When we bought this house, it had a single well, pump, and pressure tank serving both the geothermal HVAC and the domestic water. The county laid water mains just before we moved in 3 years ago and we finally hooked up to city water this week. When doing research on the geothermal system, I learned that pumping the water up to 70psi, storing it in the tank, and then running it through the GSHP is really killing most of the supposed efficiency benefits of the GSHP. Now that the domestic water no longer needs to be supplied from the well, I'd like to optimize the well setup for the GSHP in order to improve the efficiency and stop spending so much money on the electric to pump the water. Ideally, I'd love to have the GSHP turn the well pump on/off as necessary and eliminate the pressure tank, if this is even possible. To make this more complicated, the well and house were built before there was any sort of code enforcement in the county. There's no record of this well's construction at the county office or in the small amount of paperwork on the house that we were given. I have no idea how deep it's drilled, what the water level is, how deep the pump is set, or even what kind of pump is in there. So, in order to re-design the system to make it as efficient as possible for the GSHP, what questions do I need to find answers to? I'm sure the unknowns about the well are important but what else do I need to find out in order to have enough information to pick the best solution? Thanks!