The most common configurations use basic plumbing equipment and traditional air-conditioning ducts that are buried in soil and water below the frost line, four to six feet below the surface. Drilling to put in ground loops is the most expensive part. The loops are filled with water or water mixed with nontoxic antifreeze. The finished system has no noisy compressors or boilers and no pollution. As an added bonus, it also promises to lower energy costs.
Some utilities even provide grants or rebates to encourage homeowners to go geothermal.
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