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JAMES’s Answer
Both my Dad and my Brother work in the commercial HVAC industry for large buildings, and I worked in that industry for a short time as well. If you like getting out and seeing different places, and working on large equipment, then it can be a fun job. It is technical for sure, but once you get good training and know what you're doing, it can be a very rewarding job.
Check out a trade school
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Updated
Steve’s Answer
i worked as a mechanical hvac engineer using AutoCAD to design the ductwork system in residential and commercial buildings. most of our work was in a consulting manner, however i also had friends who did the installation. from what i understand, the actual situation is usually not exactly how things were designed. when an installer gets onsite, they may need to figure out small workarounds such as an elbow piece not fitting exactly as designed, etc... so to answer the question, hvac can have its unforeseen challenges, and additionally on a daily basis.