How deep does non-permafrost typically go ?

[MN Renovator]

Originally Posted by theoldwizard1

If I ever had a GSHP system installed, there would be a "performance" clause in the contract. If my inlet water temp EVER fell below 40F, the installer would have to repair/replace/agument the ground loop. I would try to hold 50% of his installation fee in escrow for at least 1 year.

If you are going to pay the premium of having a GSHP, you want one that is designed and installed for optimal performance !

Do you think there would ever be a contractor willing to provide such a performance clause? ..or allow themselves not to be paid in full for that long? Most contractors can't afford to provide such a guarantee unless their business was more of a sure thing or health related like radon mitigation.