A dual temp reefer is a refrigerated trailer built with two independently controlled temperature zones. A movable bulkhead splits the space so one section can run frozen while the other stays merely chilled, all in a single trailer.
This lets a carrier combine different perishable products — say frozen goods and fresh produce — on one load instead of needing two trucks. It’s a more specialized version of a standard reefer, and the added capability usually commands a premium.