A data center can include at least one computing room, and at least one rack system disposed in the computing room. The rack system includes a rack housing that at least substantially encapsulates an interior space, and a plurality of computing devices mounted to the rack in the interior space. The data center can further include a cooling system. The cooling system includes a conduit that is disposed in the interior space of the rack housing and a fluid that flows through the conduit, wherein heat is transferred from air in the interior space to the fluid to produce cooled air in the rack housing.