I've been on this site for a few months now and it has been great to be a part of this community. I have a "green" consulting company and I am primarily responsible for doing the energy models for LEED and EPAct. I joined this site to get a better understanding of HVAC systems. My background is in architecture but I want/need a strong foundation of HVAC knowledge. I plan on taking some of the EPA tests next month. Like I said earlier, glad to be on the site and I am always willing to talk.