A 976,000 square-foot office building in the Chicago Loop
NSU (night set-up) defines the normal temperature setpoints (thermostat settings) programmed into the building automation system. Typically the setpoints are set up in temperature at the end of occupancy – thus shutting down HVAC operation – and set down in temperature in the early morning – to restart HVAC operation in advance of building occupancy. OPT (OPTimal) defines the setpoints recommended by CUE to reduce a building’s HVAC expense. Actual is what was achieved by employing the OPT setpoint strategy.
Supplier's energy cost was reduced by 18%, on-peak energy was reduced by 24%, and peak demand was reduced by 25%.