A movable data center comprising a portable enclosure in which a data processing module is operatively disposed. The data processing module is assembled onto a rack located in the enclosure that is movable between and operative position and a service position. A heat exchange module is arranged in the enclosure in air flow communication with the data processing module on the rack. The rack may be moved from the operative position in which the rack is in air flow communication with the heat exchange module to the service position in which the rack is not in air flow communication with the heat exchange module.