![]() The cumulative and methodical progress of Standard 90.1 has taken building design out of the era when no code requirements were placed on energy usage, and important building characteristics such as the inclusion of wall insulation were left up to the individual motivations of the design and construction teams. ASHRAE 90.1-2019 is published as the most recent version, but has not been analyzed as part of the research mentioned or extensively adopted. Successive versions of Standard 90.1, up to ASRHAE 90.1-2016, have reduced the energy consumed by a typical building designed to the standard by over 50% according to research done by Pacific Northwest National Laboratory. This split solidified Standard 90.1 as ASHRAE’s answer to how to regulate and evaluate energy efficiency in commercial buildings. Later, as part of the 1989 edition, ASHRAE 90 split into ASHRAE Standard 90.1: Energy Standard for Buildings Except Low-Rise Residential Buildings and ASHRAE 90.2: Energy-Efficient Design of Low-Rise Residential Buildings. ![]() ![]() In 1975, ASHRAE 90-75: Energy Conservation in New Building Design was published as the first national energy code.
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