Free Download: ASHRAE/IES Standard 90.1-2007 I-P
To promote energy efficiency, ASHRAE and the US Department of Energy are making Standard 90.1-2007 (I-P Edition) available for free download (PDF).
Standard 90.1 has been a benchmark for commercial building energy codes for over 35 years. It is an indispensable reference for engineers and other professionals involved in the design of buildings and building systems. The 2007 edition serves as the basis of many building codes.
The print edition of 90.1-2007, as well as a User's Manual, are available for purchase in the ASHRAE bookstore. The latest version of the standard, Standard 90.1-2010, is now available for pre-sale.
Click here to begin the download.