a method and device for installing a tube of a geothermal closed loop system in the ground . a drill rod includes a hook for removably mounting the heat exchange tube for positioning the tube in the hole bored in the ground by the drill bit . the tube may be inserted into the bored hole once the drill is removed therefrom , mounted to the tube and then reinserted into the hole . alternatively , the tube is mounted to the drill rod as the hole is being bored .