FIND A UNION CONTRACTOR IN YOUR AREA
All of the below companies are associated with our union. If you are not listed here and you would like to be, contact us today.
| Company Name | Phone | website | Type of Work | Region |
|---|---|---|---|---|
| Absolute Comfort Systems/Rogers Comfort Systems | (314) 280-7865 | http://absolutecomfortsystems.net | Residential HVAC Service, Residential HVAC | St. Louis |
| Advanced Metal Solutions (SWMO) | (573) 590-2369 | https://advancedmetalsolutionsllc.godaddy | Welding, Custom Metal Fab, Industrial HVAC Service, Industrial HVAC | Southwest MO |
| Advanced Metal Solutions LLC | (573) 533-0397 | CAD, Commercial HVAC, Custom Metal Fab, Full Mechanical, HVAC Service, Welding | Central MO | |
| Albert Arno Inc. | (314) 383-2700 | http://www.albertarno.com/ | Air/Water System Balancing, Commercial HVAC, Custom Metal Fab, Full Mechanical, HVAC Service, Industrial HVAC, Light Commercial HVAC | St. Louis |
| Alferman Air LLC | (636) 239-9595 | http://www.facebook.com/alfermanair/ | Residential HVAC Service, Residential HVAC, Light Commercial HVAC, Light Commercial HVAC Service | St. Louis |
| Architectural Sheet Metal Systems | (314) 645-0093 | http://www.architecturalstl.com | Copper Work, Welding, Custom Ornamental | St. Louis |
| Associated Sheet Metal, Inc. | (573) 243-8455 | Commercial HVAC, Commercial Kitchens, Industrial HVAC, Light Commercial HVAC | St. Louis | |
| Berkel Sheet Metal Co. | (314) 402-9502 | http://www.berkelsheetmetal.com/ | Copper Work, Custom Metal Fab, Custom Ornamental, Residential Metals | St. Louis |
| Bieg Plumbing Company LLC | (314) 487-4564 | Residential HVAC Service, Fire Life Safety, Commercial HVAC, Residential HVAC, Industrial HVAC Service, Industrial HVAC | St. Louis | |
| BIM Designs, Inc. | (415) 963-9693 | https://www.bimdesigns.net/ | BIM, CAD | St. Louis |
| Blakely Sheet Metal, LLC | (636) 937-7500 | http://www.blakelysheetmetal.com | Commercial Roofing, Commercial Wall Panels, Copper Work, Custom Metal Fab, Custom Ornamental, x.Woman Owned Business (WBE) | St. Louis |
| C & R Mechanical Company | (314) 739-1800 | http://www.crmechanical.com | HVAC Service, Commercial HVAC, Custom Metal Fab, Full Mechanical | St. Louis |
| C-Los Industries LLC | (702) 868-8201 | http://closind.com | x.Minority Owned Business (MBE), Commercial HVAC, Custom Metal Fab, x.Small Disadvantaged Business (SDB), BIM, CAD | St. Louis |
| C&S HVAC LLC | (636) 327-4238 | www.fischermechanical.com | Commercial HVAC, HVAC Service, Light Commercial HVAC, Residential HVAC, Residential HVAC for New Home Construction, x.Woman Owned Business (WBE) | St. Louis |
| Campbell Sheet Metal | (501) 372-4761 | Commercial Kitchens, Commercial HVAC, Custom Metal Fab | Arkansas | |
| Charles E. Jarrell Contracting Co., Inc. | (314) 291-0100 | http://www.jarrellcontracting.com/ | Air/Water System Balancing, HVAC Service, Residential HVAC Service, Commercial HVAC, Residential HVAC, Residential HVAC for New Home Construction, Full Mechanical, Light Commercial HVAC, Light Commercial HVAC Service | St. Louis |
| Clay Piping Systems, Inc. | (314) 824-0660 | http://www.clayps.com | Air/Water System Balancing, HVAC Service, x.Minority Owned Business (MBE), Commercial HVAC, Full Mechanical | St. Louis |
