A transit container, such as a rack-mount style container, includes a temperature control system for maintaining a desired temperature within the container such that any cargo within the container remains operational at selected times and possibly in selected locations. The temperature control system includes support or mounting brackets, a temperature control assembly, shock isolation devices for shock attenuation of the temperature control assembly, exhaust assemblies that include exhaust fans and exhaust/intake louvers, and a mounting plate attachable to a lid of the transit container. The temperature control assembly and the aforementioned components may be arranged to have a low-height profile or envelope, which in turn permits the temperature control system to be located in a cavity or chamber of the lid.