Register Geothermal Installer Training and Testing - April 4-5 at College of DuPage, Glen Ellyn Description: Registration for GAOI installer training and certification testing - April 4-5 at College of DuPage in Glen Elyn. GAOI Members: Before starting the registration process please Click Here and: Log in to your member profile and make sure your membership is current. Update your member profile information such as contacts, email addresses and phone numbers. Register for training and certification testing for $500.00. Register for certification testing ONLY for $100.00. To become a member of the Geothermal Alliance of Illinois click here. Training/Certification Location: College of DuPage, 426 Fawell Dr., Glen Ellyn, IL 60137 We are sorry but registration for this event is now closed. Please contact us if you would like to know if spaces are still available.