Quote Originally Posted by uni88 View Post
The house in POD's link is in Portland on the Columbia River. If the Columbia freezes we're probably having bigger problems of the "Day After" variety.
Ah, true. I was thinking more of something in the North Dakota area. Much milder winters out in the PNW.


Quote Originally Posted by cx500d View Post
Also much of the efficiency is he ability to transfer heat/cold from the fluid loop to the heat sink. Water immersion is a way better coupling medium than ground.
Interesting. I never realized that was a thing. I have a closed-loop ground geothermal HVAC system in my house, but didn't know much about other types.