| Climate Masters, Inc. | (314) 968-8383 | http://www.climatemasterstl.com | Residential HVAC Service, Residential HVAC | St. Louis |
| CNJ Mechanical Contractors, LLC | (314) 351-1562 | http://cnjmechanical.com | x.Minority Owned Business (MBE), x.Woman Owned Business (WBE), Welding, Commercial HVAC, Full Mechanical, Industrial HVAC | St. Louis |
| Coleman Heating & Sheet Metal, Inc. | (314) 291-8884 | http://www.chsminc.com/ | HVAC Service, Residential HVAC Service, Commercial HVAC, Residential HVAC | St. Louis |
| Commercial Bathwares, LC | (314) 256-0985 | http://commercialbathwareslc.com/ | Fire Life Safety, Lockers, Toilet Partitions, x.Woman Owned Business (WBE) | St. Louis |
| Controlled Heating & Air Conditioning, Inc. | (636) 296-2627 | http://controlledhvac.com/ | Commercial HVAC, HVAC Service, Light Commercial HVAC, Residential HVAC, Residential HVAC for New Home Construction, Residential Metals | St. Louis |
| Cozy Heating & Cooling | (417) 880-8862 | HVAC Service, Residential HVAC Service, Residential HVAC, Residential HVAC for New Home Construction, Light Commercial HVAC, Light Commercial HVAC Service | Southwest MO | |
| Crestside Ballwin Heating & Air Conditioning Co. Inc. | (314) 351-8300 | http://www.crestside.com | HVAC Service, Commercial HVAC, Residential HVAC, Fireplace, Wood Furnace | St. Louis |
| Crystal Heating & Cooling | (636) 937-2927 | https://crystalheatingandcooling.com/ | Air/Water System Balancing, Residential HVAC Service, Commercial Kitchens, Commercial HVAC, Residential HVAC, Residential HVAC for New Home Construction, Full Mechanical, Light Commercial HVAC, Light Commercial HVAC Service, Duct Cleaning | St. Louis |
| Degenhardt Heating & Cooling Inc. | (314) 631-1554 | http://www.degenhardthc.com/ | Commercial HVAC, HVAC Service, Light Commercial HVAC, Residential HVAC, Residential HVAC for New Home Construction | St. Louis |
| Design Aire Heating & Cooling | (314) 739-1600 | https://www.designaire.net/ | Copper Work, Custom Metal Fab, Fire Life Safety, Full Mechanical, HVAC Service, Light Commercial HVAC, Residential HVAC, Residential HVAC for New Home Construction, Residential Metals | St. Louis |
| DH&A Sheet Metal | (636) 349-5801 | http://www.dhasheetmetal.com/ | Commercial Roofing, Commercial Wall Panels, Custom Metal Fab | St. Louis |
| Diehl Enterprise LLC | (314) 540-2691 | Fireplace, Wood Furnace | St. Louis | |
| Diversified Industrial Mechanical Contractors (DIMC) | (573) 634-8247 | http://dimconline.com | Welding, Custom Metal Fab | Central MO |
| Dynamic Air Solutions, LLC | (314) 395-9125 | http://www.dynamicair-stl.com | HVAC Service | St. Louis |
| Eagle Sheet Metal Works Inc. | (417) 866-1984 | Custom Metal Fab | Southwest MO | |
| Environmental Engineering, Inc. | (573) 636-3566 | http://www.enviroeng.com | Air/Water System Balancing, HVAC Service, Residential HVAC Service, Welding, Commercial HVAC, Residential HVAC, Custom Ornamental, Custom Metal Fab, Industrial HVAC Service, Industrial HVAC | Central MO |
| Fire Stop Technologies, Inc. | (314) 644-5323 | http://www.firestopstl.com | x.Woman Owned Business (WBE), Fire Life Safety | St. Louis |
