A data center has equipment racks in which electronic equipment is disposed and a climate control system that includes a computer room air conditioner (CRAC) and an air economizer. The climate control system includes a control module that controls the climate control system. The control module determines whether outside air is suitable for use in cooling the data center based on the dry bulb temperature and humidity of the outside air. If the outside air is not suitable for, only the CRAC is used to cool the data center. If the outside air is suitable for use, outside air and not the CRAC is used to cool the data center when the dry bulb temperature of the outside air is below a minimum outside air dry bulb temperature set point. The outside air is conditioned before it is introduced as supply air into the data center so that the supply air is above a minimum temperature. If the outside air is suitable for use and the dry bulb temperature of the outside air is above the minimum outside air dry bulb temperature set point, the control module determines a cooling percentage of cooling of the data center to be provided by the CRAC and a cooling percentage to be provided by the outside air, where the percentage can range from zero percent to one-hundred percent. The control module then controls the climate control system so that the CRAC and outside air provide cooling of the data center according to their respective determined cooling percentages.
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