I have a new house under construction and would like some clarification on quotes from a couple contractors. I already purchased the air handlers, Miami heat pump 3.5 ton 2 stage and a 2.5 ton, on the advice of one of the drillers. The company that did my manual j and d told me that vertical was the most efficient way. From what I am reading this is not the case. In fact his quote was about $20k more that getting conventional units from my younger brother. Another installer wants to dig a deep trench and coil the ¾” hdpe in it, backfill a few feet and coil back towards the house. The trench would be 90’ long and 10’ deep with about 2000’ of pipe in each one. They said I need 3. Does this sound right? Another wants to just lay the pipe at about 6’ in straight runs. He has a trenching machine so it would go fast but it would mean a lot more trenches. I am in southern Louisiana and the ground has a lot of clay at 5' and deeper and i start getting water at that level also. I also have read that using 800’ per ton is a safe number but what about the sq. ft. I have seen nothing on how many sq. ft should the loop field be in per ton. I understand there is no set formula and every job is different. i have seen where you can make a large bore hole, say 18" x 20’ deep, and place a coil tower in it with over 100' of pipe on it. i am no pro, but seems to me that the center of this coil would get hot or cold and the system would lose efficiency. more piping would have to go in to compensate. any thoughts on these towers? i have not seen a lot of information on them so i guess they are not widely used. I have also read about hdd, which I would rather do, but there is no one around here that has done this for geothermal purposes. I would be concerned that the grouting in would not be done properly. if the ¾” hdpe was stepped up to 1" or even 1.25” hdpe could the loops be shorter and hooked in series or will the friction loss be to great for the 1/6 hp circulater. can pex with the expander rings be a reliable substitute for the loop field. on another note, the desuperheater. with the tap water being pumped through the unit, would this cause scale to build up? i do plan on putting in a jacuzzi later on. for this application, would it be better to reroute my loop field in the summer to a heat exchange for the tub, or reroute the desuperheater with a thermostat so when the buffer tank hits its temp it auto switches to the tub? the reason for this would be that it is tap water and not a toxic mix. i apologize for questions being all over the place, i am kinda new at this. any and all help is greatly appreciated.