The DeWalt HVAC Technician Certification Exam Guide Second Edition Paperback is a comprehensive resource for those looking to prepare for their HVAC certification exam. Published by Cengage Learning in 2009, this instructor guide covers a range of subjects including construction, technical industries, and teaching methods. Authored by American Contractors Educational Services and Norm Christopherson, this 272-page paperback guide offers valuable insights and information to help readers pass their certification exam with confidence.