The U.S. Department of Energy (DOE) issues standards regulations for energy conservation pursuant to the Energy Policy and Conservation Act of 1975, as amended, and other authorities. These standards regulations apply to certain consumer products and commercial and industrial equipment. These can include air conditioning and heating systems, washing machines, and commercial refrigeration, among numerous other examples. DOE issues standards regulations by rulemaking and includes quantitative maximum water and energy use or minimum energy conservation standards. There are currently standards regulations for more than 70 product classes (i.e., a specific type of consumer product or commercial or industrial equipment). This report reviews the assumptions, models, and methodologies that DOE uses in setting the quantitative portion of the standards regulations following the Office of Management and Budget's guidance on the use of scientific information. Review of Methods Used by the U.S. Department of Energy in Setting Appliance and Equipment Standards makes findings and recommendations on how DOE can improve its analyses and align its regulatory analyses with best practices for cost-benefit analysis.