Greg Wells, Jackson & Sons Drilling Greg has designed and managed the installation of thousands of tons of vertical commercial geothermal heat exchangers in a multi-state area. Personal Accreditations Certifications and memberships: IGSHPA Accredited Designer, Installer, and Trainer; ASHRAE Associate Member; and AEE Certified Geoexchange Designer. Greg has 20 years of geothermal experience as a system designer and installer, along with past experience as a manufacturer’s rep. for geothermal heating and cooling equipment. Greg serves on IGSHPA’s Advisory Council, as well as Marketing and Training Committees. Jackson & Sons Drilling has been in the residential & municipal\commercial water well drilling business for over twenty five years.