The invention relates to a managing method for the setting value (a managing device for the setting value) for the further energy saving under the situation of setting the temperature setting value isothermal environment as the benchmark setting value. Once reaching the appointed moment, the device can judge whether the current mode is the refrigerating mode or the isothermal mode. For instance, under the situation of refrigerating mode, comparing the current temperature setting value tsp to the benchmark setting value TCR, the tsp is less than the TCR, the current temperature setting value tsp is changed to the benchmark setting value TCR (allowing reposition); if the tsp is more than or equal to the TCR, the current temperature setting value tsp maintains the current value (forbidding the reposition). Thereby, the invention is only changed to the benchmark setting value under the situation of judging the energy saving direction to avoid the increased direction change of the temperature setting value.