This position is responsible for the upkeep and repair of HVAC systems in commercial and industrial settings. The worker consults with the customer to define the job's specifications, then applies established procedures to do the task. Students will go through a series of activities in the trade practical book during classroom and lab time. These activities are meant to test students' mastery of every topic on the required curriculum. The trade theory book equips the learner with the necessary theoretical knowledge. Instructors can evaluate their students' progress through the use of tests and homework. Unique among teaching aids, such wall charts and transparencies allow the trainer to both effectively deliver a topic and gauge the learner's comprehension of that topic. The teacher can organize his or her teaching timetable, raw materials needed, and daily lessons and demonstrations with the help of this guide.