In 2018 the RTF mounted a concerted effort to increase emphasis on whole building energy efficiency. As energy efficiency programs seek deeper savings, they are exploring approaches that focus on the energy use of the building as a whole, rather than taking an end use by end use approach. In January 2018, the RTF discussed the results of a scoping exercise during which regional stakeholders were interviewed regarding their needs in the whole building energy efficiency space. This project also compared existing national guidance documents on estimating savings from a whole building approach to understand what is currently being addressed. Through this effort, the RTF identified some gaps in these existing guidance documents, particularly around estimating the costs and lifetimes of whole building program approaches. The RTF directed staff to continue to explore this space, focusing on areas lacking guidance and engaging in other efforts to provide clarity where needed.