A thermal management system for a display case having a corner in which a lighting system is located is provided. The lighting system includes a reflector and a light source that generates heat and is mounted with the reflector. A lighting system support is positioned in the corner of the display case and is associated with the lighting system. A mullion is positioned between the lighting system support and the lighting system. The mullion maintains a desired relative position between the lighting system support and the lighting system. A contactor is located between the lighting system support and the lighting system, and provides minimal thermal conduction between the lighting system support and the lighting system. The contactor thus reduces heat transfer from the heat-generating light source to the lighting system support, thereby reducing an amount of heat transferred to the corner of the display case.