A convection oven has a fan that circulates hot air throughout the oven. The heated airflow can cut down on cooking time and thus your electric bill. The convection oven combines heating coil units with fans the force the hot air through the oven, causing it to circulate more efficiently around the food. This advantage produces evenly browned food in a more energy-efficient way.
The advantages of the convection oven are many. Your food is heated more evenly and there is less burning. You also cook faster and at lower temperatures which saves on your energy bill. Some convection ovens come with a built in rotisserie rack, because the more evenly distributed heat makes roasting better. There is less food shrinkage due to the lower temperature and shorter time, so there is more to eat. You can also put a lot more in the oven and get it all cooked. The more you put in a regular convection oven the longer it takes to cook everything. And something on the top rack won't cook at the same speed as something on the bottom. With a convection oven, everything gets heated the same, so you can fill it up and it will all cook at the same time, at the speed it is suppose to. Professional cooks prefer convection ovens because of their efficiency and superior results. Breads are lighter and roasts retain their juices while requiring less time and energy.