ENERGY CODES Commercial building energy codes vary by state and even local jurisdiction. Despite convergence in the major energy standards—ASHRAE’s 90.1 and ICC’s International Energy Conservation Code (IECC)—the nation is a patchwork of codes, some based on 90.1 (1989, 1999, 2001, 2004, 2007), with or without amendments; some based on IECC (2003, 2006, 2009), with [...]