Your turnkey source for geothermal HVAC systems across America... . From feasibility analysis and engineering, to construction and maintenance of your geothermal HVAC project, one name does it all. We are TRISON Construction, and we are your Geothermal HVAC expert. Geothermal is our total focus; it is what we do. And we have a proven track record of successful, on-time and on-budget projects to show for it. TRISON, your single source for... No cost initial feasibility study No rule of thumb costing In-house project specific engineering Thermal conductivity testing for design verification