Blueman, you're right on the money about the alt.hvac forum, all those
guys do is belittle everyone else. They often say that the alt.hvac
forum is for "professionals", but then they do nothing but drop the "F"
bomb on everyone and say you're an idiot, how professional is that?
(see Paul's post above for example),

The alt.hvac forum has turned into a sandbox for these "professionals"
to throw mud at unsuspecting people posting with legit questions. They
really do the HVAC industry a disservice.