National True-Test's Associates
 
National Environmental Balancing Bureau, (NEBB) Mid-South EBB, (MEBB) American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc. (ASHRAE)
BBG&S Engineering Consultants, Inc.
MW/Davis Dumas & Associates, Inc.
Giattina Aycock Architecture Studio
Whitaker & Rawson, Inc.
Environmental Systems Corporation
Sain Engineering Associates, Inc.
Brice Building Company
Robins & Morton Construction Company
Bradley Plumbing & Heating, Inc.
Capital Refrigeration Company/Comfort Systems USA
H&M Mechanical, Inc./Comfort Systems USA
Holbrook Service CO
Shook & Fletcher Mechanical Contractors, Inc.
Smith-Raymond CO, Inc.
Children's Hospital of Alabama
Cullman Regional Medical Center
Northeast Regional Medical Center
RSA (Retirement Systems of Alabama)