Program Overview: The ARPA-E Single-pane Highly Insulating Efficient Lucid Designs (SHIELD) program seeks to reduce this consumption by funding the development of energy-efficient and cost-effective retrofits for the substantial remaining stock of single-pane windows in the U.S. ARPA-E analysis indicates that a fully successful single-pane retrofit campaign will reduce total building energy consumption by 1.2 quads, or 1.3% of domestic energy use. As envisioned in this SHIELD program, it will also address the water condensation and occupant discomfort that are associated with single-pane windows in cool climates. SHIELD will support research on three broad technology categories. The first category will enable products that are applied onto existing windowpanes. The second is for manufactured windowpanes with similar weight and thickness to current panes, and that could be installed as replacements for existing windowpanes without necessitating replacement of the sash in which the pane is mounted. For both of these research categories, the program’s primary goals are to develop cost-effective technologies (i) to improve the thermal insulation (U-factor) and (ii) to reduce cold weather condensation of single-pane windows. A secondary goal of the SHIELD program is to develop synergistic improvements in window performance such as soundproofing that would make these window retrofits highly desirable to building occupants and owners. ARPA-E envisions that these technologies will be used in both the residential and commercial building sectors, and that the impact of the retrofits on the appearance of the window will be minimal. In addition to the two categories for comprehensive technology development, as a third category, SHIELD will support proof-of-principle development of innovative components that will enable superior performance in the first two technology categories. To obtain a copy of the Funding Opportunity Announcement (FOA) please go to the ARPA-E website at https://arpa-e-foa.energy.gov. ARPA-E will not review or consider concept papers submitted through other means. For detailed guidance on using ARPA-E eXCHANGE, please refer to the ARPA-E eXCHANGE User Guide (https://arpa-e-foa.energy.gov/Manuals.aspx).