Energy efficiency guide for existing commercial buildings lead author: Dennis R. Landsberg (L & S Energy Services Inc.) ; developers: American Society of Heating Refrigerating and Air Conditioning Engineers Inc. The American Institute of Architects Illuminating Engineering Society of North America U.S. Green Building Council U.S. Department of Energy ; 2: Technical implementation This guide explains why building owners and managers should be concerned about energy efficiency. The second in a series the goal of this resource is to help the audience evaluate current building operations and also provides technical guidance on how to achieve energy efficiency in these buildings Provided by publisher