I need some advice on two different well driller quotes I've received. Quote 1: 2 boreholes, 320' deep each 2 330 ft 1.25" loops Thermo grout, conductivity of 1.2. 1 set of 1.25" header lines from borehole to inside basement Quote 2: 2 boreholes, 300' deep each 1" geothermal piping (length not specified) Bentonite grout, no conductivity specified 1 set of 1.25" header lines from borehole to inside basement The prices are amazingly within $100 of each other. My main concern is around the depth of the boreholes (320 vs 300 ft), and the diameter of the piping (1.25" vs. 1"). Another concern is the grout. Quoter 1 told me bentonite is no good, and that you must use thermo grout. This is for a 4 ton system, BTW. Thanks for any input you guys have.