| Fischer Mechanical LLC | (636) 928-2983 | https://fischermechanical.com/ | HVAC Service, Commercial Kitchens, x.Woman Owned Business (WBE), Residential Metals, Welding, Commercial HVAC, Residential HVAC, Custom Metal Fab, Full Mechanical, Industrial HVAC Service, Industrial HVAC | St. Louis |
| Frank Fischer, Inc. | (314) 739-1600 | https://www.designaire.net/ | Commercial HVAC | St. Louis |
| Fresh Air Heating and Cooling | (636) 530-0070 | http://www.ineedfreshair.com | Residential HVAC, x.Woman Owned Business (WBE) | St. Louis |
| Galmiche & Sons Heating & Cooling | (314) 993-1110 | http://www.galmicheandsons.com/ | HVAC Service, Commercial HVAC, Residential HVAC | St. Louis |
| Gennesaret Mechanical Services, LLC | (314) 845-4939 | http://gennesaretmechanicalservices.com | Air/Water System Balancing, Commercial HVAC | St. Louis |
| Haberberger Inc. | (314) 631-3324 | http://www.haberbergerinc.com/ | Commercial HVAC, Full Mechanical | St. Louis |
| Harold G. Butzer, Inc (swmo) | (573) 636-4115 | http://www.hgbutzer.com | Nuclear HVAC, Commercial Kitchens, Residential Metals, Welding, Commercial HVAC, Custom Metal Fab, Lockers, Shelving, Cabinets, Full Mechanical, Light Commercial HVAC, Light Commercial HVAC Service, Industrial HVAC Service, Industrial HVAC, Toilet Partitions | Southwest MO |
| Harold G. Butzer, Inc. | (573) 636-4115 | http://www.hgbutzer.com | Nuclear HVAC, Commercial Kitchens, Residential Metals, Welding, Commercial HVAC, Custom Metal Fab, Lockers, Shelving, Cabinets, Full Mechanical, Light Commercial HVAC, Light Commercial HVAC Service, Industrial HVAC Service, Industrial HVAC, Toilet Partitions | Central MO |
| Hauser Mechanical, Inc. | (636) 970-4416 | Air/Water System Balancing, HVAC Service, Welding, Commercial HVAC, Custom Metal Fab, Full Mechanical, Light Commercial HVAC, Light Commercial HVAC Service, Industrial HVAC Service, Industrial HVAC | St. Louis | |
| Hopmann Cornice Company | (314) 241-4129 | Copper Work, Custom Ornamental | St. Louis | |
| Hulett Heating & Air Conditioning (cmo) | (573) 449-3196 | http://hulettheating.com | Air/Water System Balancing, HVAC Service, Welding, Commercial HVAC, Custom Ornamental, Custom Metal Fab, Full Mechanical, Industrial HVAC Service, Industrial HVAC | Central MO |
| Hulett Heating & Air Conditioning (swmo) | (573) 449-3196 | Air/Water System Balancing, HVAC Service, Welding, Commercial HVAC, Custom Ornamental, Custom Metal Fab, Full Mechanical, Industrial HVAC Service, Industrial HVAC | Southwest MO | |
| Hyde Sheet Metal, Inc. | (314) 423-2332 | http://www.hydesheetmetal.com | Commercial Roofing, Commercial Wall Panels, Copper Work, Custom Metal Fab, Custom Ornamental, Residential Metals, Seamless Gutters | St. Louis |
| Icon Mechanical | (618) 452-0035 | http://www.iconmech.com/ | HVAC Service, Commercial HVAC, Custom Metal Fab, Full Mechanical | St. Louis |
| Industrial Enterprises, Inc. | (573) 893-8384 | http://www.ieimidmo.com | HVAC Service, Welding, Commercial HVAC, Custom Metal Fab, Industrial HVAC Service, Industrial HVAC | Central MO |
| Integrated Facility Services (IFS) | (636) 680-2100 | http://intfs.com/ | Air/Water System Balancing, Commercial HVAC, Custom Metal Fab, Full Mechanical | St. Louis |
