:applause Seriously, it's a great idea and a shame it hasn't been adopted more widely. I would take issue with their terminology though. To me, geothermal en

:applause Seriously, it's a great idea and a shame it hasn't been adopted more widely. I would take issue with their terminology though. To me, geothermal energy is extracting energy from hotspots in the earths's crust, as in Iceland, hot springs, and so on. This is just using the stable temperatures below the surface as a source/sink for a heat-pump - no energy is being extracted. Hence ground-source heat-pump.