At 15,000 MBH (450 boiler horsepower), One Rotary Center is home to one of the largest condensing boiler plants in the United States.
- A new mechanical equipment penthouse was constructed on top of the building’s parking garage and immediately adjacent to the existing fourth floor main mechanical room. The existing electric boilers were demolished, and the heating and cooling systems were segregated and control schemes revised to operate in a more conventional manner.
- More than 2,000 tons of greenhouse gas emissions were eliminated — a reduction of 80% — by using the condensing boiler plant instead of the old equipment combination of heat pumps and electric boilers.
- Utility cost savings during the first season of operation were estimated at $127,000, based on an avoided electrical cost of $206,000 and an added natural gas cost of $79,000.