A climate control system or a data center includes a computer room air conditioner (CRAC) and an air economizer. A control module determines whether outside air is suitable for use in cooling the data. 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 set point. The outside air is conditioned before it is introduced as supply air so that it 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 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.
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