ACCA - Air Conditioning Contractors of America
AHRI - Directory of certified HVAC product performance
ASHRAE - American Society of Heating, Refrigerating, and Air-Conditioning Engineers
Chiller Mechanic Bulletin Board - The first bulletin board community dedicated to chiller mechanics
HVAC Industry Marketplace - A directory for HVAC manufacturers, suppliers, and contractors
HVACR-Jobs.com - The premier address for HVAC/R jobs. Operated by HVAC professionals.
North America HVAC - All HVAC parts cheaper
Service Roundtable - The largest private HVAC/R contractor group.
SMACNA - Sheet Metal and Air Conditioning Contractors' National Association
Vonigo - Simple, secure and scalable online management software specifically for multi-location service companies. Receive a free month by entering code von114.