Those trades are good if you’re 18 or 20 but impossible if you’re older ... I know HVAC better than 99% of the people in the business (I have a mobile a/c cert) but if you do the comm college course and get the ticket the HVAC companies want you cutting your fingers bending sheetmetal for $8/hr (same as their unskilled mexican help) for at least 2 to 3 years before you get a truck of your own.. just can’t do it later in life when you have responsibilities.
In the south, if you can define superheat and sub cooling and how to adjust each, you can have a truck come summer. (residential hvac) knock on doors in March, show vocational training, pass drug test, and work cheap to start, you can find work.
I took and passed state hvac contrtactors license test and passed, folks call me at night to come to see them for work.