In the Continuous Run operation, the refrigeration unit runs all the time and the direct drive diesel engine that powers the refrigeration system will not shut down except for ‘safeties’ or if the engine stalls. The engine continues to burn fuel and accumulate engine hours. The air inside of the trailer is always moving. This is good for fresh produce. To maintain product quality the unit must operate in Continuous Run. There is a trade-off between economy and product quality. The Continuous Run mode should be used for chilled meat, fresh produce and other temperature sensitive cargoes as these cargoes need continuous airflow and temperature management. In the case of fresh produce, continuous run is also needed to remove the respiratory heat produced by the produce. In short, continuous airflow and temperature management allows for more consistent cargoes temperatures throughout the trailer for the duration of transport.