WDF Inc. (founded in 1929) is one of the plumbing, HVAC contracting and specialty general contracting companies. They have joined with Five Star Electric Corporation and Nagelbush Mechanical to form GreenStar Services Corporation as a diversified full service construction company.

WellAware empowers organizations to be safer, more efficient, and more sustainable by streaming analytics-quality data between their people and assets, enabling remote monitoring, control, and automation of critical infrastructure.

Western Allied Mechanical has been a pioneer in the construction industry for 50+ years as a mechanical contractor that specializes in design/build for bio-tech, high tech; retrofit and replacement; LEED and Green projects; and HVAC service and maintenance.

Winsupply Inc. is a supplier of residential and commercial construction and industrial supplies and equipment headquartered in Dayton, Ohio. They conduct business-to-business wholesale distribution of supplies and equipment in plumbing and heating; hydronics; pipe, valves and fittings; HVAC and refrigeration;

Wm. W. Meyer & Sons, Inc. are renowned manufacturers of commercial and industrial vacuums for cleaning ducts, boilers, furnaces and chimneys in residential, commercial, institutional and industrial applications.

Wright Sales is a premier manufacturer's sales agency for the HVAC/R industry in California, Arizona, Nevada, New Mexico, El Paso, TX and Hawaii.

XCI Zoning was founded to provide the latest and newest technologies and ideas to provide better comfort and better control of the HVAC system. Specializing in forced air zoning, XCI has designed systems that enable HVAC systems to deliver greater comfort and reduced energy consumption.

Yandle-Witherspoon Supply, Inc. strives to offer impeccable customer service while developing long lasting relationships through business partnerships formed with the HVAC contractor. Providing quality product, a vast array of value added services, education, training, friendly employees and competitive prices allows Yandle-Witherspoon Supply, Inc. to be a major force in the HVAC industry in North and South Carolina.

Yaskawa America, Inc. - Drives & Motion Division manufactures industrial control and automation products. It offers industrial AC drives, commercial HVAC drives, spindle drives, and motors, servo systems and motion controllers, medium voltage switches, breakers, contactors, and low voltage industrial control products.

Yorkool Private Ltd is a specialist that provides advanced engineering ideas and transforming it into reality. Their key competencies are in turnkey projects, central cooling plant system retrofitting and maintenance services. They focus on crafting energy-efficient based solutions, creating cost savings and value for the customers.

Yunker Plastics, Inc. is a fabricator and distributor of reinforced HDPE, Firestone EPDM Geomembrane, and AquaWeve materials used in Lake and Pond lining installations. We also fabricate flexible air distribution tubing for commercial, industrial and agricultural applications.

Zettler Controls Inc. is a US-based renowned HVACR component manufacturer with an extensive offering of relays, thermostats, transformers, heat sequencers, temperature sensors, and fan centers.

ZONEFIRST is the first company that successfully developed and marketed HVAC Zoning Systems back in the 1950's and is today a renowned manufacturer of HVAC zone dampers and zoning systems. They provide zone control systems, automatic dampers, registers and diffusers for fresh air intake, economizers and ventilation control.