This pamphlet offers a preview of information services available from Solcost, a research and development project. The first section explains that Solcost calculates system and costs performance for solar heated and cooled new and retrofit constructions, such as residential buildings and single zone commercial buildings. For a typical analysis, Solcost calculates the portion of load supplied by solar, the optimum size for the collector, and the payback period for the solar system investment compared to a conventional system. An example is given of an analysis for a residence. Titles and sources of Solcost handbooks are listed. The second section introduces the operational and technical details for those familiar with solar system engineering and computer technologies. (Author/MLF)