Disclosed is a containerized heating, ventilation, and air-conditioning (HVAC) system comprising an HVAC unit and one or more ducts from the HVAC unit to an equipment rack. The ducts prevent mixing between the fresh and exhaust airflow, thus improving efficiency. Sensors located at sources of heat generating equipment within the racks may be used by controllers to monitor temperatures of the components at the source of heat generation, typically at the highest temperatures. The temperatures may be aggregated to determine the temperatures of devices, modules, racks, and the container interior cavity. Dampers on the ducts, at the rack inlets, at the module inlets, at the devices inlets, and such may assist in regulating airflow preferentially to the hottest components, devices, modules, or racks.