Speaking for my Niece since I know a lot about geo. Her system has a problem. It kicked off on EWT over temp when there was a lot of summer left. During the winter her EWT is pretty low. I have not been able to check it out real close, she is several hundred miles away. She is not rich so is conservative with the thermostat. The house is well insulated and the system was installed when house was built two yrs ago. There is no buffer tank on the de-superheater. I am getting ready to contact the contractor and thought I might ask some of your opinions as to what to say or ask of him in a letter or phone. I was thinking to ask for all the specs of the loop (horizontal slinky) and the pump. Also I think a good flow cart would give you GPM along with head pressure. I want to know those numbers. I sure hope it is air and not a rock on a tube or undersized loop. I put a thermometer on her entering water when it was new. I only remember it being low (winter). The contractor told my niece to give it a yr. or two to for the soil to settle. Now he is saying water the loop field and have the nieghbors come over for free hot water. I do not like hearing those kinds of statements at all. I have studied this forum about three yrs ago for 6 months and have learned a ton from what I consider top notch professionals who really do give a darn. I hope her contractor can fix this and not contribute to giving such a good industry a bad name! Any feedback or answers will be greatly appreciated! Thanks!