I have decided to start-up my own small residential HVAC company after working with a nationwide company for over 8 years. I have owned my own company before, altho it was a restaurant not an HVAC company. Did that for 15 years and very successfully until I got burned out. I live in Boulder county, CO. To apply for a license here you are required to pass the N29 Master Mechanical exam. The exam is based on info from 3 sources including the 2008 NEC Handbook. WOW! What a monster that is..... 1500 pages. I don't want to be an electrician, just an HVAC contactor. Do I need to know everything in this huge book?? Does anyone have any ideas on this? Do I only need to study the sections that look like they apply to the HVAC industry?