You can save extra bucks by keeping your refrigerator set to 36°F and your freezer to 0° F and no lower to run it efficiently. It bears repeating that a full freezer requires less energy to keep cool than an empty one. So fill yours up. You can fill empty water or soda bottles with water and freeze them to take up space if you need to. These will come in handy when packing coolers. You’ve made ice packs!