A series of Advanced Energy Design Guides were developed in cooperation with ASHRAE (American Society of Heating, Refrigerating and Air-Conditioning Engineers), AIA (The American Institute of Architects), IESNA (Illuminating Engineering Society of North America), USGBC (United States Green Building Council) and US DOE (United States Department of Energy) in 2011. These guides were aimed at achieving 50% Energy Savings toward a Net zero-energy building and covered the building types of Small to Medium Office Buildings, Medium to Big Box Retail Buildings, Large Hospitals and K-12 School Buildings. In Climate Zones 4 and above the recommendation is to follow the ASHRAE 90.1 standard for roof reflectance, which currently does not require roofs to be reflective in these zones. In Climate Zones 4 and above, Cool Roofs are not a recommended Design Strategy.