| IWR North America, LLC | (314) 633-4958 | http://www.iwrna.com | Copper Work, Welding, Custom Ornamental | St. Louis |
| Jen Mechanical, Inc. | (618) 779-6632 | http://jenmechanical.com/ | Commercial HVAC, Commercial Kitchens, Custom Metal Fab, Full Mechanical, HVAC Service, Industrial HVAC, Light Commercial HVAC, Residential HVAC, Residential HVAC for New Home Construction, Residential Metals, Welding | St. Louis |
| Kaemmerlen Facility Solutions | (314) 535-2222 | http://kaemmerlensolutions.com/ | Commercial Kitchens, Commercial HVAC, Full Mechanical | St. Louis |
| Kane Mechanical Group, LLC | (618) 254-0681 | http://www.kanemechanical.com/ | HVAC Service, Commercial Kitchens, Welding, Commercial HVAC, Custom Metal Fab, Full Mechanical, Light Commercial HVAC, Light Commercial HVAC Service, Industrial HVAC Service, Industrial HVAC, Duct Cleaning | St. Louis |
| Kindle Heating And Cooling | (636) 717-0808 | http://kindleheating.com/ | Commercial HVAC, Residential HVAC | St. Louis |
| Lakebrink Heating & Air Conditioning | (636) 583-3365 | https://www.lakebrinkhvac.com/ | Commercial HVAC, HVAC Service, Light Commercial HVAC, Residential HVAC for New Home Construction, Residential Metals | St. Louis |
| Langford Mechanical & Sheet Metal Inc. | (573) 243-3238 | http://langfordmechanical.com | HVAC Service, Residential HVAC Service, Commercial Kitchens, Commercial HVAC, Residential HVAC, Custom Metal Fab, Residential HVAC for New Home Construction, Full Mechanical, Light Commercial HVAC, Light Commercial HVAC Service | St. Louis |
| Lehmen Heating & Cooling, LLC | (573) 257-0516 | Residential HVAC Service, Residential HVAC, Light Commercial HVAC, Light Commercial HVAC Service | Central MO | |
| Lyon Sheet Metal, Inc. | (314) 352-8181 | http://www.lyonshtmtl.com/ | BIM, CAD, Commercial HVAC, Commercial Kitchens, Copper Work, Custom Metal Fab, Fire Life Safety, Full Mechanical, HVAC Service, Industrial HVAC, Light Commercial HVAC, Nuclear HVAC, Welding | St. Louis |
| M. J. Products Company, Inc. | (636) 349-0290 | http://www.mjproductsco.com/ | Lockers, Shelving, Cabinets, Toilet Partitions | St. Louis |
| M.V.L Mechanical LLC | (314) 277-9336 | Commercial Kitchens, Welding, Commercial HVAC, Residential HVAC, Light Commercial HVAC | St. Louis | |
| Mantle Heating & Cooling LLC | (636) 221-1313 | https://www.mantleheatingandcooling.com/ | Residential HVAC Service, Residential HVAC, Residential HVAC for New Home Construction, Light Commercial HVAC, Light Commercial HVAC Service | St. Louis |
| Mechanical Analysis Systems Testing LLC | (618) 974-5422 | Air/Water System Balancing | St. Louis | |
| Mechanical Solutions Inc. | (314) 342-1480 | http://www.msi-stl.com/ | Air/Water System Balancing, HVAC Service, x.Minority Owned Business (MBE), Commercial HVAC, Full Mechanical | St. Louis |
| Mechanical Testing Inc. (MTI) | (314) 432-5100 | http://www.mechtest.com | Air/Water System Balancing, Fire Life Safety | St. Louis |
| Meinershagen Roofing & Sheet Metal, LLC | (573) 431-9099 | http://www.meinershagenroof.com/ | Seamless Gutters, Residential Metals, Custom Ornamental, Commercial Roofing | St. Louis |
