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Double Oven and Microwave Built in Consolidate cooking chores by using a wall oven in conjunction with a microwave. Double oven and microwave built-in make space for counter space and can help save on energy costs by not needing an additional range hood. Contrary to countertop microwaves, which sit on your kitchen counter, built-in models are installed in drawers or cabinets, or are positioned over the range. They tend to be more expensive and require professional installation.