The upper limit of cold storage refers to the highest temperature of goods stored in cold storage, and the lower limit refers to the lowest temperature. The upper and lower limits of cold storage refer to the temperature range of goods stored in cold storage, which may be different according to the types of goods and storage requirements. For perishable goods such as frozen meat, the upper limit is between-18℃ and -20℃, and the lower limit is between -25℃ and -30℃.