</font><font color="blue" class="small">( There are guys in the industry that have forgotten more than I can ever learn )</font>
That would be my old man /forums/images/graemlins/smile.gif.
When he started his business up I remember I was a little kid, but he attended a lot of courses in VA or WVA to learn how to calculate everything to do with the HVAC industry. I wish I had picked it up, be he kept me busy fabricating and installing, mostly commercial/industrial stuff, but he would do a house now and then. The last house he did was a million dollar home on the lake with 6 zones and 5 units.
He would never upgrade his style of doing things and would walk around the home with his two slides and notebook until the day he retired. That is, if the job wasn't engineered, but even then he would say, if I'm responsible for balancing this system, we need to make some changes.