At Honolulu Hale, The Department of Design and Construction oversaw the installation of energy efficient air conditioning, lighting, and controls systems. Two new centrifugal chillers, an induced draft cooling tower, a chilled water loop with variable speed pumping power, a new energy management system, and direct digital controlled air handling units were part of the energy efficiency upgrade. In addition, T-8 fluorescent lamps and LED exit signs were installed throughout the building. The energy efficient measures alone reduced energy consumption by nearly 46%.
However, additional efficiencies were realized with the installation of a 200 kW combined heat and power (CHP) system that supplies electric power to the facility and uses “waste” heat to serve a 55 ton absorption cooling system, among the first in the state.