Hey Guys, I'm in the process of getting a geothermal HP installed. The quote I accepted was for a 4ton unit with a 4ton loop installed per IGSPHA standards by an accredited well driller. He started the first well today and I inquired how deep the wells would be. He told me he was drilling 2, 280ft wells 18ft apart. I expressed concern to my installer that this vertical loop may not be sufficient for a 4 ton load. My installer is telling me that since he's doing a double loop in each well that he expects to get 20-25% more conductivity per well. Does this sound accurate? I thought I trusted him and his experience but everything I can find points to the need for deeper wells per ton and maybe a 15% gain from running a double loop. Also, the well driller has quoted me a different price per foot than what the installer is now saying. At this point I'm concerned that the loop isn't being properly sized to support the load on my 4ton unit. Not sure what kind of data is needed to verify the loop but avg ground temps for my area is 62 degrees and thermal conductivity runs between 2.8-3.1 K w/meters degrees C.