| Falasca Mechanical, Inc. | Vineland | NJ | Subcontractor |
| Farmer & Irwin LLC | Riviera Beach | FL | Subcontractor |
| Farmington Heating & Metal Co. | Farmington | NM | $0 |
| Federal Fire Protection Corporation | Davidsonville | MD | $0 |
| F.e. Moran, Inc. Special Hazard Systems | Northbrook | IL | Subcontractor |
| Ferguson - Veresh, Inc. | Wichita Falls | TX | Subcontractor |
| Filtech-woodland, Inc. | Decatur | AL | $0 |
| Fire Engineering Co. Inc. | Salt Lake City | UT | Subcontractor |
| Fire Foe Corp. | Girard | OH | $0 |
| Fire Guys Leasing Inc. | Helena | MT | $0 |
| Fireline Sprinkler LLC | Appleton | WI | Subcontractor |
| Fire Protection Products, Inc. | Cumberland | MD | $0 |
| Fire Rated LLC | Terryville | CT | Subcontractor |
| Fire Safety, Inc. | Clearwater | FL | Subcontractor |
| Fire Sprinkler Service LLC | Eden | NC | Subcontractor |
| Fire Systems, Inc. | Smyrna | GA | Subcontractor |
| Firetrol Protection Systems, Inc.Schertz, TX · UEI NAKWC8BC18K6 | Schertz | TX | Subcontractor |
| Firetrol Protection Systems, Inc.Dallas, TX · UEI NF1GHDRANY29 | Dallas | TX | Subcontractor |
| Firetrol Protection Systems, Inc.Tempe, AZ · UEI CDX7BFJWBUC8 | Tempe | AZ | $0 |
| Firetrol Protection Systems, Inc.Lubbock, TX · UEI DM21NBC91FW8 | Lubbock | TX | $0 |
| Firetrol Protection Systems, Inc.Nederland, TX · UEI EL49HRCVPX46 | Nederland | TX | $0 |
| Firetrol Protection Systems, Inc.Tucson, AZ · UEI HZWLFN5273F4 | Tucson | AZ | $0 |
| Firetrol Protection Systems, Inc.Broken Arrow, OK · UEI KLXEG7FLFK23 | Broken Arrow | OK | $0 |
| First Choice Mechanical Maintenance Limited Liability Company | Hillsborough | NJ | $0 |
| Five Star Fire Protection, Inc. | La Habra | CA | $0 |
| Flow-pro, LLC | Augusta | GA | Subcontractor |
| Fluid Dynamics Inc. | Fort Wayne | IN | $0 |
| F.m. Sheet Metal, Inc. | Springfield | OR | Subcontractor |
| Foco Inc. | Bay City | MI | $0 |
| Fortney Refrigeration Co. | Grand Junction | CO | $0 |
| Foust Heating & Air Conditioning Inc. | Eastover | NC | $0 |
| Fowler & Sons, Inc. | Raleigh | NC | $0 |
| Fpi Mechanical, Inc. | Cohoes | NY | $0 |
| Frank M. Booth, Inc. | Marysville | CA | Subcontractor |
| Fred Cadrain & Associates, LLC | Farmington | NM | $0 |
| Freedom Air Balance, Inc. | Bigfork | MT | Subcontractor |
| Freedom Fire Pro, LLC | Rogers | AR | $0 |
| French & Company, Inc. | Jacksonville | FL | $0 |
| Fresh Air Concepts LLC | Linthicum Heights | MD | $0 |
| Frey & Campbell, Inc. | Hammondsport | NY | Subcontractor |
| Frey Lutz, LLC | Lancaster | PA | Subcontractor |
| Frost & Keeling Assoc., Inc. | Boerne | TX | Subcontractor |
| Fry Plumbing & Heating Corp. | Washington | DC | $0 |
| Fujikawa Associates, Inc. | Aiea | HI | Subcontractor |
| Fulkerson Plumbing & Heating Co. Inc. | Roswell | NM | Subcontractor |
| Funk And Company | El Paso | TX | Subcontractor |
| Fusion Boiler Works, Inc. | Omaha | NE | $0 |
| Futures Mechanical, LLC | Albuquerque | NM | Subcontractor |
| Gallo Mechanical LLC | New Orleans | LA | Subcontractor |
