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Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings

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Standard 90.1

ANSI/ASHRAE/IES Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings

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SI Edition Coming Soon


90.1 Portal

With 90.1 Portal, view the standard and User’s Manual side-by-side in an all-new interface. Copy, paste, print, and annotate content with one click, and see interpretations, addenda, and errata in the context where they matter. Subscriptions are also available for a local network to provide affordable access for your entire office. Learn more


90.1 Training

ASHRAE continually offers several training options related to 90.1 including instructor-led training, on-demand eLearning, self-directed training, and training in conjunction with ASHRAE and other industry events. See the various options and sign up by viewing our Professional Development page.


More Ways to Buy:

ASHRAE now offers publications in multiple formats so you can select the option that's best for you.

Printed Edition + PDF bundle—Purchase Standard 90.1-2019 in print format and get electronic online access in PDF format, in addition to your print copy, for one low price.

Multi-user PDF—Purchase access to Standard 90.1-2016 for use in your company for up to nine users.

Digital Collections—Need company-wide access? Digital Collections provide web-based, enterprise access to ASHRAE and other-industry publications for your information needs.


About Standard 90.1-2019

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.

Preview | 90.1-2019

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. 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 efficiency 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.

The 2019 edition includes various modifications and clarifications to improve internal consistency and to standardize the structure and language of the document. Significant changes to requirements include the following:

Administration and Enforcement

  • New commissioning requirements in accordance with ASHRAE/IES Standard 202

Building Envelope

  • Combined categories of “nonmetal framed” and “metal framed” products for vertical fenestration
  • Upgraded minimum criteria for SHGC and U-factor across all climate zones
  • Revised air leakage section to clarify compliance
  • Refined exceptions related to vestibules, added new option and associated criteria for using air curtains

Lighting

  • Modified lighting power allowances for Space-by-Space Method and the Building Area Method
  • New simplified method for lighting for contractors and designers of renovated office buildings and retail buildings up to 25,000 ft2 (2300 m2).
  • Updated lighting control requirements for parking garages to account for the use of LEDs
  • Updated daylight responsive requirements, added definition for “continuous dimming” based on NEMA LSD-64-2014
  • Clarified side-lighting requirements and associated exceptions

Mechanical

  • New requirements to allow the option of using ASHRAE Standard 90.4 instead of ASHRAE Standard 90.1 in computer rooms that have an IT equipment load larger than 10 kW
  • Added pump definitions, requirements, and efficiency tables to the standard for the first time
  • New equipment efficiency requirement tables and changes to existing tables
  • Replaced fan efficiency grade (FEG) efficiency metric with fan energy index (FEI)
  • New requirements for reporting fan power for ceiling fans and updated requirements for fan motor selections to increase design options for load-matching variable-speed fan applications
  • New energy recovery requirements for high-rise residential building
  • New requirement for condenser heat recovery for acute care inpatient hospitals

Energy Cost Budget (ECB) Method (Section 11)

  • Numerous changes to ensure continuity
  • Set baseline for on-site electricity generation systems

Performance Rating Method (Appendix G)

  • Clarified Appendix G rules and corresponding baseline efficiency requirement when combining multiple thermal zones into a single thermal block
  • New explicit heating and cooling COPs without fan for baseline packaged cooling equipment
  • New rules for modeling impact of automatic receptacle controls
  • Set more specific baseline rules for infiltration modeling
  • Clarified how plant and coil sizing should be performed
  • Updated building performance factors

Both Compliance Paths

  • Clearer, more specific rules for treatment of renewables
  • New updates to rules for lighting modeling

Superseded Editions of 90.1

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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 90.1-2019 product page.

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Standard 90.1-2016 User's Manual

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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 90.1-2016. 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. The Standard 90.1-2019 User's Manual is not yet available. To receive a free automatic notification when it becomes available, click the Purcahse link below and select the "Track It" link from the right corner of the page. 

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Other Available Resources

90.1-2013 User's Manual

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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 Internaions Energy Conservation Code

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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.


Related Courses

Air-to-Air Energy Recovery Applications: Best Practices

Air-to-Air Energy Recovery Fundamentals

Air-to-Air Heat Recovery Fundamentals and Applications (MENA)

ASHRAE 90.1 Code Compliance and Plan Review for Authorities Having Jurisdiction

Basics of High-Performance Building Design

Choosing the Right Energy Code for your Project—IECC 2018 or ASHRAE 90.1-2016

Complying with Standard 90.1-2010 

Complying with Standard 90.1-2010: Envelope/Lighting

Complying with Standard 90.1-2010: HVAC/Mechanical

Complying with Standard 90.1-2013 

Complying with Standard 90.1-2013: Envelope/Lighting

Complying with Standard 90.1-2013: HVAC/Mechanical

Complying with Standard 90.1-2016

Complying with Standard 90.1-2016: Envelope/Lighting

Complying with Standard 90.1-2016: HVAC/Mechanical

Energy Modeling Best Practices and Applications

Exceeding Standard 90.1-2013 to Meet LEED® Requirements

Exceeding Standard 90.1-2013 to Meet LEED® Requirements 

Evaluation Methods for High-Performance Green Buildings

How Smart, Efficient, Sustainable Systems Lead to Improved Resilience

Introduction to Buildings Enclosure Commissioning

Save 30% Complying with ASHRAE Standard 90.1-2013

Save Over 35% Using Appendix G of ASHRAE 90.1-2016

Significant Changes to Standard 90.1-2010

Significant Changes to Standard 90.1-2010 and IECC-2012 (co-sponsored with ICC)

Standard 90.1: HVAC/Mechanical and Appendix G (MENA)


90.1 ECB App

A tool for modeling compliance with ASHRAE Standard 90.1-2010

What This Tool Can Do for You:

A free web application from ASHRAE automates the calculations needed to show a building project’s compliance with ASHRAE/IES Standard 90.1-2010 using the Energy Cost Budget (ECB) Method described in the standard. The calculations are based on the ECB Method Compliance Forms found in the 90.1-2010 User's Manual.

Input your project parameters and then calculate your proposed design’s projected performance and compliance—no need to build your own spreadsheet. Output your results in Microsoft® Excel® for your clients and project records.

The app is accessible from your desktop, tablet, or other device anywhere. Set up an account  and store your project information in one place for easy reference and comparison.

Visit 901ECB.ashrae.org to register and get started.

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