This is not a weather forecast! However, these are the perfect temperatures for a regular refrigerator and freezer, respectively. It doesn’t waste unnecessary electricity to keep them colder, and your food stays fresh longer.
Consider thawing your items in the refrigerator instead of using the microwave or hot water. This way, the cold benefits the refrigerator and thus uses less energy. Similarly, it’s good to let food cool down before placing it in the fridge. Otherwise, it will heat up the other items already inside.
An empty refrigerator uses more energy than a well-stocked one, so if there’s extra space, you can fill it with canned goods. To maintain the cold temperature, it’s also best to close the door as quickly as possible.
Defrost the freezer when ice has accumulated. Don’t forget to vacuum behind the refrigerator and around the compressor. If it becomes too dusty, the cooling system will require lots of unnecessary electricity.