Throughout the United States, the underground temperature is relatively constant so GHPs (geothermal heat pumps) can be effectively used virtually anywhere. But, the specific hydrological, spatial and geological characteristics of your land will help your installer or supplier determine the most suitable type of ground loop.

If you don’t know what a ground loop is, see this illustration:

Before Geothermal Heat Pumps Can Be Installed, Properties Need to Be Evaluated

  • LAND LAYOUT: The layout and size of your land, the location of sprinkler systems, underground utilities, and your landscaping will be determining factors in the system design.
  • GEOLOGY: The properties and composition of your rock and soil can affect the rate of heat transfer, so they are factors that also need consideration. Soil that has poor heat transfer properties needs more piping to collect heat than soil that has good heat transfer properties. Another factor that determines the design of geothermal heat pumps is the amount of soil. In areas where the soil is too shallow to trench, or there is extensive hard rock, vertical ground loops would be more suitable than horizontal ones.
  • HYDROLOGY: The availability of surface or ground water also plays a role in deciding the best ground loops for geothermal heat pumps. Depending on quality, volume and depth, a body of surface water could be used as a repository for the pipe coils in a closed-loop system, or as a water source for an open-loop system.

NB: Ensure that your installer/supplier fully investigates your land’s hydrology before you buy an open-loop system to avoid potential problems such as groundwater contamination or aquifer depletion.


If you are interested in a heat pump in Asheville NC or would simply like more information, contact us at HAYNES Heating & Cooling. We offer quality HVAC services at fair prices. Give us a call today!