| S.r. Mechanical, Inc. | Salina | UT | $0 |
| SRS Enterprises, Inc. | Brooklyn | NY | $0 |
| Ssi Contracting Inc. | Forrest City | AR | $0 |
| S & S Mechanical LLC | Sparks | NV | Subcontractor |
| S&S Plumbing Repair L.L.C. | Saint Joseph | MO | $0 |
| Stack Bros. Mechanical Contractors, Inc. | Superior | WI | $0 |
| Standard Heating & Air Conditioning, Inc. | La Vista | NE | Subcontractor |
| Standard Sheetmetal & Mechanical Inc. | Honolulu | HI | Subcontractor |
| Stanger Industries Inc. | Kansas City | MO | Subcontractor |
| Stan's Heating Inc. | Ontario | OR | $0 |
| Star Service, Inc. | Billings | MT | $0 |
| Star Service Inc. Of Jackson | Florence | MS | $0 |
| Statewide Mechanical, Inc. | Townsend | DE | Subcontractor |
| Stay Safe Construction And Transport, Inc. | Cameron Park | CA | $0 |
| St Cloud Refrigeration Inc. | Saint Cloud | MN | $0 |
| Steam Solutions Inc. | Ferris | TX | $0 |
| Steve C Boneso Construction Inc. | Santa Margarita | CA | Subcontractor |
| Stewart Mechanical Solutions LLC | Phoenix | AZ | Subcontractor |
| Stirrett-johnsen, Inc. | Silverdale | WA | Subcontractor |
| Stout & Associates, Inc. | North Highlands | CA | $0 |
| Strampello Plumbing Inc. | Midway City | CA | Subcontractor |
| Streimer Sheet Metal Works Inc. | Portland | OR | Subcontractor |
| Summit Heating & Air Conditioning LLC | Townsend | DE | $0 |
| Summit Heating And Cooling, LLC | Kansas City | MO | Subcontractor |
| Summit Plumbing Co. LLC | Gardnerville | NV | Subcontractor |
| Sun Mechanical Contracting, Inc. | Tucson | AZ | Subcontractor |
| Superhero Fire Protection, LLC | Lawrenceville | GA | Subcontractor |
| Superior Mechanical Services Inc. | Dayton | OH | $0 |
| Superior Mechanical Services, Inc. | Beltsville | MD | $0 |
| Superior Mechanical Systems, Inc. | Pinellas Park | FL | Subcontractor |
| Superior Piping, Fabricators & Erectors, Inc. | Stanfield | NC | Subcontractor |
| Superior Plumbing Service LLC | Ewa Beach | HI | Subcontractor |
| Sure Marine Service Inc. | Seattle | WA | $0 |
| Swick Plumbing & Heating Inc. | Marquette | MI | $0 |
| Sylvester & Cockrum Inc. | Winston Salem | NC | Subcontractor |
| System Service & Engineering, LLC | Lynn Haven | FL | Subcontractor |
| Systems Management & Balancing Inc. | Waukee | IA | Subcontractor |
| Tab Services, Inc. | Norcross | GA | Subcontractor |
| Tab Technologies LLC | Austin | TX | Subcontractor |
| Tarpon Dock Metal Craft, Inc. | Panama City | FL | Subcontractor |
| Tate Engineering Systems Inc.New Holland, PA · UEI MXXXKUE14LE6 | New Holland | PA | $0 |
| Tate Engineering Systems Inc.Chesapeake, VA · UEI U2KFBEZEFNX1 | Chesapeake | VA | $0 |
| Taylor Construction Services Heating & Air Conditioning, Inc. | North Chesterfield | VA | $0 |
| T.c. Edwards, LLC | Wheatland | WY | $0 |
| Tc Mechanical LLC | Riverton | UT | Subcontractor |
| Team Cci LLC | Maumee | OH | $0 |
| Technical Building Services, Inc. | Tucson | AZ | $0 |
| Tech Plan Inc. | Plano | TX | Subcontractor |
