Retaining coverage from the original text while updating the information in electronic form, this revised second edition presents the technical basis for designing the lighting and mechanical systems of buildings. This edition offers a full chapter on economic analysis and optimization, new heating and cooling load procedures and databases, simplified procedures for ground coupled heat transfer calculations, and numerous homework problems. The CD-ROM contains an updated version of the Heating and Cooling of Buildings software program as well as electronic appendices that include over 1,000 tables in HTML format. A solutions manual is available upon qualifying course adoption.