Hyatt Regency Chicago is a 1,886,000-square-foot luxury hotel consisting of two towers housing 2,019 rooms, located near Chicago's famous Magnificent Mile. The hotel has 228,000 square feet of flexible function space, including four ballrooms; 63 meeting rooms, and the 70,000-square-foot Riverside Convention Center. The purpose of the project was to replace the existing 1,500-ton chiller plant serving the West Tower of the hotel. The existing chillers and cooling towers were almost 40 years old and past their useful service life. The original chilled water system was constant flow.