Five or seven gears. In summer, the temperature is high, so it is effective to set the refrigerator to 3-4, but in winter, if the thermostat is still set at a low level, the temperature difference between inside and outside is small, the compressor is not easy to start, and the refrigerator with a single refrigeration system may freeze in the freezing room, so it is best to set the refrigerator to 5-7 in winter. 1, refrigerator is a kind of refrigeration equipment to keep a constant low temperature, and it is also a civilian product to keep food or other items at a constant low temperature. When the refrigerator is normal in winter, it can be adjusted between 4-6 gears. As the thermostat gear should be adjusted according to the seasonal temperature change, it is generally recommended to use gear 4-6 in winter and gear 3-4 in case of gear 5. It can also be determined according to the amount of food in the refrigerator. Eat 4-5 grades less and 5-6 grades more. 2. The refrigerator has only one thermostat that can control the temperature, and the refrigeration temperature should be controlled between 0- 10 degrees. However, due to the low temperature in winter, it is easier for the refrigerator to reach the set temperature. If the set temperature is too high, the start-up time of the refrigerator will be short, and the refrigeration effect will not be achieved. There are cabinets or boxes with compressors and ice makers in the refrigerator, and there are also storage boxes with refrigeration devices. When the indoor temperature is lower than 16, the refrigerator should be set to 5; when it is lower than 10, it can be adjusted to 6 or 7. Generally speaking, the greater the temperature difference between inside and outside the cabinet, the smaller the temperature difference between inside and outside the cabinet, but the greater the adjustment of temperature control coefficient.