The Hall of Records is the smallest of four buildings on the courthouse site and consists of approximately 10,300 square feet. In October 2003, an interior rehabilitation of the Hall of Records was started, which included the restoration of the 50-foot diameter skylight, fabrication of period furniture, and the installation of a water-source heat pump system to heat and - for the first time ever - cool the building.
The Hall of Records retrofit is expected to run about $2.4 million, with the geothermal system alone costing approximately $250,000. The National Historic Landmark status of the courthouse complex means that great care has to be taken to ensure nothing will impact the historic buildings. The discreet nature of the geothermal system was a perfect fit, as it will keep occupants comfortable, while maintaining the structure's original historic site context, character, and charm.