The old Barre school building was converted to the new headquarters for the Vermont Historical Society. The facility is multi-use, including administrative offices, a multi-purpose room, an auditorium, a library, classrooms, exhibit areas, collection storage areas, and an archival "secure" storage area. Environmental requirements ranged from a strict 60°F, 30%RH for secure storage; a less severe 70°F, 50%RH for collection storage, exhibit, and the library; to a normal 75°F with no specified humidity level for the administration, auditorium, multi-purpose room and classroom areas.

A four-pipe chilled water/hot water system serves 9 indoor air-handling units, 2 rooftop air-handling units, and an outdoor pad-mounted desiccant dehumidifier unit. Each zone is served by a single air-handling unit with hydronic chilled water and hot water coils, with the hot water coil in the reheat position for dehumidification control. Most of the air handling units have provision for future carbon filtration (a 30% pre-filter and 95% final filter was standard). Zones with specified humidity requirements have a steam humidifier in the main supply ductwork. All units except for the rooftop air handling units over the auditorium and over the 3^rd floor classrooms are located in the basement, and there is no hydronic or water piping above the basement other than that which serves the sacked toile rooms; this was requirement to protect the historic volume except for the units serving the administration area, library, and classrooms.

The archival secure storage area in the basement is served by a Munters Silica-gel desiccant dehumidifier pad-mounted outside the building. The desiccant is regenerated by a propane heater, and the unit includes chilled water and hot water coils, and 30%, 95% and carbon filters.