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Question DetailsAsked on 4/7/2014

How much should geo-thermal heating cost on an average installation?

Vertical looping cheaper?

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2 Answers


10 to 15 thousand more than air cooled heat pump or gas furnace, minimum, could be more as the "loop" price varies with job condions.

Vertical loops take up less space, cost depends on the depth required, could be less or more than horizontial.


Answered 5 years ago by BayAreaAC


There are SO many variables, there can be no such thing as a "typical" price. The US Department of Energy, which is really pushing these systems, says $2500 per ton of capacity, or $7500-10,000 installed for a normal home - and I say that is total BS. You would be lucky to get the above-ground portion for that in most cases.

Contractor sites say typically $25,000 minimum, and $40-50,000 range typical for a normal sized house. A good deal depends on it doing this during new home construction when installing horizontal loops can be cheaper than after the fact, and whether you are going with horizontal or vertical loops. And if vertical, where your water table lies, because installing them in water is far more energy efficient then in soil because it tends to keep a more constant ambient temperature than soil or rock. Obviously, for a well system, the materials you have to drill makes a substantial difference too - a soft sandstone or clay or shale can be less than 1/3 the cost to put a well in than a very hard rock like granite or a very porous, cavernous rock like ancient reef limestone.

You can find more commentary on geo-thermal systems in the Home > HVAC link in BRowse Projects, at lower left this page. Portland Gas & Electric (Oregon) and Pacific Gas & Electric (northern California) and EPRI (Electric Power Research Insititute) have put a fair amount of money into researching these systems and have info on their websites too, as do some other utilities and utility groups.

Answered 5 years ago by LCD

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