I am installing a Geo system. I have already worked through the processes of sizing my unit, but I want other opnions on my vertical loop requirements. Geo will be a 2 stage, 2 ton unit, with deheater, and AUX heat. Building load 1700 cooling, 2500 heating. Using Geodesigner 3.3 I enter my numbers, and it tells me 250' loop with 1.25" pipe is my requirements. everyone local (that I have talked to) designs for 150' vertical loop per ton for residential. I already have 1 265' deep drinking water well I will be converting over to Geo (we now have city water). Using this is using current well, then adding 1 new well deep enough to cover below loops (loops will be same length in each well) all with 1.25" pipe. 2 parallel loops (1 in each well), manifold outside, (plus 75' each way to the house which will be average 6' under ground which is not in formula below) Which size would you go with? 2X 150' loops = 300' Geothermal source max cool 81 deg avg cool 63 deg Avg heat 44 min heat 33 Min freeze protect 13 deg. Heat 3.54 COP cooling 19.4 EER Aux balance point 9 deg (my design low is 11 deg for my area). cost per year $712.00 2X 200' loops = 400' Geothermal source max cool 72 avg cool 59 avg heat 47 min heat 37 min freeze protect 17 Heat 3.66 COP cooling 20.6 EER cost pear year $698 aux balance point 5 deg. (adds 30% to well cost over 2x 150 loops) 2X 250' loops geothermal source max cool 67 avg cool 57 avg heat 49 min heat 40 min freeze protect 20 deg Heat 3.74 COP cooling 21.4 EER cost per year $691.00 (adds 60% to well cost over 2X 150 loops) I don't think I should quote actual prices but 30% cost is more then 1 years operation cost. Thanks again for your opinion.