This type of geothermal loop configuration is ideal for homes where yard space is insufficient to permit horizontal buildings with large heating and cooling loads, when the earth is rocky close to the surface, or for retrofit applications where minimum disruption of the landscaping is desired. Contractors bore vertical holes in the ground 150 to 450 feet deep. Each hole contains a single loop of pipe with a U-bend at the bottom. After the pipe is inserted, the hole is backfilled or grouted. Each vertical pipe is then connected to a horizontal pipe, which is also concealed underground. The horizontal pipe then carries fluid in a closed system to and from the geoexchange system. Vertical loops are generally more expensive to install, but require less piping than horizontal loops because the earth deeper down is alternatingly cooler in summer and warmer in winter.

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