transport refrigeration unit

Transport refrigeration units (TRUs) are climate-controlled devices that provide essential cooling or heating for consumer products being transported in various containers. They maintain a steady temperature for goods during transport or storage and allow the trailer to be cooled when the engine is shut off.

TRUs are also subject to state and federal regulations, most recently in the CARB TRU regulation mandating that owners and operators of truck TRU fleets in the state of California switch to zero-emission vehicle (ZEV) TRUs by a specified date.