About Us

Installing systems since 2005

G.O. Loop LLC was started in 2005 and has been growing steadily ever since. We specialize in closed loop installations and have installed over 2,000 such systems. We will install any loop system from small residential installations up to large scale commercial applications. Our projects involve vertical drilling, directional drilling, trench excavation or pond installation.  We have design software and experience for residential/light commercial loop fields as well as for large commercial projects. For large scale projects, we also have the equipment and knowledge to conduct soil conductivity tests. For a list of commercial projects completed and projects in progress, please see our Commercial page.

Certified and Dependable

Gordy Oosterhouse is the founder of G.O. Loop and has been working with geothermal systems ever since his first installation as a HVAC Contractor in 1994. Brandt Eisenga has been with the company since 2008, serves as the General Manager, and also serves as a board member for the Wisconsin Geothermal Association. We have been adding staff members and equipment. Several of our employees have IGSHPA training and certification. IGSHPA stands for International Ground Source Heat Pump Association. This is an association which promotes, educates, and regulates the geothermal industry. We are members of the Wisconsin Geothermal Association, members of the Wisconsin Builders Association, and we are also accredited with the Better Business Bureau of Wisconsin. We are located in South-Central Wisconsin and service the entire state, including parts of the surrounding area.