Hm, good info, thank you, I'll think on it. I could probably do it tech-wise, and I appreciate the tool specsl :) My thing is usually if you get install guys involved on any of it, they don't like to do just the part you want done, they want to do it all the way they always do it, and they don't understand all the other factors that are involved in why it is the way it is. They don't care about the whole design, and how things fit in, and rarely want to understand, just steamroll over you "This is how we do it!!" Yeah, well, I am not a fan of the results you get when you do it that way.... Could be I'm just an alien :) And I haven't done anything more than chat with any of the local HVAC guys, but what I heard didn't give me the feeling "yes! This is who I want to work with!" the feeling I got was "this is how we do it, because this is how we do it, no other input wanted."