[_nx010_]

Incompatible with American values?...

A cursory search on Google shows that in America, if you want to be an HVAC tech or a plumber, you basically have to take the same steps: get a high school diploma, then find a formal apprenticeship or a vocational program, then get licensed and get a certificate. The whole process takes years too. It's basically the same.

And as an American consumer it's not like you get a random handyman from the street to do the work, is it? You almost always go with one of these certified guys. And similar to the OP, there is a bunch of "illicit" work here too. Like my mechanic once insisted on coming to my home after hours to fix my car (easy fix), presumably so he can avoid paying shop fees.

[omaranto]

Just because it's standard procedure in America doesn't mean it can't also be against "American values".