I have a Bard 4 ton single stage groung source heat pump with 4 200 ft verticle bore holes. In the winter, my incoming water temp is in the low 60's and outgoing is in the low 30's. Unit is flowing 11 gpm. Had my hvac contractor switch thermometers on the incoming and outgoing water lines and nothing changed. He said that I must have a warm spot underneath my front yard where the bore holes are. It has been like this since January of 2009 when the system was started up. The summer temps are coming in at low 50's and going out at low 60's. In the winter, the air temp leaving the unit is 88 degrees. The air coming into the unit from the cold air return is at 70 degrees. Unit seems to be running fine and using only minimal auxilliary heat when temps get to 20 below zero. My question is are these winter loop temps normal? If more information is needed, I will do my best to get it.