The fourth edition of "Refrigeration and Air Conditioning,"ARI'scompletely revised, full-color, textbook, is now in print. The textbook is one of the standard references for heating, ventilation, air conditioning and refrigeration education training programs. "This new edition of Refrigeration and Air Conditioning is ideal for anyone interested in basic refrigeration, commercial refrigeration, residential air conditioning, commercial air conditioning, warm air heating, hydronic heating, HVAC control systems, and servicing HVAC systems," said Ray Mach, ARI's director of education. For ordering information contact Ray Mach at 703-524-8800 or Ray Machor order directly from Prentice-Hall by calling 800-282-0693 (for schools, call 800-922-0579), or visit www.prenhall.com. For all orders, please use the reference number ISBN# 0-13-092571-3.