| True Air Mechanical, Inc. | Corona | CA | $0 |
| Truss & Son Plumbing, Inc. | Lufkin | TX | $0 |
| TSG, LLC | La Vergne | TN | Subcontractor |
| T&t/lanco, Inc. | Reading | PA | $0 |
| Tuckey Mechanical Services Inc. | Carlisle | PA | $0 |
| Tudi Mechanical Systems, Inc. | Mc Kees Rocks | PA | Subcontractor |
| Turner Mechanical, Inc. | Beech Island | SC | Subcontractor |
| Turner Plumbing, Heating & Air Conditioning, Inc. | Columbus | GA | Subcontractor |
| Tweet-garot Mechanical, Inc. | De Pere | WI | $0 |
| Twins Plumbing LLC | Kempner | TX | Subcontractor |
| United Mechanical Contractors, Inc. | Klamath Falls | OR | $0 |
| United Mechanical (gu), LLC | Tamuning | GU | Subcontractor |
| United Mechanical Inc.Oklahoma City, OK · UEI LEPZKM5Q96T7 | Oklahoma City | OK | Subcontractor |
| United Mechanical Inc.Racine, WI · UEI V4PFURAZ9LY3 | Racine | WI | $0 |
| United States Sprinkler Inc. | Birmingham | AL | $0 |
| United Team Mechanical LLC | Kaysville | UT | Subcontractor |
| United Test & Balance, Inc. | Nordland | WA | Subcontractor |
| Universal Ac Inc. | Ewa Beach | HI | Subcontractor |
| Universal Climate Control, Inc. | Coralville | IA | Subcontractor |
| Universal Heating & Air Conditioning, Inc. | Mineola | NY | $0 |
| Universal Supply & Equipment LLC | New Orleans | LA | $0 |
| University Mechanical & Engineering Contractors, Inc. | El Cajon | CA | $0 |
| Upper Bay Mechanical, Inc. | Havre De Grace | MD | Subcontractor |
| U.S. Engineering Construction, LLC | Kansas City | MO | Subcontractor |
| U.S. Mechanical Limited Co. | Pleasant Grove | UT | $0 |
| US Sheet Metal Inc. | Saginaw | MI | $0 |
| Valdosta Mechanical Company, Inc. | Valdosta | GA | $0 |
| Valley Mechanical Contracting Inc. | Wasilla | AK | Subcontractor |
| Valor Construction And Contracting LLC | Milliken | CO | $0 |
| Vaporveneta S.R.L. | Altavilla Vicentina | | $0 |
| Varitec Controls And Service Solutions LLC | Phoenix | AZ | Subcontractor |
| Ventilation Solutions Inc. | Oak Ridge | TN | Subcontractor |
| Ventura Climate Control Company, Inc. | Santa Paula | CA | Subcontractor |
| Verne's Plumbing, Inc. | Buena Park | CA | $0 |
| Verus Test And Balance, Inc. | Mount Airy | MD | Subcontractor |
| Victoria Air Conditioning Ltd. | Victoria | TX | Subcontractor |
| Virginia Mechanical, Inc. | Tracy | CA | Subcontractor |
| Vision Air Hvac Inc. | Pueblo | CO | Subcontractor |
| Vision Mechanical, Inc. | Reading | PA | Subcontractor |
| Vmech, Inc. | Weston | FL | $0 |
| Vulcan Mechanical Services, Inc. | Hoover | AL | Subcontractor |
| Wagner-meinert, LLC | Fort Wayne | IN | $0 |
| Walker White Inc. | Columbia | SC | Subcontractor |
| Wallace-dunn Heating And Air-conditioning, Inc. | Mount Gilead | NC | $0 |
| Walter N. Yoder & Sons, Inc. | Cumberland | MD | Subcontractor |
| Walters Controls Inc. | Mobile | AL | Subcontractor |
| Walz Mechanical, Inc. | Helotes | TX | Subcontractor |
| Wardwell Piping, Inc. | Windham | ME | $0 |
