Dive Brief:

• The newest revisions to Standard 90.1  are intended to decrease the power density of interior lighting and increase efficiency of HVAC equipment.
• One strategy is to increase daylighting, and the standard requires double-glazed windows in more places and sets a minimum ratio for a window's ability to transmit light while not conducting solar energy.
• The standard is a joint project of the American Society of heating, Refrigeration and and Air-conditioning Engineers, the American National Standards Institute and the Illuminating Engineering Society of North America.

Dive Insight:

It will probably take a while for the 2013 standards to work their way into building practice. The newest version of LEED environmental standards employs a 2010 version of 90.1, and building codes often reference 2004 or 2007 requirements.