| Tedeschi Fire Protection Inc. | San Luis Obispo | CA | Subcontractor |
| Tekon-technical Consultants Inc. | Portsmouth | NH | Subcontractor |
| Temp Air Co. | Owings Mills | MD | Subcontractor |
| Tempaire International Inc. | Charlotte Amalie | VI | $0 |
| Temprite Mechanical, Inc. | Laredo | TX | Subcontractor |
| Terrell Brothers, Inc. | Glennville | GA | $0 |
| Test & Balancing Inc. | Halethorpe | MD | Subcontractor |
| Testing Specialties, Incorporated | Chesapeake | VA | Subcontractor |
| Texas Refrigeration Inc. | Fort Worth | TX | $0 |
| T.F.R Inc. | Leesburg | FL | Subcontractor |
| The Burdick Plumbing & Heating Co. | Decatur | IL | $0 |
| The Butte Tin Shop, Inc. | Butte | MT | $0 |
| The Machado Environmental Corp. | Glendale | CA | $0 |
| The Morin Company, LLC | Columbia | MD | Subcontractor |
| The Payne Company | Shreveport | LA | $0 |
| The Plumber Contracting Inc. | Clarksville | AR | $0 |
| The Poole And Kent Corporation | Halethorpe | MD | $0 |
| The Riverview Group, Inc. | Owings | MD | Subcontractor |
| Thermacon Service Co. Inc. | Beaumont | TX | $0 |
| Thermal Concepts Inc. | Chino | CA | $0 |
| Thermal Concepts LLC | Davie | FL | Subcontractor |
| Thermal Exchange LLC, The | Cathedral City | CA | $0 |
| Thermaltran Mechanical Inc. | Wilmington | NC | $0 |
| The Standard Plumbing & Heating Company LLC | Canton | OH | $0 |
| The Waldinger Corporation | Fenton | MO | Subcontractor |
| The Walters Co. Airconditioning, Inc. | Albany | NY | Subcontractor |
| Thomas J Dyer Co. | Cincinnati | OH | Subcontractor |
| Thornton Heating & Sheetmetal, Inc. | Ketchum | ID | $0 |
| Tica Inc. | Decatur | IL | $0 |
| Tieffe S.R.L. | Camisano Vicentino | VIR | $0 |
| Timberlake & Dickson, Inc. | Garland | TX | Subcontractor |
| T. J. Conway Co. | Springfield | MA | $0 |
| Told Plumbing, L.L.C | Pleasant GRV | UT | Subcontractor |
| Tom Stevens Boiler Repair, LLC | Damascus | OR | Subcontractor |
| Tonets CorporationChuo-ku · UEI MPG1M76XGCM5 | Chuo-ku | | $0 |
| Tonets CorporationOsaka, OSAKA · UEI PKNAKWVSVX62 | Osaka | OSAKA | $0 |
| Total Energy Management & H.v.a.c. Services, Inc. | Richland | WA | Subcontractor |
| Total Fire Protection, Inc. | Grand Rapids | MI | Subcontractor |
| Total Group, LLC | Nashville | TN | $0 |
| Total Mechanical Inc. | Sunland Park | NM | $0 |
| Town And Country Plumbing And Trenching, LLC | Chillicothe | MO | $0 |
| Town & Country Plumbing, Inc. | Burns | WY | $0 |
| Tradesmen Of New England, L.L.C | Bloomfield | CT | $0 |
| Traina Mechanical Inc. | Metairie | LA | $0 |
| Transbay Fire Protection, Inc. | Pleasanton | CA | $0 |
| Treasure Fire Equipment Inc. | Ogden | UT | $0 |
| Tri-county Mechanical And Electrical, LLC | Helena | MT | $0 |
| Triple A Fire Protection, Inc. | Semmes | AL | $0 |
| Triple S Plumbing, Inc. | Keystone Heights | FL | $0 |
| Tritle Plumbing, Inc. | Alliance | NE | $0 |
| TRM Services, Inc. | Spokane Valley | WA | Subcontractor |
| Trombly Plumbing & Heating, LLC | Saint Johnsbury | VT | $0 |
