Gain full access to the most critical updates of the 2012 International Energy Conservation Code® and ANSI/ASHRAE/IES 90.1-2010, the real-world application of those changes, and why they originated. Each change analysis features the affected code and Standard sections and identifies the change as newly added text, a modification of the existing language, or deleted text. Accompanying each change are detailed illustrations and examples, which bring the technical language of the code to life in a real-world setting.