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Geothermal energy uses the earth's innate properties to do work which we would have to do ourselves. Because of this, commercial application savings can be in the magnitude of 80% over conventional fossil-fuel systems! US Department of Energy gives a good background of Geothermal systems.
From our research, we've found that on average 25% of the building's cost will need to be considered for a complete geothermal system. Since a geothermal system can do both the heating and cooling, it can be five times more efficient than other systems providing an unprecedented 20% return on investment per year.
There are many limitations on geothermal as it depends on location and environment necessity. If proven viable for where you live, geothermal power is one of the best and most dependable natural energy source available!
For more information, also refer to WERC - an environmental construction company based in Minnesota