ASHRAE
American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) is an international membership organization founded to advance the arts and sciences of heating, ventilation, air conditioning, refrigeration and related issues.

http://www.ashrae.org/

Association of Energy Engineers
AEE is your gateway for information on energy management, energy services, deregulation, power quality, plant engineering, environment, hvac, lighting, utility, electricity, oil, gas, geothermal, power, dsm, rebates, cogeneration and facility management.

http://www.aeecenter.org/

Melink
Melink Corporation is a pioneer and leader in select HVAC products and services.

http://www.melinkcorp.com/

Notifact
Celluar Monitoring

http://www.notifact.com

Wrightsoft
Wrightsoft makes HVAC Software for residential or commercial heating ventilating and cooling design use. Professional Contractors' secrets and techniques applied to any home construction design project. ACCA certified.

http://www.wrightsoft.com/