These kind of videos are rare. Field knowledge is increased only from this kind of videos because books can't provide such details. Don't worry on viewership. For specialised knowledge only selected people are interested.
Yes dear......i usually got 1k or 2k views on my videos....but all videos are site related and deep knowledge of HVAC which you can't get from any books.......
Kindly explain what are differences in HVAC maintenance in facility engg like mall, hospitals or building and HVAC maintenance in Oil and gas industries. Also explain how to switch job from facility maintenance to oil n gas maintenance.