| Garrett Plumbing, Heating & Air Conditioning, LLC | Greenwood | AR | $0 |
| Gary's Plumbing & Heating | Laramie | WY | $0 |
| Gateway Air Conditioning And Sheet Metal Co. Inc. | El Paso | TX | Subcontractor |
| GDS Mechanical Inc. | Morris Plains | NJ | $0 |
| Gem Mechanical Services Inc. | Aston | PA | $0 |
| General Hydronics Plumbing, LLC | Alamogordo | NM | $0 |
| General Mechanical & Plumbing Services Inc. | Aguadilla | PR | $0 |
| General Sheet Metal Works, Inc. | Clackamas | OR | Subcontractor |
| General Temperature Control Inc. | Canal Winchester | OH | $0 |
| Generoso P Unsay | Dededo | GU | Subcontractor |
| Georgia Balance Company, Inc. | Moreland | GA | Subcontractor |
| Geothermal Solutions LLC | Lawrenceburg | TN | Subcontractor |
| Ghac Inc. | Ashland | KY | $0 |
| G. Hoffmann GMBH & Co. Kg | Weiden | | $0 |
| Gibson Services Co. | Terre Haute | IN | $0 |
| Giese Sheet Metal Co. Inc. | Dubuque | IA | $0 |
| Gilbert Mechanical Contractors, LLC | Minneapolis | MN | Subcontractor |
| Gill Services, Inc. | Warwick | RI | $0 |
| Gill's Heating & Cooling, Inc. | Great Falls | MT | $0 |
| Gimbel's Mechanical Solutions LLC | Waldorf | MD | $0 |
| Glassman Corporation | Hays | KS | $0 |
| GMP Piping Inc. | Ayer | MA | Subcontractor |
| Golden State Heating And Air Inc. | Chula Vista | CA | Subcontractor |
| Gold Mechanical Inc. | Springfield | MO | Subcontractor |
| Gold Mech, Inc. | Augusta | GA | Subcontractor |
| Gootee Construction, Inc. | Metairie | LA | $0 |
| G & P Service Contractors, Inc. | Wilmington | MA | $0 |
| G.r.a.c.e.s. Grandville Refrigeration, Air Condition, Electrical Services, Incorporated | Pago Pago | AS | Subcontractor |
| Grand Mesa Mechanical, Inc. | Grand JCT | CO | $0 |
| Grant Mechanical Inc. | Nampa | ID | Subcontractor |
| Gray Plumbing Inc. | Fairfield | CA | Subcontractor |
| Greiner Brothers Inc. | Indianapolis | IN | Subcontractor |
| Grimes Service Company | Grand Junction | CO | $0 |
| Gross Mechanical Inc. | Saint Louis | MO | Subcontractor |
| Gt Industrial, Inc. | Augusta | GA | $0 |
| Guardian Fire Protection Company, Inc. | Gilbert | AZ | $0 |
| Guaynabo Refrigeration Services PSC | Guaynabo | PR | $0 |
| Guest Plumbing & Heating | Chamberlain | SD | $0 |
| Gundlach Sheet Metal Works, Inc. | Sandusky | OH | $0 |
| Gunning Inc. | Cranberry Township | PA | Subcontractor |
| Guy's Mechanical Systems, Inc. | Rochester | PA | Subcontractor |
| G.w. Wagner Plumbing, LLC | E Providence | RI | $0 |
| Haber & Sons Plumbing, Inc. | Miami | FL | $0 |
| Haire Plumbing & Mechanical Co. Inc. | Fayetteville | NC | Subcontractor |
| Hall Sheetmetal Works, Inc. | Middleton | MA | Subcontractor |
| Hammerquist, Inc. | Corvallis | OR | $0 |
| Hancock Refrigeration Company, Inc. | Leonardtown | MD | Subcontractor |
| Hancock & Son Plumbing LLC | Salisbury | MD | Subcontractor |
| Harco Sales And Service, LLC | Riesel | TX | $0 |
| Harder Mechanical Contractors Inc. | Portland | OR | $0 |
| Harper Federal Construction LLC | San Diego | CA | Subcontractor |
