Abstract
In 2009, Preservation staff at the Library of Congress (LoC), working in collaboration with consultants from the Image Permanence Institute (IPI) and Herzog Wheeler Associates (H/W), proposed an experiment to determine whether a programmed nightly shutdown of all HVAC operations within a targeted collection area could achieve significant energy savings without posing unacceptable risk to the long term stability and usefulness of the volumes stored in these stacks. This article will briefly present the reasons for proposing this trial and selecting its location, steps taken to prepare for the shutdown test, results from two years of nightly shutdowns, and lessons learned.
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