8 year service tech here... I'm looking to get into some certification classes to learn DDC and BAS controls. I'm pretty much new to these controls besides light pneumatics. Do you guys have any advice on which classes to start with? Or maybe a chronological order of classes I should take. A local company around here is offering a job for DDC/BAS control tech starting $65k-$95k. I can get used to that. I broke my back a couple years back and have been looking into transitioning into a different area of HVAC rather than residential and commercial repairs...