Constructed in the 1950’s, 100 Church Street is a 1,000,000 square-feet property originally built for a single tenant. At the time of construction, energy efficiency was not the norm, and systems had no individual means for temperature controls. It was designed with central fans located in large mechanical rooms, delivering tempered air to all floors via a common duct. Perimeter zones were kept at comfortable conditions through induction units.

The systems serving the interior spaces is therefore not suited for today’s multi-tenant office needs, which result in a lack of temperature control and poor indoor air quality. It was also impossible to allow one tenant extended hours of operation without operating the entire system.

The retrofit called for the design and installation of an enhanced temperature control system that would increase the capacity of the central fans. The chilled water supply temperature was decreased to compensate for the additional cooling capacity required to meet the needs of the building. All tenant spaces were converted to Variable Air Volume systems providing the capability for individual temperature control while drastically reducing energy consumption. Energy costs is estimated to reduce by 50% in fan energy with this installation.