I am new to the HVAC world. The most knowledge I have is what I learned in the process of purchasing a new system for my own home. I recently got offered a position in HVAC sales with a local small business. I am interested in your recommendations for a book to help me learn the basics, and not so much the technical aspects, of HVAC. Some technical stuff is fine but I will never be installing or troubleshooting beyond just speculation. I'm picking up Modern Refrigeration and A/C today to check out. Is there anything else you would recommend?