[AC_Hacker]

Originally Posted by buffalobillpatrick

Geothermal heat pump - Wikipedia, the free encyclopedia

"Recent studies show that utilization of a non-homogeneous soil profile with a layer of low conductive material above the ground pipes can help mitigate the adverse effects of shallow pipe burial depth. The intermediate blanket with lower conductivity than the surrounding soil profile demonstrated the potential to increase the energy extraction rates from the ground to as high as 17% for a cold climate and about 5-6% for a relatively moderate climate.[18]"

This is from:Ground source heat pump pipe performance with Tire Derived Aggregate

So what will you do with this info?

-AC