Flat patterns, yes. I've never seen SW do pipe bends (im interested if it does, I have some projects that could use improvement in routing)Unfold it like make it flat for cutting and bending or layout of tubing runs?
Personally I think SOLIDWORKS does a good job of making shapes flat for fabrication.
You can pick an HVAC design package that fits your budget and needs (this is what the fab shops I deal with that don't use SOLIDWORKS do).
Flat patterns, yes. I've never seen SW do pipe bends (im interested if it does, I have some projects that could use improvement in routing)