Sir Willis Carrier
Most schools will help you with job placement. Many apartment complexes hire students even while they are in school. Good luck.
HVAC is used to Heat Ventilate & Air Condition, a structure.
http://www.ccsi.ie
It could be several things. duct system leaking meaning air is leaking from the connection points of the sheet metal that distributes the air throughout your home. Or it could be a refrigeration leak...