hi guys, im new to this forum. and trying to understand why the geo thermal loops have to be buried underground or submerged in water. if the physics behind geothermal heating is that the fluid with in the loops absorbs the surrounding temperature and brings it back to the heat pump for the heat (or cold) to be extracted, then why do the loops have to be buried at all? why couldn't we leave the loops in our heated basement and renew the heat from already heated fluid in the loops? does burying or submerging the loops affect transfer of energy in any way?