| Warko Roofing Company, Inc. | Reading | PA | $0 |
| Warner Mechanical Corp. | Fremont | OH | Subcontractor |
| Warrington Building Services Inc. | Kosciusko | MS | $0 |
| W. A. Soefker & Son, Inc. | Memphis | TN | Subcontractor |
| Waters Mechanical, Inc. | Glennville | GA | Subcontractor |
| Watertree, Inc. | Rapid City | SD | Subcontractor |
| Wd Manor Mechanical Contractors Inc. | Phoenix | AZ | $0 |
| Weatherite Corporation | Walnut | CA | $0 |
| Weather Masters, Inc. | Mesa | AZ | $0 |
| Webster Energy And Building Solutions LLC | Marana | AZ | Subcontractor |
| Weidner Plumbing & Heating Co. | Saint Cloud | MN | $0 |
| Wern Air Inc. | Westminster | CO | $0 |
| West Coast Air Conditioning Company, Inc. | El Cajon | CA | Subcontractor |
| West Coast Mechanical Solutions LLC | Tumwater | WA | Subcontractor |
| Western Mechanical Inc. | Logan | UT | $0 |
| Westhampton Plumbing Inc. | W Hampton BCH | NY | $0 |
| West Mechanical Inc. | Bellingham | WA | $0 |
| West Point Fire Protection Inc. | Ramona | CA | Subcontractor |
| West Point Specialties Contracting Inc. | National City | CA | Subcontractor |
| Wheel Mechanical Contracting & Supplier Inc. | Elrama | PA | $0 |
| Wick Boiler Service, Inc. | Santa Barbara | CA | $0 |
| Wiegmann & Associates Inc. | Saint Charles | MO | Subcontractor |
| Williams Mechanical Services, Inc. | Jonesboro | AR | Subcontractor |
| Williams Plumbing, Heating & Utilities, Inc. | Belgrade | MT | $0 |
| Willis & Sons, Plumbing, Hvac, Inc. | Waverly | OH | $0 |
| Windom Fire & Safety, LLC | Windom | MN | $0 |
| Windover Everett M Inc. | Colchester | VT | $0 |
| Winger Contracting Co. | Ottumwa | IA | $0 |
| Winona Heating & Ventilating Company | Winona | MN | $0 |
| Wise Heating & Cooling Inc. | West Branch | MI | $0 |
| Wj Oneil Co. | Livonia | MI | $0 |
| W.l. Gary Company Incorporated | Washington | DC | Subcontractor |
| Wm E Walter Inc. | Flint | MI | $0 |
| Wm J Donovan Co. | Philadelphia | PA | $0 |
| Wm J. Lamar & Sons, Inc. | Greenville | RI | $0 |
| Wolff's Plumbing & Heating, Inc. | Spearfish | SD | $0 |
| Woodham Plumbing Co. Inc. | Dothan | AL | Subcontractor |
| Wooldridge Heating And Air, Inc. | Lynchburg | VA | $0 |
| World Air Conditioning | Seoul | | $0 |
| Worth & Company, Inc. | Pipersville | PA | Subcontractor |
| Ws Electrical & Air Conditioning Inc. | Decatur | AL | Subcontractor |
| Yeagle & Sons Construction, Inc. | Salt Lake City | UT | $0 |
| Ymc, Inc. | Meridian | ID | Subcontractor |
| Zion Engineering LLC | Herriman | UT | $0 |
| Zoi Contracting Inc. | Brooklyn | NY | $0 |
| Zowada Plumbing & Heating Inc. | Sheridan | WY | $0 |
| Holaday-parks-fabricators Inc. | Tukwila | WA | Subcontractor |
| F & S Mechanical And Plumbing Services, Inc. | Atlanta | GA | −$333 |
| Peterson Sheet Metal Inc. | Bemidji | MN | Subcontractor |
| Bilmin Company, Inc. | Gaithersburg | MD | −$425 |
| RDRC Mechanical Services, Inc. | Aubrey | TX | −$801 |
| Paul's Plumbing And Heating, LLC | Holdenville | OK | −$816 |
