The interior of the carriage should be kept clean, and there should be no packaging paper or paper scraps on the ground, as debris can hinder air flow or be sucked in by the evaporator.

When using a refrigerated truck, the floor of the compartment should be kept clean. Due to the action of the evaporator fan, air will circulate inside the cabin, causing debris or dirt on the ground to be sucked in by the evaporator fan. Long term use can cause a large amount of impurities to be sucked into the evaporator coil, thereby affecting the refrigeration efficiency of the refrigeration unit. Because the coil will be gradually surrounded by impurities, resulting in a decrease in the heat exchange rate of the coil. So after using a refrigerated truck for a few years, people may feel that the cooling effect is not as good as it started, not only due to its own malfunction, but also because the coil is too dirty. Therefore, ensuring the cleanliness of the floor in the carriage is the key to ensuring the normal operation of the refrigeration unit.

Proper handling, the freezer should be turned off when the car door is opened, and the time for the door to open should be minimized as much as possible. When loading and unloading goods, strip door curtains should be used as much as possible. Use partitions to separate dry goods (empty baskets) from perishable items.

In order to ensure the temperature of the goods inside the carriage, it is recommended to use strip door curtains for urban delivery vehicles to ensure that the cold air inside the carriage will not quickly dissipate when unloading quickly (without turning off the refrigeration unit). Goods with different temperatures are strictly prohibited from being stored in the same compartment space. They should be placed separately with partitions. Due to the fact that refrigerators are used to maintain the temperature of goods, rather than to cool them down, mixing goods of different temperatures can affect the temperature of the goods and lead to an impact on their quality. Proper operation and use of refrigerated trucks are key to ensuring the quality of temperature controlled goods. It is also where the refrigeration equipment can work normally.