Most modern cruise ships, including those from P&O, Royal Caribbean, and Celebrity, do include a small cooling unit in nearly every cabin category, but it is important to manage your expectations. These units are often thermoelectric coolers rather than true compressor-based refrigerators. This means they are designed to keep already-chilled beverages cool, usually maintaining a temperature about 30 degrees Fahrenheit below the ambient room temperature, but they may not be cold enough for the safe storage of highly perishable items like milk or certain medications. On many lines, these "mini-bars" come pre-stocked with sodas and snacks for a fee, but you can ask your cabin steward to empty them so you can store your own items. If you have a medical requirement for a "real" refrigerator (for insulin or other temperature-sensitive meds), you should notify the cruise line's accessibility department at least 30 days before sailing; they can often provide a medical-grade unit or ensure your cabin has a higher-performance fridge at no extra cost.