Geothermal Design Associates is one of the largest geothermal contractors in Indiana. Designing and installing geothermal systems is not just a side-line, it's our total business. At Geothermal Design, we utilize our extensive training and experience to design and install systems which provide our customers with unmatched economy, reliability and comfort for years to come. Geothermal Design Associates offers over 138 years of combined experience in the geothermal industry, factory trained installation and service technicians Association of Energy Engineers Certified Geothermal Designer Manual D duct design certified Authorized Geothermal Services Contractor (GSC) IGSHPA Accredited Installer and Designer Full service residential geothermal system design, installation, and service.