They are mainly used for the preservation of fresh food, beverages or medicines. Freezing cold rooms or negative temperature cold rooms are used to keep frozen products between 0 and -28C. They usually have better insulation and fewer daily openings.
Almost all dairy products need to be stored in the refrigerator. The exceptions include powdered milk products, and products such as UHT (Ultrahigh temperature) products, which can be stored in the pantry, or ice cream which needs to be stored in the freezer.