Sealed but been in storage. Shipped the next business day! We own a small family book store and sell our extra media that have been on our shelfs for too long. Additional Details ------------------------------ Product description: Refrigeration and Air Conditioning Technology, 4E covers the fundamentals and practical applications for understanding and maintaining all heating and cooling systems. The comprehensive coverage of the basic theory, latest terminology, diagnostic methods, and repair procedures, combine to make this the most complete HVAC-R book available today. Advances in technology, procedures, and equipment are addressed throughout this new edition, with an increased emphasis on digital electronic controls and system efficiency. Certification and safety coverage are also expanded upon in this new edition. ALSO AVAILABLE Lab Manual, ISBN: 0-7668-0668-5 INSTRUCTOR SUPPLEMENTS Instructor's Guide, ISBN: 0-7668-0669-3 Computerized Test Bank, ISBN: 0-7668-0671-5 Format: import