vii The publisher would like to thank the many Goodheart-Willcox HVACR Survey Respondents for their time, expertise, and feedback. Their class and lab challenges, learning goals, and teaching aspirations helped shape this revision. The authors and publisher also wish to thank the industry and teaching professionals listed below for their valuable input into the development of Modern Refrigeration and Air Conditioning. The authors and publisher wish to express particular gratitude to the following individuals: Don Crawshaw, of Salt Lake Community College, for his detailed review of commercial refrigeration chapters. Greg Jourdan, of Wenatchee Valley College, for his detailed technical review of the electrical controls systems and energy management content. Dr. Christopher Molnar, of Porter and Chester Institute, for writing three sections and providing a detailed technical review of the thermostats chapter. Reviewers Randy F. Petit, Sr., of HVAC Excellence, for his extensive review and suggestions. Howard Weiss, of HVAC Excellence, for his detailed review of certification and industry association and general guidance. Jerry Weiss, Thomas Tebbe, Coy Gibson, Warren Lupson, William D. Brown, and Keith W. Satterthwaite for their frequent and generous contributions of guidance and wisdom. Jerry Alderman Ivy Tech Community College Indianapolis, Indiana Anthony L. Baham South Central Louisiana Technical College Morgan City, Louisiana David Blais Ivy Tech Community College Indianapolis, Indiana Terry Bradwell Midlands Technical College West Columbia, South Carolina Stevan Brasel Moraine Valley Community College Palos Hills, Illinois Michael Brock Florida Coast Career Tech/ Florida State College at Jacksonville Jacksonville, Florida William D. Brown Brownson Technical Redlands, California Mark R. Buller British Columbia Institute of Technology Burnabay, British Columbia, Canada Danny Burris Eastfi eld College of the Dallas County Community College District Mesquite, Texas Terry Carmouche South Central Louisiana Technical College Reserve, Louisiana Michael Chandlee Tennessee Technology Center at Pulaski Pulaski, Tennessee James M. Clements Southern Regional Technical College Th omasville, Georgia James Conway Lindsey-Cooper Refrigeration School Irving, Texas John Dalton Universal Air Conditioning Co. Bell Gardens, California Rick Dorssom Hillyard Technical Center St. Joseph, Missouri Patrick Duschl Fortis College Cincinnati, Ohio George Frank British Columbia Institute of Technology Burnaby, British Columbia, Canada Rod Fronk Wichita Technical Institute Topeka, Kansas David W. Fuller Clovis Community College/ Air One HVAC Sales and Service Clovis, New Mexico/Portales, New Mexico Tim Gohdes Central Texas College Killeen, Texas Brad Guthrie Front Range Community College Fort Collins, Colorado Michael Hall Lincoln Technical Institute Mahwah, New Jersey Marvin J. Hamel Locklin Technical Center Milton, Florida James H. Hanway Northland Career Center Platte City, Missouri Gary L. Harrison AG&H Contractors LLC Baton Rouge, Louisiana Samuel A. Heath Southern Technical College Brandon, Florida Patrick Heeb Long Beach City College Long Beach, California