Hello all, we are looking at replacing our existing electric central air and LP furnace with a geo thermal heat pump. We currently utilize a well(20gpm) for our water needs. We've gotten quotes from a couple of different installers and although we were initially thinking about closed loop systems we've been pushed in the open loop direction due to the fact it is much cheaper, more efficient and(so we've been told) water is one of the great resources and luxuries available to us in this state so we may as well use it since there is no worry about the aquifer drying up. We have a 2400 sqft home that is 20yrs old and the 2 quotes feature different size systems. Both Bard, one a 3ton GV38S3AAN and the other a 5ton GV61 with 14kw aux heater. Personally I feel that a 3ton may be a bit small(the guy did absolutely no measurements) and a 5ton perhaps a bit large(this guy did measure the place and said we could go 4ton if I wanted and save a few hundred bucks but said energy savings on AC never leaving the first stage and having plenty of heating made the 5ton the better option). Both systems would discharge the water out back behind the house and include everything needed to perform that as well as all the electrical required and a new thermostat. The 3ton system was quoted at $17k and the 5ton system comes in at $18.2k My questions for all of you fine folks: Do these quoted prices seem reasonable/on the mark for these types of systems? Online research is all over the dang place on pricing these out and most seems to be for closed loop systems so it's hard to tell. Size-wise these systems seem pretty different so at least one must be missing the mark.. does splitting the difference and going with a 4ton make sense here or should I really just go with the 5ton and save some money on cooling in the summer? Any gotchas or things to be aware or leary of from people who have went the open loop route? Maintenance, water quality, water draining etc?. We usually keep our house 65 in the winter and 74 in the summer. With this system we would probably go closer to the middle and aim for 68-70 if that matters/helps at all. Thanks in advance for your help, let me know if there is any additional information that I can provide that would help!