The HVAC industry in the states normally pays very good but I had no experience other than my skills that I knew prior to that crummy job. This place I worked for did it all. Heating, Ventalation & Air Conditioning HVAC. The majority of the work was the government subsidized housing that needed heater repairs.
This guy was doing a service to the community and we did a lot of hack jobs that I was not happy about and did not like doing the work that I thought some one could end up getting hurt from.
Example we had many jobs where we were in Oakland CA pulling old floor units out and replacing them. Many times we had to cut the floor and pull them out and then rebrace the heater frame to put the new one in. The tools and materials to do the work was sub par and or not available to get the job done right. Any way I don't want to talk to much about it really. It was a bad experiance thru and thru. If I had been given a chance at a better company I quite possibly would be doing that still to this day. That was almost 10 years ago now.
That company did floor units, Wall units, Central Air and Stand alone Radiator style heaters if that helps you understand a little more.
The Central Air units we did would have the ductwork run either under the sub flooring or up in the attic. I always hated messing w/the slinky vinal/plastic duct in a box crap that had to be glued together to make longer duct runs than what one box would cover. Just crawling under houses was almost impossible at times. Keep in mind I was 6 ft 4 in at the time so this was not easy task for me. I have always been on the slim side so my thickness was not the issue. getting in, around and back out of the holes was always a big problem for me and the dust was not healthy either. Keep in mind some of the houses we worked on were very old, had real Timbers that were actually thicker than 2x4's "rough cuts w/tons of splinters" and plaster paris not sheet rock. So I did not enjoy breathing dust that could contain Asbestos
Not to mention the guy was too cheap to supply us w/all the proper tools even cheap dust masks for old houses like that. Any way it is what it is I guess.