The main component of your refrigerator and freezer that should get your attention is the door seals. Keeping your door seals tight will reduce the amount of energy it takes to keep your food cool or frozen, but will also keep your refrigerator working efficiently, preventing premature wear on internal parts.
To test the door seals, close the door on a 5€ note and attempt to pull it out with the door closed. If you cannot easily pull the euro note out from the door, your seals are in good shape. However, if the note slides out without much resistance, it’s time to replace the seals. You can purchase new seals from any home repair outlet store.
Also, if you have a refrigerator that has coils along the back, periodically vacuum these coils to remove dirt and dust build up. These coils contain the coolant the refrigerator uses to keep the internal temperature cold. If they become dirty, they won’t work efficiently and your refrigerator may stop cooling altogether.
As a general tip, keeping your refrigerator full uses less energy than trying to cool when it’s empty. Therefore, keep as many items in your refrigerator as possible to help reduce energy costs.