The cost of owning and operating a double wall oven is much the same as a single oven, and varies depending on usage and your model. Whether you’re cooking with electric or gas, your utility costs will range between 12 and 36 cents per hour, though this may tend toward the higher end if you’re using two ovens at once. Repairs are another common cost, and the most common involve a malfunctioning control panel, damaged heating coil, or broken self-cleaning function. Any of these can cost between $100 and $600 to fix.