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In addition, Preston's CD-ROM also features our Seasonal Energy-Cost Comparator allowing you to make a quick comparison of the estimated energy costs of the customer's old equipment vs. those of your proposed replacement unit. Print these out to include with your presentation to the customer... Preston's CD-ROM is a stand-alone database that runs on all versions of Windows and Macintosh Operating Systems. The CD-ROM software includes a license agreement allowing you to make a copy of it on to a single pc's hard drive. Multiple copies are discount priced to accommodate needing it on multiple computers. It may also be run on a server but is limited to one user at a time.$175... This huge volume weighs just under four pounds and its 928 pp, 8-1/4" x 10-3/4", perfect-bound, twin-volume (two books in one cover) includes brand cross-references and lists the maker, type of equipment, model numbers, year(s) of manufacture, and the original factory specs on capacity and efficiency ratings.$95