| Merkel Mechanical, Inc. | (636) 978-7599 | HVAC Service, Residential HVAC Service, Commercial HVAC, Residential HVAC, Residential HVAC for New Home Construction, Light Commercial HVAC, Light Commercial HVAC Service | St. Louis | |
| Mexico Heating Company Inc. | (573) 581-4293 | http://www.mexicoheating.com | Commercial Kitchens, Welding, Commercial HVAC, Custom Ornamental, Custom Metal Fab, Industrial HVAC | Central MO |
| Mid-State Mechanical, LLC | (636) 696-6333 | http://www.midstatemo.com | Commercial HVAC, Residential HVAC, Custom Ornamental, Custom Metal Fab, Residential HVAC for New Home Construction | St. Louis |
| Miller & Associates Testing & Balancing | (314) 961-4018 | http://www.millertab.com | Air/Water System Balancing, Fire Life Safety | St. Louis |
| Miller Certified Air, Inc. | (314) 352-8981 | http://www.millercertifiedair.com/ | Air/Water System Balancing | St. Louis |
| Missouri Builders Service (cmo) | (573) 636-9113 | https://www.missouribuilders.net/ | Copper Work, Custom Ornamental | Central MO |
| Missouri Builders Service (STL) | (314) 872-3400 | https://www.missouribuilders.net/ | Copper Work, Custom Ornamental | St. Louis |
| Missouri Builders Service, Inc. (swmo) | (573) 636-9113 | http://www.missouribuilders.net | Copper Work, Custom Ornamental | Southwest MO |
| MO Welding Solutions LLC | (573) 819-2136 | http://www.moweldingsolutions.com | Commercial HVAC, Custom Metal Fab, HVAC Service, Industrial HVAC, Light Commercial HVAC, Residential HVAC, Welding | Central MO |
| Murphy Company | (314) 997-6600 | http://www.murphynet.com | Air/Water System Balancing, HVAC Service, Commercial HVAC, Custom Metal Fab, Full Mechanical | St. Louis |
| Natsch & Company, Inc. | (573) 636-9114 | http://www.natschmtl.com | Commercial Roofing, Commercial Wall Panels, Copper Work, Seamless Gutters, x.Woman Owned Business (WBE) | Central MO |
| Nooter Construction Company | (314) 421-7600 | http://nooterconstruction.com | Residential HVAC, Light Commercial HVAC, Light Commercial HVAC Service | St. Louis |
| Ozark Mechanical LLC | (636) 317-1234 | https://ozarkmechanical.com/ | Copper Work, HVAC Service, Residential HVAC Service, Commercial HVAC, Residential HVAC, Full Mechanical, Light Commercial HVAC, Light Commercial HVAC Service | St. Louis |
| Ozark Mechanical LLC (CMO) | (573) 964-5966 | https://ozarkmechanical.com/ | Copper Work, HVAC Service, Commercial HVAC, Residential HVAC, Full Mechanical, Light Commercial HVAC, Light Commercial HVAC Service | Central MO |
| Peak Climate Mechanical | (573) 679-4828 | http://www.peakclimatehvac.com | Air/Water System Balancing, HVAC Service, Commercial HVAC, Residential HVAC, Full Mechanical, Light Commercial HVAC, Industrial HVAC Service | Central MO |
| Peters-Eichler Mechanical, Inc. | (314) 647-4023 | http://www.peters-eichler.com/ | Commercial HVAC, Custom Metal Fab, Full Mechanical | St. Louis |
| Pipe & Duct Systems LLC | (636) 677-6100 | https://pipeandductsystems.com/ | Air/Water System Balancing, HVAC Service, Commercial Kitchens, Fire Life Safety, Welding, Commercial HVAC, Custom Ornamental, Custom Metal Fab, Full Mechanical, Light Commercial HVAC, Light Commercial HVAC Service | St. Louis |
| Premier Balancing & Life Safety Services | (314) 580-9802 | Air/Water System Balancing, Fire Life Safety | St. Louis | |
