Codes and Standards – ASHRAE 90.1-2019 Revised Updates

ANSI/ASHRAE/IES Standard 90.1-2019 incorporates all of ANSI/ASHRAE/IES Standard 90.1-2016 and addenda with more than 100 changes, many related to commissioning. Specific updates for building enclosures, lighting, renewables, mechanical, IT, energy budgeting, modeling and energy efficiency. Commissioning, verification and testing requirements are updated to be consistent with ASHRAE/IES Standard 202. A code update at the National Glass Association 2019 Conference, by code consultant Thomas Culp, Ph.D., indicated that the new version includes a continued expansion of daylighting, including better controls and more daylighting areas.

ASHRAE 189.1-2020 Review and Publication Schedule

The next ANSI/ASHRAE/ICC/USGBC/IES Standard 189.1, Standard for the Design of High-Performance, Green Buildings except Low-Rise Residential Buildings, is targeted for publication in fall, 2020. It is intended for buildings that wish to exceed the minimum requirements of ASHRAE/IES Standard 90.1. Standard 189.1 previously served as a compliance option to the International Green Construction Code™ (IgCC) published by the International Code Council. The 2018 IgCC was the first fully integrated edition to be developed cooperatively by ICC and ASHRAE and in 2018 Standard 189.1 essentially became the IgCC in North America ― as phrased by ASHRAE, the “2018 IgCC®, powered by ANSI/ASHRAE/ICC/USGBC/IES Standard 189.1,” which regulates construction of new and remodeled commercial buildings.

Currently available for your public review and comment:

  • Exceptions to demand response program requirements for buildings that employ thermal or electrical energy storage of a specified capacity (second review).
  • New lighting control requirements for [commercial and multifamily] dwelling units based on the demonstrated energy saving effects of dimmers and automatic shut-off controls (first review).

Standard 189.1 provides a “total building sustainability package” for those who strive to design, build and operate green buildings. From site location to energy use to recycling, this standard sets the foundation for green buildings by addressing site sustainability, water use efficiency, energy efficiency, indoor environmental quality, and the building’s impact on the atmosphere, materials and resources.

The last regular public review period for 189.1-2020 including addenda with comments will be in spring 2020 in order to meet the fall publication date.

Also For November Review

  1. ASHRAE Standard 84-2013R: laboratory methods for testing the performance of air-to-air heat and energy exchangers. Due by November 17, 2019
  2. ANSI/ASHRAE/ASHE Standard 170-2017 Ventilation of Health Care Facilities. BSR/ASHRAE/ASHE Addendum d. Due by November 24, 2019 (second review). This proposed addendum adds requirements and language similar to Section 5 (Systems and Equipment) of ASHRAE Standard 62.1, and includes:
  • Air intake separation distance table adapted for 170 requirements.
  • Outdoor air verification requirements while operating.
  • Measures to prevent vehicle combustion in parking garages from entering the building.
  • Air balancing requirements.

Technical Peer Review on Achieving Zero Energy

In partnership with AIA, IES, and USGBC and with support from the DOE, ASHRAE is developing a new series of Advanced Energy Design Guides focusing on achieving zero energy performance by building type. Right now, ASHRAE is conducting Preliminary Technical Peer Review of the third guide in the series, Advanced Energy Design Guide for Multifamily Buildings – Achieving Zero Energy. To participate in this particular document review you must act immediately. Go to for a free download of the review process instructions and review input form as well as a copy of the document for review (in pdf format). However, if you miss this review period, additional design guides will follow.

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