Double ovens were first introduced in the 1980s. General Electric describes the advantages of the double oven in an ad this way: "[The] double oven allows you to cook two different dishes at two different temperatures at the same time." There are, in fact, many other advantages to owning a double oven.
Cook Different Flavors
Have you ever been burdened with with an instance such as having to put fish in the oven at the same time you wanted to bake brownies? No one wants to bake these two items at the same time. The smell of the fish might alter the taste of the brownies.
Double Oven Info boasts about this advantage, "cook multiple items of different types" (reference 1). Cook the fish in the upper oven and the brownies on the lower oven.
Timing food preparation so that everything is ready at the same time is hard; especially when one dish requires a preheated temperature of 375 degrees and the other dish requires broiling on 500 degrees. As one dish finishes cooking, the second dish begins. Therefore the first dish begins cooling off, while the second dish cooks.
Using two ovens can eliminate this hassle of food preparation. No one wants a cold meal, but with double ovens you can cook different items on different temperatures, timing the final product perfectly.
Option of Safety
Children are notorious for getting into things they shouldn't and touching things that are full of danger. If you are only cooking one dish, and only need one oven, using the upper oven cuts back on possible dangers in the kitchen.
Babies have been burned accidentally by opening an oven while it is on and extremely hot. By using the upper oven, the child may accidentally open the lower over, which is off and acquire no injuries.
Large Families Benefit
According to Double Oven Info, one advantage of a double oven is being able to comply with the demands of a large household. The more people who live in the home, the more useful the ability to prepare different foods in two separate ovens becomes.
Preparation of separate meals would require extensive planning if household members had to schedule times to use a single oven. By using double ovens, the stress of determining who cooks when is eliminated.
Cost Worthy Investment
According to Lowe's Home Improvement, as of 2009, a 27-inch stainless steel single oven by General Electric costs about $2,000 while a 30-inch stainless steel double oven runs about $2,350.
For $350 dollars you are getting a second oven and three nches more space in each oven compared to the single oven. The cost is worth the luxury in this matter.