[Myrddin]

Are there any ongoing maintenance issues with the 200 ft wells or circulating system? My area has low temps to -20F in the Winter, highs to 102F in Summer. Getting access to drill the wells might be an issue on my property as well. I would have to do an economic analysis before jumping on the technology.

[Eric in the Ozarks]

No issues as of yet and the system is 12 years old. The wells contain sleeves, like heavy fire hose material, so the antifreeze mixture is in a closed loop. The unit is a Water Furnace brand.

We explored several suggestions for heat/AC with economy as a primary consideration. The whole system cost about $21 K for a 2700 sq. ft two story house. Best Andersen windows, super insulation in the roof and outside walls, caulk all the switch and receptacle boxes; in other words, seal it up tight. We have an energy recovery ventilator in the furnace room that we run when there is a lot of cooking or when we have a few guests.

In 12 years, we've had one service call for a fuse replacement (I keep a spare and can do this myself now...)