THIS REPORT IS A COMPILATION OF DATA ON ELECTRIC AIR CONDITIONING COSTS, OPERATIONS AND MAINTENANCE. AIR CONDITIONING UNITS ARE COMPARED IN TERMS OF ELECTRIC VERSUS NON-ELECTRIC, AUTOMATIC VERSUS OPERATED, AIR COOLED VERSUS WATER COOLED, RECIPROCATING VERSUS CENTRIFUGAL COMPRESSORS, SPACE AND NOISE, REHEAT, MAINTENANCE AND ORIGINAL COST. DATA ARE PRESENTED SHOWING COMPARATIVE ELECTRIC COSTS OF BEFORE AND AFTER AIR CONDITIONING SERVICE INSTALLATIONS AND A TABULATION OF SERVICE COSTS FOR TOTALLY AIR CONDITIONED SCHOOLS. (GM)