Abstract: A frost control system for preventing the accumulation of frost on components of a freezer door assembly is disclosed. The system comprises a movable door disposed between a cold space and a warm space, and a header assembly. The header assembly comprises an air mover and an air inlet adapted for drawing air from the cold space to an inlet of the air mover. A conduit is provided for conducting air from an outlet of the air mover to a region of the warm space proximate to the door, and a thermostatically-controlled heater is disposed within the conduit. The conduit includes a heated air exhaust vent. Also provided is control circuitry for managing the operation of the heater and air mover.