I am currently getting bids. I dont know squatt. I spoke w/ electric company. they will give 750$ per ton on ground source heat pump. I was planning on having the loop installed in my pond, 150 feet form basement wall. pond is 11 1/2 feet deep. I need a 3 ton unit. Electric company said it would take @ 10 years for unit to pay for itself. but i dont know. should I just have a regular heat pump installed or go with the pond source heat pump? current bid for pond heat pump is @$. I am willing to do what I can to help reduce the cost , like dispose of the old equipment, dig the trench for the pipes etc... Thanks for your thoughts. live in Troy, Missouri.