DON'T DO IT
i live here in Los Angeles.
it takes 5 years experience to even be considered for employment in most jobs.
the good jobs require commercial experience on chillers and boilers, and the union holds a monopoly on training to get into that area.
(you can't get the experience you need in trade school)
i've already seen a few young guys get hired into the union only to be let go within a few months.
the residential companies are all turning over to sales which means they pay minimum wage plus a little commision.