An equipment enclosure includes an air exhaust opening and an air intake opening at respective upper and lower regions of the enclosure, and an interior equipment chamber configured to house controlled temperature equipment at a controlled temperature equipment area. A temperature diverter system includes a warm air exhaust subsystem and a warm air circulation subsystem. The warm air exhaust subsystem is operable to vent warm air in the enclosure through the air exhaust opening in order to cool the controlled temperature equipment area. The warm air circulation subsystem is operable to circulate warm air in the enclosure to the controlled temperature equipment area in order to warm that area. The equipment enclosure further includes one or more temperature sensors and a temperature controller for controlling operations of the warm air exhaust subsystem and the warm air circulation system based on input from the temperature sensor(s).