ASHRAE
American Society of Heating, Refrigerating and Air conditioning Engineers
http://www.ashrae.org/
ACCA
Air Conditioning Contractors of America
http://www.acca.org/
AMCA International
Air Movement and Control Association International
http://www.amca.org
PHC
National Association of Plumbing-Heating-Cooling Contractors
http://www.phccweb.org
NHRAW
North American Heating, Refrigeration, and Air-conditioning Wholesalers Association
http://www.nhraw.org
PHCC
Plumbing, Heating Cooling contractors Association
http://www.phccweb.org/
RSES
Refrigeration Service Engineers Society
http://www.rses.org/
SMACNA
Sheet Metal and Air Conditioning Contractors National Association
http://www.smacna.org/
NACHI
National Association of Certified Home Inspectors
http://www.nachi.org/bbsystem/viewtopic.php?t=3692
AHR EXPO
International Air Conditioning, Heating, Refrigerating Exposition
http://www.ahrexpo.com/
Cool Careers, Hot Jobs in the HVACR Industry
http://www.coolcareers.org
HVACR and Plumbing Career Guide
http://www.khake.com/page23.html
MEP at Work
HVACR, Electrical, and Plumbing Careers and Resources
http://www.mepatwork.com/
U.S. Department of Labor Bureau of Labor Statistics
http://www.bls.gov/oco/ocos192.htm
Construction Contractors Board
(503) 378-4621
Oregon Licenses, Permits, and Registrations
http://licenseinfo.oregon.gov/index.cfm?fuseaction=welcome_keyword
NATE
North American Technician Excellence
http://www.natex.org/
National Contractors.com
http://www.nationalcontractors.com/licensing.htm