This manual prepares HVAC-R technicians with the knowledge needed to respond professionally to current and future environmental challenges. It begins with discussion of HVAC fundamentals and core topics, such as: refrigerant chemistry, oils, ozone depletion, global warming, and the Montreal protocol. Subsequent sections, each conveniently organized around a specific certification type, allow readers to delve into specific technical information, regulations, and procedures pertaining to small appliances; recovery, recycling, and reclaim; and chillers. Relevant forms, logs, and reports, plus a comprehensive glossary, are also included in handy appendices. In a field where technology change is the norm, and regulations are increasingly requiring HVAC-R technicians to adopt new procedures in order to contend with environmental problems, this manual serves as both an effective test preparation guide and an indispensable professional field reference.