Standard 100

Standard 100-2015 -- Energy Efficiency in Existing Buildings (ANSI Approved/IES Co-sponsored)

This essential ASHRAE resource offers over 100 typical energy efficiency measures (EEMs) that can be applied to enable buildings to meet set energy targets, identifying commonly applied elements that can improve building performance.

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About Standard 100

The 2015 revision of ANSI/ASHRAE/IES Standard 100-2006 provides greater guidance and a more comprehensive approach to the retrofit of existing buildings for increased energy efficiency, and brings the standard in line with other published ASHRAE documents, specifically Standard 90.1-2013, Energy Standard for Buildings Except Low-Rise Residential Buildings, and 2011 ASHRAE Handbook—HVAC Applications.

Detailing procedures to attain target energy efficiency measures, the revised standard

seeks to achieve greater measured energy efficiency by providing comprehensive and detailed descriptions for the retrofit of existing residential and commercial buildings
addresses major and minor modifications for both residential and commercial buildings, especially in urban areas
addresses single and multiple activity buildings with variable occupancy periods (one shift, two shift, three shift) and identifies the approach for 53 building types (per CBECS and RECS) in 17 climate zones/subzones
identifies requirements for buildings with energy targets undergoing major retrofit and for buildings without energy targets and provides multiple levels of compliance
establishes the need for development of an energy management plan and an operation and maintenance program while recognizing that the actual occupancy of the building plays a key role in its performance
addresses a building's energy-use efficiency in a quantitative manner and provides a means to improve aggregate savings through efficiency with an objective benchmark

Included in the revised standard are criteria for energy use surveys and auditing and requirements related to implementation and verification. Appendices are included for life cycle cost analysis procedures as well as identification of potential energy conservation measures.

While the standard is not intended to be a rating system, such as those defined by ASHRAE or EPA, ASHRAE's Building Energy Quotient (bEQ) program is using methodology from Standard 100 to calculate a building's median/baseline EUI and to allow greater uniformity between the "In Operation" and "As Designed" ratings. Learn more

Other Available Resources

Performance Measurement Protocols for Commercial Buildings

This book provides a standardized set of protocols over a range of accuracies and costs that can be applied consistently to the assessment of building performance, in both the United States and internationally. The protocols identify what to measure, how to measure it, and how often it is to be measured for inclusion in the building's operation and maintenance plan.

Procedures for Commercial Building Energy Audits, 2nd ed.

This full-color reference defines best practices for energy survey and analysis for purchasers and providers of energy audit services. The expanded second edition provides updated guidance and tools for energy consulting engineers, LEED® professionals, real estate professionals, building owners and building managers.