| Premier Heating & Cooling, Inc. | (636) 916-1120 | http://www.premierheatingcooling.net/ | Air/Water System Balancing, Commercial HVAC, Commercial Kitchens, Fire Life Safety, Full Mechanical, HVAC Service, Light Commercial HVAC, Residential HVAC, Residential HVAC for New Home Construction, Residential Metals, Welding | St. Louis |
| Professional Metal Fabricators, LLC (PMF) | (573) 634-1069 | https://prometalfab.com/ | Welding, Custom Metal Fab | Central MO |
| R. F. Meeh Company | (636) 349-4990 | http://rfmeeh.com/ | Air/Water System Balancing, BIM, CAD, Commercial HVAC, Custom Metal Fab, Fire Life Safety, Full Mechanical, HVAC Service, Light Commercial HVAC, Residential HVAC, Welding | St. Louis |
| Rathgeber Heating Company, Inc. | (314) 846-4801 | Residential HVAC, Fireplace, Wood Furnace | St. Louis | |
| RAW Sheet Metal, LLC | (573) 535-9696 | Copper Work, Seamless Gutters, Residential Metals, Custom Metal Fab, Commercial Wall Panels, Commercial Roofing | St. Louis | |
| Reinhold Electric, Inc. (cmo) | (314) 574-9358 | HVAC Service, Commercial Kitchens, Commercial HVAC, Residential HVAC, Light Commercial HVAC, Industrial HVAC | Central MO | |
| Reinhold Electric, Inc. (stl) | (314) 631-1158 | https://www.reinholdelectric.com/ | HVAC Service, Residential HVAC Service, Commercial HVAC, Light Commercial HVAC Service | St. Louis |
| RMB Mechanical | (314) 410-7910 | https://www.rmbmech.com/ | x.Minority Owned Business (MBE), x.Woman Owned Business (WBE), Commercial HVAC, Residential HVAC, Full Mechanical, x.Small Disadvantaged Business (SDB), Light Commercial HVAC Service, Commercial Wall Panels, Duct Cleaning | Central MO |
| Rock Hill Mechanical Corp. | (314) 966-0600 | http://www.rhmcorp.com | Commercial HVAC, Custom Metal Fab, Full Mechanical | St. Louis |
| Saint Louis Metalworks Co. | (636) 387-1855 | Commercial Roofing, Commercial Wall Panels, Copper Work, Custom Metal Fab, x.Veteran Owned | St. Louis | |
| Scott-Lee Guttering Company, Inc. | (314) 756-9440 | http://www.scottleeguttering.com | Copper Work, Seamless Gutters, Custom Ornamental | St. Louis |
| Scott-Lee Heating Company, Inc. | (314) 756-9444 | https://scottleeheating.com | Copper Work, Custom Metal Fab, Custom Ornamental, Full Mechanical, HVAC Service, Light Commercial HVAC, Residential HVAC, Residential HVAC for New Home Construction, Residential Metals, x.SBA (8a) Certified, x.Veteran Owned | St. Louis |
| Scott’s Fireplace Service | (314) 915-7066 | www.scottsfireplace.com | Fireplace | St. Louis |
| Sheet Metal Contractors Inc. (SMCI) | (636) 337-2150 | http://www.smcihvac.com/ | HVAC Service, Residential HVAC Service, Commercial Kitchens, Residential Metals, Commercial HVAC, Residential HVAC, Custom Ornamental, Custom Metal Fab, Full Mechanical, Light Commercial HVAC, Light Commercial HVAC Service, Duct Cleaning | St. Louis |
| Springfield Engineering Company (SECO) | (417) 869-1539 | http://springfieldengineering.com | BIM, CAD, Commercial HVAC, Commercial Kitchens, Copper Work, Custom Metal Fab, Full Mechanical, HVAC Service, Industrial HVAC, Light Commercial HVAC, Residential HVAC, Welding | Southwest MO |
