The project’s $9-million first phase deployed thermal networking to reduce energy demand and to eliminate carbon emissions that could trigger Local Law 97 penalties in 2030.

Photo courtesy Consigli Construction Co.

The 1931 masonry office building has steam heat and cast iron radiators that wrap around each of its 17 floors, totaling 970,000 sq ft. During a tenant turnover, crews upgraded floors with heat pumps on each floor that exchange energy with other floors. The pipes between floors are connected—allowing excess heating and cooling to be moved between them to further conserve energy.

Photo courtesy Consigli Construction Co.

The retrofit also involves plugging into a recently erected building next door that can effectively act as a battery. About 120 ft below the new building, a reservoir that can store water at stable temperatures was drilled so it does not have to be heated or cooled as much before being circulated through the buildings. The structure also has concrete floors lined with piping to warm and cool spaces instead of using radiators. A ventilation system in both buildings also helps conserve energy by recapturing it from air leaving the building.

Photo courtesy Consigli Construction Co.

An approximately 12-month design period involved planning 20 sequences for the roof work to be completed without affecting tenants.

Photo courtesy Consigli Construction Co.

When the full project finishes around 2030, the building’s emissions will be reduced by at least 70% annually.