Geothermal Heating Cooling

. I think I found an answer. 1. Solar heating available everywhere the sun’s rays fall, but geothermal is only optimum in any places 2. Equipment and expertise required for solar heating is realtively simpler in comparison with geothermal heating 3. System of pipes (and water used) is less in solar heating (because the panels are smaller and sompact) but the pipes used in geothermal have to be built specially to not only withstand pressures underground, but also be conducting enough to absorb the heat. you can find further details in geophysical explanations for geo thermal and promotions of solar heating