| St. Louis Sheetmetal Corp. | (314) 960-8927 | Commercial HVAC, Light Commercial HVAC | St. Louis | |
| Supplied Industrial Solutions (SIS) | (618) 452-8151 | http://www.suppliedindustrial.com | Air/Water System Balancing, x.Minority Owned Business (MBE), Commercial HVAC, x.Veteran Owned, x.Small Disadvantaged Business (SDB), x.HUBZone Business Enterprise (HBE), x.SBA (8a) Certified | St. Louis |
| Survant HVAC LLC | (636) 745-7353 | http://www.survanthvac.com | HVAC Service, Residential HVAC Service, Residential HVAC, Residential HVAC for New Home Construction, Duct Cleaning | St. Louis |
| Teel Mechanical Service, Inc. | (573) 642-9648 | http://www.teelmechanical.com/ | HVAC Service, Residential HVAC Service, Commercial Kitchens, Welding, Commercial HVAC, Residential HVAC, Custom Metal Fab, Industrial HVAC Service, Industrial HVAC | Central MO |
| The Waldinger Corporation-Springfield/Connelly | (417) 866-2262 | HVAC Service, Residential HVAC Service, Commercial Kitchens, Commercial HVAC, Residential HVAC, Custom Metal Fab, Residential HVAC for New Home Construction, Full Mechanical, Light Commercial HVAC, Light Commercial HVAC Service, Industrial HVAC Service, Industrial HVAC, BIM, CAD, Duct Cleaning | Southwest MO | |
| Union Tank Erection, Inc. | (501) 961-2501 | Custom Metal Fab | Arkansas | |
| Veterans Holdings LLC | (314) 960-0043 | HVAC Service, x.Minority Owned Business (MBE), x.Woman Owned Business (WBE), Welding, Commercial HVAC, Residential HVAC, BIM, CAD | St. Louis | |
| Veterans HVAC | (636) 253-3225 | https://VeteransHVAC.net | Commercial HVAC, HVAC Service, Light Commercial HVAC, Residential HVAC, x.Veteran Owned, x.Woman Owned Business (WBE) | St. Louis |
| Vogel Sheet Metal & Heating, Inc. | (314) 351-2533 | https://www.vogelheating.com/ | Commercial HVAC, Residential HVAC, Custom Ornamental, Duct Cleaning | St. Louis |
| Warehouse Design & Services, Inc. | (314) 838-8819 | Lockers, Shelving, Cabinets, Toilet Partitions | St. Louis | |
| Watkins Roofing Co. (cmo) | (573) 449-2951 | http://www.watkinsroofing.net/ | Custom Ornamental | Central MO |
| Watkins Roofing Co. (swmo) | (573) 449-2951 | Southwest MO | ||
| Welsch Heating & Cooling Co. | (314) 872-8070 | http://welsch-heatcool.com | Copper Work, HVAC Service, Light Commercial HVAC, Residential HVAC, Residential HVAC for New Home Construction | St. Louis |
| Western Blow Pipe, Inc. | (314) 832-5700 | http://www.westernblowpipe.net/ | Custom Ornamental, Custom Metal Fab, Welding | St. Louis |
| Wiegmann Associates Inc. | (636) 940-1056 | https://www.wiegmannassoc.com/ | HVAC Service, Welding, Commercial HVAC, Full Mechanical | St. Louis |
| WMC Mechanical Inc. (CMO) | (417) 873-9300 | http://www.wmcmechanical.com | HVAC Service, Commercial Kitchens, Commercial HVAC, Custom Ornamental, Custom Metal Fab, Full Mechanical, x.Disabled Veteran Enterprise (DVBE), Industrial HVAC Service, Industrial HVAC | Central MO |
| WMC Mechanical Inc. (SWMO) | (417) 873-9300 | http://www.wmcmechanical.com | HVAC Service, Commercial Kitchens, Welding, Commercial HVAC, Custom Ornamental, Custom Metal Fab, Full Mechanical, Industrial HVAC Service, Industrial HVAC | Southwest MO |
| Zipf-Air, Inc. | (314) 821-1200 | http://zipfair.com | Residential HVAC | St. Louis |