This report presents the results of a California Institute for Energy Efficiency (CIEE) exploratory project to develop a new high-performance insulating material, gas-filled panels (GFPs), that is not based on chlorofluorocarbons (CFCs). Applications for GFPs are widespread, with a primary focus on refrigerator/freezer appliances and building walls. While this project has proven the thermal performance potential of GFPs, further development is necessary to optimize designs for cost, manufacturing, and performance.