HUD has taken steps to promote energy efficiency by providing information, training, and technical assistance, but its efforts have limitations. HUD has also provided some financial incentives to promote green building, including energy efficiency, for public housing and for a small segment of the multifamily properties HUD supports. Additionally, HUD has developed some performance measures to track the progress of its energy efficiency efforts. However, HUD has not begun requiring energy-efficient products and appliances in its public housing properties, as required by statute. HUD has also not implemented major energy efficiency updates to the building code for manufactured housing in more than a decade. Without such requirements and updates, public housing authorities may be spending more on utility expenses than is necessary and manufacturers may lack an incentive to build energy-efficient manufactured homes.