The Air Conditioning, Heating & Refrigeration (HVAC) Mechanic Passbook(R) prepares you for your test by allowing you to take practice exams in the subjects you need to study. It provides hundreds of questions and answers in the areas that will likely be covered on your upcoming exam, including but not limited to: principles and practices of air conditioning and refrigeration; principles and practices of heating and ventilation systems; inspection, operation, maintenance and repair of basic mechanical equipment; reading and interpretation of plans and specifications; and more.