ANSI/ASHRAE/IES Standard 90.1-2013 -- Energy Standard for Buildings Except Low-Rise Residential Buildings
Standard 90.1 has been a benchmark for commercial building energy
codes in the United States and a key basis for codes and standards
around the world for more than 35 years.
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Superseded Editions of 90.1
Looking for previous revisions?
ASHRAE offers superseded editions of Standard 90.1 and User's Manuals in the ASHRAE Bookstore. Find previous editions in the 'Document History' section of the 90.1-2013 product page. Browse Now
About Standard 90.1
This standard provides the
minimum requirements for energy-efficient design of most buildings,
except low-rise residential buildings. It offers, in detail, the minimum
energy-efficient requirements for design and construction of new
buildings and their systems, new portions of buildings and their
systems, and new systems and equipment in existing buildings, as well as
criteria for determining compliance with these requirements. It is an
indispensable reference for engineers and other professionals involved
in design of buildings and building systems.
This 2013 edition has been expanded to include new features and more
detailed requirements, as well as incorporating changes from more than
New for 2013:
Revised, stricter opaque element and fenestration requirements at a reasonable level of cost-effectiveness
Improvements to daylighting controls, space-by-space lighting power density limits, and thresholds for toplighting
Revised equipment efficiencies for heat pumps, packaged terminal
air conditioners (PTACs), single package vertical heat pumps and air
conditioners (SPVHP and SPVAC), and evaporative condensers
New provisions for commercial refrigeration equipment and improved controls for heat rejection and boiler equipment
Improved requirements for expanded use of energy recovery, small-motor efficiencies, and fan power control and credits
Improved equipment efficiencies for chillers
Clarifications for the use of prescriptive provisions when
performing building energy use modeling, and revisions to enhance
capturing daylighting when performing modeling calculations
A new alternate compliance path to Section 6, "Heating,
Ventilating, and Air-Conditioning," for computer room systems, developed
with ASHRAE Technical Committee (TC) 9.9.
In addition to offering immediate access to the content, the PDF download of this standard presents selected graphics in color for
Other Available Resources
90.1-2013 User's Manual
This User's Manual provides detailed instruction for the design of commercial and high-rise residential buildings to ensure their compliance with ANSI/ASHRAE/IES Standard 90.1-2013. It includes measurements and calculations in both I-P and SI units, sample calculations, application examples, forms to demonstrate compliance, and references to helpful resources and websites.
ICC -- Significant Changes to the International Energy Conservation Code and ANSI/ASHRAE/IES Standard 90.1-2010
Gain access to the most critical updates, 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 added text, a modification of the existing language, or deleted text. Detailed illustrations and examples accompany each change.