Hello, I recently purchased a 2400 sq ft ranch home with 1300 sq ft conditioned basement in NE Indiana. It has a WF Premier 4.5Ton package unit in the basement that was installed in 2001. I have an open loop system and 4" submersible well along with what appears to be a 40-50 gallon pressure tank. I am unsure of the HP rating of the pump and the actual well depth, but most wells in this area are anywhere from 65-120 ft deep. Only the Geo unit and outdoor spigots use the well water. All home water used comes from the city supply. Overall, this system seems to heat the house just fine. I have only owned it for 45 days and we are in a full remodel of the home, so I have not been in the home to check operation and comfort daily. I have asked the original installer (also the same company that has serviced the unit for the last 17 years) to come out and educate me on how the system is configured (pressure tank cut-in/out settings, GPM setting of flow through unit, Taco valve operation, etc) I told them I just needed an education and also an opinion if it should be replaced soon and what they recommended. They did not seem to care to talk to me on the phone and never called back, so I thought I would start here with my basic questions and find a good company to service/replace this unit in the future. 1. Currently, the well cut in pressure is roughly 45 and cut out is almost 75. The 1st stage Taco valve is very noisy above 55 PSI and the 2nd stage is noisy above 45 PSI. It seems to me that this pressure is excessive and if I am understanding correctly you only need 12 PSI or so for the unit to operate correctly. Should I simply adjust the cut in/out pressures down to eliminate this noise or is a pressure reducing valve recommended? I obviously need decent pressure for outside watering as well, so looking for a solution here. I want to get rid of the turbulence noise going through the Taco valves. 2. How do you measure GPM flow of water through the unit? On my system water comes from the pressure tank, to an iron filter, through the unit, through a ball valve leading to Taco valves, another ball valve after Taco valves, and then discharges through PVC exiting the home with no ability to collect the discharge water for measuring. There is no flow gauge or ability to measure water exiting the Taco valves. The ball valve after the Taco valves is closed about 1/2 and I assume this is to regulate either flow and/or pressure, but I have no idea how much water I am flowing. Fro what I understand I need about 7 GPM or so of water flow for the open loop system assuming 50F EWT and 4.5 Tons. If I am flowing too much water I assume this will make more noise in the valves and waste energy? Too little water will cause the system to freeze up/lockout? Does varying pressure also vary the flow? 3. All in electric costs are about 11 cents per KWh here, but natural gas is fairly inexpensive also. Assuming the well water quality is good does it make sense to continue with Geo? I also am considering adding solar panels on my roof in the future which adds to the advantage of Geo. My roof pitch, area, and direction is ideal for solar. I am just trying to decide if Geo is still the way to go and if the open loop system is reliable. I like efficiency, but will pay more for reliability and simplicity. I have always had GFA with standard A/C split system in prior homes. 4. Finally, assuming I stay with Geo, what is the current preference of brand. I have read about the series 5 and 7 WF and the CM Tranquility 30. The CM appears to have a little better technology interface for the user and also has an internal automated water flow valve for open loop systems like mine. The WF is manufactured 25 miles South of me and seems to be popular around here. Thank you!