"Acquire new knowledge whilst thinking over the old, and you may become a teacher of others. "
- Confucius (BC 551-BC 479) Chinese Philosopher
ASHRAE - The American Society of Heating, Refrigerating and Air-Conditioning Engineers advances technology to serve humanity and promote a sustainable world.
ASHRAE sets all standards in our industry. They are the group that you need to associate yourself with if you are in the HVAC industry and are looking to further your career. They offer tons and tons of information on the industry, specifications, design criteria, and just basic knowledge. You could spend endless amounts of time without being saturated. They hold the largest HVAC expo once a year called the AHR EXPO. You will benefit greatly by becoming a member and attending these shows. There you will see manufacturers showing off their newest products, meet representatives, industry experts, and have the chance to attend informative seminars.
IHACI - Institute of Heating and Air Conditioning Industries, Inc.
IHACI is a great organization that offers many things to the industry. Indoor Comfort News is a circulating newspaper that comes out weekly with product updates, distributor updates, and manufacturer updates. They also hold a local show in Southern California showcasing distributors and new products.
ASHRAE - The American Society of Heating, Refrigerating and Air-Conditioning Engineers advances technology to serve humanity and promote a sustainable world. 
IHACI - Institute of Heating and Air Conditioning Industries, Inc. 