1.Do not put too much in the chamber.
2.Package the goods and cool it before putting it into refrigerator.
3.Do not open the door too frequently or open much time once.
In addition: When it comes into monsoon, the air are much moist and hot,it is easily to be frost in the refrigerator. So in this period, you'd better adjust the temperature of refrigerator to a little higher which can decrease the different temperature between the inside and outside of the refrigerator.