Ground source heat pump technology has been in existence for over 20 years. It harnesses the stable temperatures of the earth to provide a renewable source of heat and cooling throughout the year at substantially lower life cycle costs than conventional building heating and cooling systems. This technology offers reliable means of reducing operating and maintenance costs as well as reducing greenhouse gas emissions that contribute to global warming. The decision to ultimately install a ground source heat pump will depend on site conditions, local energy costs, energy loads, and the type of application, the availability of qualified professionals, and the commitment of the user. No system is perfect, however with proper research, users should be able to make an informed decision on whether a GSHP system will meet their application needs.