The underground heating and drainage system was redone in 1997, with a system of pipes filled with a solution including antifreeze replacing the electric coils. After the 2006 season, the surface, heating, and drainage system was replaced
In 2006, the Green Bay Packers decided to renovate the "actual" field. However, this decision was not due to the field heating system, but the integrity and logistics of its age old construction. The field was completely removed down to the sub-grade including the field heat tubing, drainage, irrigation, and electrical systems. The areas within the field were graded to achieve one final elevation, thus removing the many sloped entrances and pathways within the bowl. This final elevation is actually nearly 12" lower than the previous installed field, making the famous "Lambeau Leap" a larger obstacle for some players.
The field received a new heating system located 10" below the surface. There is an estimated 30 miles of tubing that controls the heating of not only the field, but the camera path, players entrance, and trench drain. The system also received new boilers, pumps, valves and an updated controls system.