I don't think this opinion holds a rational basis.
Extreme poverty being a factor in low job demand is an argument for coercing people into performing certain tasks even though they are not economically viable just because it benefits you personally. This is not a valid argument, neither indentured servitude or slavery. Isn't the US supposed to be a free market economy where free Enterprise reigned?
Complaining about regulation, including waste disposal, is also dumbfounding. Being required to dispose of air filters in a landfill is not the reason why you can't afford a repair. This opinion is also comical as HVAC also covers air quality because otherwise you can be cool in a room but literally sick.
This sort of opinion sounds completely irrational and unsubstantiated, and extremely ideological.
The main factors driving repair cost are things like device longevity, unit price, speed and ease of repair, parts availability, etc. That's mainly it. When you call someone to your house to repair something, the price tag covers that person's cost of living for the fraction of the time it takes them to deal with your problems. On top of that, you need to pay whatever parts they need to buy to get your things back to work. That's where the money goes.