In recognition of the need for energy conservation in HVAC pumping processes, this paper was written to demonstrate the broad energy consumptions that occur same chilled water system. Annual with four different pumping schemes for the consumptions of pumping energy vary from 570,000 kWh for constant volume pumping to 177,000 kWh for variable-speed building pumps. This paper describes the four different pumping systems and the methods and procedure used to calculate the annual energy consumptions.