says the Department of Energy these 20 percent convection oven $36 annually save you money more efficient $36 annually 50% more energy save you money $36 annually conduct heat faster $36 annually less heat and reduced time in the oven Microwave ovens use less energy $36 annually save you money more than 40 percent less heat and reduced time in the oven less heat and reduced time in the oven less heat and reduced time in the oven U.S. Department of Energy save you money [Source] save you money save you money Microwave ovens use less energy Before you start cooking 20 percent less energy DOE Before you start cooking save you money U.S. Department of Energy $36 annually Before you start cooking energy.gov website