ASME was founded in 1880 as the American Society of Mechanical Engineers. Today ASME International is a nonprofit, educational and technical organization serving a worldwide membership. 

Machine Design gives pertinent information and links to related sites. 

The American Design Drafting Association promotes excellence in and recognition of the design/drafting profession.

Welcome to Bai Engineering.

Flomerics, the software developer of Flotherm® and Flovent®, has pioneered a different approach to numerical analysis and simulation, called "Design-Class". The Design-Class approach bridges the gap between science and industry by embedding complex analysis and optimization software deeply into the design process. The Design-Class philosophy focuses on enhancing productivity in engineering design.

Electronics Cooling offers information for engineers for thermal management in the electronics industry.

Cooling Zone is an on-line community for professionals in the thermal cooling field.

MatWeb is an online materials information resource to obtain physical, mechanical, and thermal properties of various manufactured materials.

ASHRAE, the American Society of Heating, Refrigerating and Air Conditioning Engineers is an international membership organization dedicated to the advancement of heating, ventilation, air conditioning and refrigeration.

BACnet - A Data Communication Protocol for Building Automation and Control Networks.  This is an ASHREA site.

ARI is the Air Conditioning and Refrigeration Institute which is a trade association representing manufactures.  These manufacturers are drawn to ARI for problem solving, performance standards, statistical reports, etc... 

misronet provides a database of architects, contractors, etc...  You can also purchase books, software and related entertainment.