I just took over maintenance on a school and they have slinky loops installed under two buildings about 12 inches below slab, the slabs are 18 feet below grade. I have trouble with both systems. One system has a heat pump and the other just a heat exchanger. My question is could the slinky be installed this way? And if not where can I find documentation on this so I can prove my scenario doesn't work so I can start working on a new solution. Every thing in have seen and read points at a open field loop install but nothing I have looked at says it can't be under a building, or if okay to be under how deep it should be. Thanks for any advice.