The City of Boston required 55 West Broadway to update the residential buildings’ existing air-cooled chiller to meet strict low sound levels. The sound goal was 50dBA at 23 feet. As basis of design, HTS equipped the chiller renovation with one TSI Ultra-Low-Sound Air-Cooled Chiller to meet the sound goal. TSI engineered the chiller in support of the specific application for 55 West Broadway, allowing the custom chiller to fit in place of the existing chiller, while meeting the very strict sound requirement mandated by the city.