I'm new to the site and HVAC. I am a maintence engineer for commercial buildings but have not messed with the HVAC to much. I am starting classes in January and just recently got assigned to a high rise building where I will be doing all the prevenative maintence and some repairs on the mechanical equipment (and just about everything else at building). I am excited to learn all about HVAC and refridgeration. I was just browsing online today and came accross this forum, seems very informative and like a good group of guys. Hope I don't get to annoying with some of my questions as I have a lot to learn.