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Hardin Geotechnologies focuses on the advance of geoexchange energy usage. While most geothermal design build firms have a limited specialty, Hardin Geotechnologies employs the full range of geoexchange technologies including open loops, closed loops, hybrids, and standing column wells. These geothermal systems are enhanced by variable frequency drives, controls and customized chiller specifications. This makes it possible to custom-design any installation from an overall system standpoint, to best-fit individual needs.
Pond/Lake Loop System In the pond/lake loop system, pipe is coiled in a fairly large body of water, at least eight feet deep to prevent freezing. A supply line buried in a trench runs from the building to the submerged loop. For sufficient operation, the pond/lake must be close to the building or the supply line will provide the same heat transfer function as a horizontal ground loop.		Pond Loop
Vertical Loop		Vertical Ground Loop System In the vertical ground loop system, multiple bore holes are drilled and two separate pipe lengths are connected with U-bend to form a loop. The pipes are then placed in each bore hole and pressure tested. The bore holes are backfilled with a grouting material and sealed off at the surface. These vertical loops are tied together with horizontal piping laid in trenches and then connected to the heat pump.
Open Loop System In the open loop system, a well or surface body of water supplies water that circulates through the system. Once this water has circulated through the heat pump, the water is returned to the ground through either a recharge well, a drain field, or a surface discharge. This option is best utilized when there is an adequate supply of water. The discharge must also be able to handle an increased capacity during extreme weather conditions.		Open Loop
Horizontal Loop		Horizontal Ground Loop System In the horizontal ground loop system, a network of trenches are cut and a series of one to four pipes are laid horizontally in the trench. These pipes are then pressure tested and connected to the heat pump inside the building. The trenches are then backfilled and the heat pump and loop form a sealed, pressurized system through which the liquid heat exchange medium is circulated.

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