An energy exchange system employing a hot water loop, a chilled water loop, an energy exchanger, a boiler plant for heating water flowing through the hot water loop and for heating water flowing through the chilled water loop via the energy exchanger, a chiller plant for chilling the water flowing through the chilled water loop and for chilling the water flowing through the hot water loop via the energy exchanger, and a control for calculating a hot energy load for operating the at least one boiler to heat the water flowing through the hot water loop and for heating the water flowing through the chilled water loop via the energy exchanger, and for calculating a chilled water energy load for operating the at least one chiller to chill the water flowing through the chilled water loop and for chilling the water flowing through the hot water loop via the energy exchanger.
