Geothermal Contractors
Due to the growing demand for geothermal heating and cooling systems, most local HVAC installers now have staff trained in their installation. There are also a couple of organizations who can help.
The Geothermal Heat Pump Consortium has a toll free number that you can call for the names of contractors in a specific area. The number is 888-333-4472, and it is called the GeoExchange Information Center.
The Home Blue contracting network also has a free online guide which can help you find a contractor, as well as a free cost estimator.
Always shop around when undertaking a project of this scope. While extremely worthwhile, installing a geothermal heating and cooling system is a big investment. It pays (literally) to ask for several quotes from different sources.