My name is Michelle. I joined this site to educate myself about HVAC. My brother owns a HVAC company and I now work for him.

I have a BS in Civil Engineering but do not know a lot about how the Heat Load Calculations are done. I heard about the Manual J & D. I also downloaded a HVAC Calc. program that gives you the heat gain and loss answers. I am more interested and how they get those answers. What formula's are they using, etc.

I also have a lot of questions regarding high velocity systems. Why are they so touchy?????