There are places where a newbie or a "Non Believer" (not working in the field) will get their head handed to them with relish, and alt.hvac is the worst hive of scum and villainy I've ever seen.
99% of the responses are "Hire a Professional to come fix it for you, you can't handle it!" - even when the question was simple stuff like changing the filter.
I've gotten crap like that, and I DO work in that field. But no one guy can be expected to see it all - ask a simple question, get a huge ration of shit over it. Needless to say, I gave up on that bunch real fast.