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ASHRAE/IES publish updated energy efficiency standard

February 25, 2015 - ASHRAE and IES (Illuminating Engineering Society) have released a newly revised standard to provide “greater guidance and a more comprehensive approach to retrofit of existing buildings for increased energy efficiency.”


ANSI/ASHRAE/IES Standard 100-2015, Energy Efficiency in Existing Buildings, provides descriptions of the processes and procedures for the retrofit of existing residential and commercial buildings in order to achieve greater measured energy efficiency. Appendices are included for life-cycle cost analysis procedures as well as identification of potential energy conservation measures.

“The total primary energy used in both residential and commercial building sectors is expected by the U.S. Energy Information Administration to rise each year for the next several decades in spite of aggressive efficiency improvements in new construction,” Rick Hermans, chair of the Standard 100 committee, said. “In order to reduce the overall impact of energy used by residential and commercial buildings, the existing building stock must become more efficient. This revision to Standard 100 provides the means to accomplish that goal.”

The standard, last published in 2006, addresses both residential and commercial buildings as well as single and multiple activity buildings with variable occupancy periods and identifies the approach for 53 building types in 17 climate zones/subzones.

Recognizing that the actual occupancy of the building plays a key role in its performance, the standard establishes the need for development of an energy management plan and an operation and maintenance program. It also addresses the requirements for ongoing commissioning.

The cost of Standard 100-2015 is $72 ($61 for ASHRAE members). To order, contact ASHRAE Customer Contact Center at 1-800-527-4723 (United States and Canada) or 404-636-8400 (worldwide), fax 678-539-2129, or visit www.ashrae.org/bookstore.