Addenda revising the hvac section of ANSI/SHRAE/IESNA Standard 90.1-1999, “Energy Standard for Buildings Except Low-Rise Residential Buildings,” have been approved for publication.

In total, 16 addenda, which consist mainly of minor editorial changes, were approved for publication. The standard is being revised through the continuous maintenance procedure.

“The project committee hopes to publish a revised standard later this year with the next published version completed in 2004,” said Lawrence Spielvogel, chair of the committee, said.

Among the addenda impacting the hvac section is an addendum that relates to the International Organization for Standardization (ISO) procedures. Addendum u changes Table 6.2.1B by adding the heat pump minimum efficiency requirements using the ISO procedure that is equivalent to the current requirements.

The approval for publication is subject to a 15-day appeal period. The addenda will be published on ASHRAE Online in the spring.

Many proposed addenda result from continuous maintenance proposals made by individuals outsides ASHRAE, according to Spielvogel. Anyone can make proposals, which must be considered by the committee. Instructions for submitting proposals can be found at

The standard, which provides the minimum requirements for the design of energy efficient buildings, reflects the many advances in design and technology since it previously was published 10 years ago.