost, I'd guess you'll need at least $20,000 up front. And so the plumbing is often guaranteed for 25 to 50 years? Sounds good...but is there a guarantee that the above ground system will last that long or be replaceable/repairable for the life of what's buried?
Are you happy with it? What did you have to pay?
I am looking seriously into installing one, but few in my area know much about them. The government just changed the tax credit to 30% of its installation cost yesterday which is encouraging and helpful.
But, will one work for my 100 year plus house? Its insulated and I plan to add more. I am trying to gather numbers and information now.