188 Questions and answers in the HVAC Field for Beginners for Interview purposes, the basic definitions in this field, as well as the duct works questions, and some design questions. it is written in a very simple English language (PDF format) that can anyone understand. It will open new gates for beginners to open and search for new subjects in this field. also, the Engineers will be familiar with the units and standards that are used in this field. The course will cover the different main machines that are used in HVAC like AHU, FCU, and chillers. Also, the engineers will know the types of air conditioning systems that are widely used. As we said, plus the HVAC units the Engineer will learn about the unit conversions. The file of the course includes some illustrated answers. also, the Engineer will know about Refrigeration and air conditioning systems, sustainable buildings, energy efficiency concerns, and energy recovery equipment. The engineer also learned about the types of dampers. from the subjects also is the VAV dedicated ventilation systems. I can also say there are some questions about Dew point control which require measuring humidity and temperature. add to the previously dedicated outdoor air systems.