The Department of the Interior’s (DOI) historic headquarters has remained operational during an extensive six-phase renovation process. In addition to MEP engineering design for building systems, GHT completed an extensive energy study encompassing analysis, modeling, and conservation.

The study provided a detailed analysis of several alternative HVAC systems, ultimately leading to the selection and implementation of a dedicated outside air system (DOAS), one of the first such systems in the GSA portfolio and now a GSA standard. The studies also included an ADA accessibility study; CO2 analysis; and recommended upgrades to accommodate increased office automation.