“Ground Loop installed our Water Furnace geothermal back in 2010, and we have loved it and their service ever since — including that they are always happy to work with you to tweak thing exactly how you want them. The unit works great, except on the extremely rare occasions when something breaks (like when the original compressor died in the middle of a real cold snap a few years ago) but then they immediately help you over the phone, to try to affect a work-around, and then come out real soon to do the actual repair — and they do it right the first time. Over the years, our unit has been serviced by numerous different Ground Loop techs, most VERY good; today Austin Hamel came out for a routine maintenance, and he was WONDERFUL — so very nice and helpful! The office personnel are also very nice, knowledgeable, and helpful!
If you are thinking of buying a geothermal, I bet you will love it. But be sure to get Ground Loop to install a manual over-ride switch for the electric back-up heat, as it is very expensive to run and otherwise automatically comes on if the unit has not reached your call-for temperature within a rather short while. Without that switch (which we always keep in the off position) you can not set the nighttime temperature of the bulk of your house (non-bedroom parts) back any substantial amount in the wintertime — which we enjoy the system being set to do, as that confers significant saving in energy costs.
Thanks, Ground Loop folks!”