The following is a chronological progression of events involving regional standards for nonweatherized residential furnaces, central air conditioners, and heat pumps. This list was last updated on April 19, 2013.
• Dec. 19, 2007 — President George W. Bush signs the Energy Independence and Security Act of 2007 (EISA) into law. The legislation provides Bush the authority to establish regional standards for residential furnaces and central air conditioning equipment.