This house has the EarthLinked ®  heating and cooling system, which is the most efficient heating and cooling system in the world.  The manufacturer, ECR Technologies, Inc., has developed and perfected this geothermal system which uses the constantly renewable thermal energy from the earth in the most direct way possible.  ECR has eliminated the need for the complicated and problematic intermediate water loop, which is required by most all other geothermal systems.  The EarthLinked System replaces the costly water loop components with a small cooper earth loop for direct exchange of the energy between the earth and the R-22 coolant used throughout the system.  This system increases performance and reduces the energy needed to heat and cool a home by 30% to 60%.  Maintenance and service costs for this system are less than those required for conventional HVAC systems. EarthLink costs a little more than conventional systems to install, but the paybacks are quick and the benefits are long lasting.  This system quietly delivers high quality indoor air through superb humidity control and greater air filtration.