I installed a well system last yr for a client of mine at his waterfront home almost 7000 sq ft. It was a retrofit from his original oil burning system ( which we left in place for the hot water and as a back up system) Also in order to get the rebate from the CO OP you are required at that time to have a back up system. I will not go into numbers on the forum as to cost or actual savings with the system, but the pay back worked out to be about 7-8 yrs if I remember right. We also heat the indoor pool off the same system and the hot tub. The system works awesome weather it is heating in the winter or cooling in the summer. We used all quality components a have not had a problem with any of them as of now.
We also did a loop system at another house where we dug big pits and buried about 400 ft of 1 inch coils in the ground and do the heat transfer useing that method. You need to have a good amount of land to be able to do that type of system and on the water front there usually isnt enough.
If you would like to message me I would be happy to give you some info andpossiably answer some questions for you.
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