Not having the best go of it with my new geothermal system. Two days ago when we had the first real cooling day of the season I noticed my entering water temp was 87 degrees in early evening. So today after system was dormant for a while I lowered temp setting from 73 to 71 to get the system running. It started with 60 degree ewt but in 8 minutes was up to 70 degrees and in 15 minutes was up to 74. Two 200 foot wells are drilled. Not sure if header pit done incorrect or grout not right but clearly seems like heat transfer is not good. Any ideas? Driller says it is system but I don't see how. Delta t set to 9 degrees on tranquility tev026.