In addition to being fast, convenient and easy to clean, it turns out an air fryer can also save you money each month. Because of the smaller cooking chamber, air fryers generally cook foods much faster than your traditional gas or electric stove. It often takes about half the time it takes to make a similar recipe in a full oven, meaning it requires a lot less energy. Additionally, air fryers don't need to preheat either, making them even more efficient. The average full-size oven takes at least 10 minutes to preheat, and preheating requires as much energy as actual cooking. However, an air fryer is not a replacement for an oven. There are plenty of foods that you probably won't want to cook in an air fryer, or just won't fit in a standard air fryer.