ASHRAE Standard 100 users' guide
Publication date: April 24, 2024On this Page
About ASHRAE 100
ANSI/ASHRAE/IES Standard 100-2018: Energy Efficiency in Existing Buildings (ASHRAE 100) provides processes and procedures to reducing energy consumption and carbon emissions of all types of existing buildings, including residential, commercial, institutional, and industrial.
It was developed by the American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE), approved by the American National Standards Institute (ANSI), and co-sponsored by the Illuminating Engineering Society (IES).
Although ASHRAE 100 is not required by the BC Building Code, it can help owners and managers create a plan to reduce emissions, energy use, and operating costs of existing buildings.
About the users' guide
This users' guide provides additional explanation, examples, and reference material to supplement ASHRAE 100.
The guide shows how different people and groups responsible for a building can contribute, including:
- Building owners, managers, and operators
- Local governments (Authority having jurisdiction)
- Energy managers and qualified energy auditors
- Qualified persons determining compliance
The guide is generally applicable anywhere Standard 100 is implemented, although it provides some supplemental material specific to the regions of British Columbia and Washington State.
RDH Building Science is the principal author and editor of this users' guide. It was developed with support from BC Hydro, the Province of British Columbia, and the Northwest Energy Efficiency Alliance, and in partnership with the University of British Columbia and the State of Washington Department of Commerce.
Download the user's guide
Use in Washington State
This users' guide may not fully capture or reflect Washington State amendments to Standard 100, as required by law. See Washington State’s Clean Buildings website for further details.