Data center modular systems

A data center system, comprising:

• an upper module comprising an air conditioning module;
• a lower module attached to the upper module and configured to suspend above a floor of a human-occupiable workspace of a data center building that supports a plurality of racks comprising a plurality of heat-generating electronic devices, the lower module comprising a power support assembly configured to provide electrical power to the plurality of heat-generating electronic devices;
• a roller or slider assembly attached to a frame of the upper module, the roller assembly comprising at least one roller or slider;
• and
• a rail assembly attachable to a structure of the data center building, the rail assembly comprising a beam engageable by the roller or slider.

A method of conditioning a data center comprising:

• installing a first module of a data center cooling system on a rail assembly attached to a data center building, the first module comprising a frame and an air conditioning module;
• attaching a second module of the data center cooling system to the first module, the second module comprising a panel attached to the frame of the first module and sides that extend from the panel to suspend over a floor of the data center building;
• and
• moving the first and second modules of the data center cooling system adjacent to at least one row of a plurality of data center racks that support a plurality of heat-generating electronic devices by moving the first module on the rail system through a human-occupiable aisle of a workspace of the data center building defined between rows of columns of the data center building.