Hvac wiz 79,
Believe it or not, you have an advantage. After the Navy, I have worked as a pipe fitter, tin worker, HVAC tech (residential, commercial, and industrial), plumber, electronics tech, BAS tech and designer to present. I have assisted other HVAC personnel not to cross over, but converge into BAS tech/designer. You probably already understand electronics, but now get on the computer and learn your way through the digital world. As you can tell; I like to see HVAC personnel willing to learn a new field. Contact any major controls company and find a mentor or just be willing to take on a shadow. Don't be afraid of technology; embrace it and find the opportunity to use current knowledge.