| Trade Mechanical Contractors Inc. | Oklahoma City | OK | $6.96M |
| Tri State Automatic Sprinkler, Inc. | Davenport | IA | $6.91M |
| Cci Mechanical, LLC | Manchester | ME | $6.77M |
| Blueridge Technology, Inc. | Signal Hill | CA | $6.65M |
| US Engineering Service LLC | Kansas City | MO | $6.42M |
| Qa & SW Construction LLC | Austell | GA | $6.13M |
| Bci Services Inc. | Conroe | TX | $6.03M |
| Firetrol Protection Systems, Inc. | Mobile | AL | $5.92M |
| S & S Plumbing, Heating And Air Conditioning Corp. | Weatherly | PA | $5.85M |
| T & D Barrs Plumbing And Heating Limited | Ware | | $5.84M |
| Pritchett Controls, Inc. | Beltsville | MD | $5.8M |
| G1 Construction, Inc. | Atlanta | GA | $5.67M |
| J. & L. Mavilia Incorporated | Upper Marlboro | MD | $5.56M |
| Jim Jam, Inc. | Shawnee | KS | $5.5M |
| SMNC Solutions, LLC | Anchorage | AK | $5.42M |
| Weathertrol Maintenance Corp. | Sweetwater | FL | $5.41M |
| Nippon Bldg.care Limited | Shinjuku | | $5.35M |
| Palgag - Z.G.S | Tel Aviv | | $5.31M |
| Jett's Mechanical, LLC | Paducah | KY | $5.28M |
| Veterans Facility Services, Inc. | Cataula | GA | $5.12M |
| Hapec Co. Ltd. | Sasebo | | $5.07M |
| Agbw Corp. | Chula Vista | CA | $5.06M |
| Service Mechanical Inc. | Lorton | VA | $5.02M |
| Quality Refrigeration Company, Inc.Wilmington, CA · UEI YJMAH6NFW2M9 | Wilmington | CA | $5M |
| Mckinstry Co. LLC | Seattle | WA | $4.99M |
| Total Solution LLC | Santa Ana | CA | $4.97M |
| Control Services Inc. | Omaha | NE | $4.91M |
| Crazeweld LLC | Norwalk | OH | $4.83M |
| A And W Electrical And Refrigeration A/c Inc. | Morovis | PR | $4.77M |
| Bright Co. Ltd. | Higashikurume-shi | | $4.76M |
| Mastercraft Mechanical Contractors, Inc. | Odon | IN | $4.75M |
| Northwest Hvac Solutions, LLC | Anchorage | AK | $4.56M |
| KZN Insaat Taahhut Ticaret Ithalat Ihracat Sanayi Limited Sirketi | Saricam | | $4.43M |
| Succor Inc. | Virginia Beach | VA | $4.39M |
| Precision Mechanical Services, LLC | Philadelphia | PA | $4.29M |
| South Town Refrigeration, LLC | Frankfort | IL | $4.27M |
| Voris Mechanical Inc. | Glendale Heights | IL | $4.18M |
| R P Mechanical Hvacr LLC | Natchez | MS | $4.12M |
| Facility Improvement Corporation | Great Falls | MT | $4.08M |
| Ihp Industrial Inc. | Saint Joseph | MO | $4.04M |
| Accu-aire Mechanical LLC | San Antonio | TX | $3.94M |
| S & D Mechanical Services, Inc. | Grand Blanc | MI | $3.9M |
| Angelo Sassi & Son Plumbing & Heating, Inc. | Farmington | NH | $3.84M |
| Pacific International Trading Contracting And Services | Doha | | $3.82M |
| Mechanical Services Of Central Florida, Inc. | Orlando | FL | $3.79M |
| Wayne Crouse Inc. | Pittsburgh | PA | $3.78M |
| Thermo Dynamics Inc. | Eliot | ME | $3.77M |
| Quality Refrigeration Company, Inc.San Diego, CA · UEI ZPZRK3NKE5Q6 | San Diego | CA | $3.75M |
| Schmolck Mechanical Contractors Inc. | Ketchikan | AK | $3.63M |
| LTM, Corporation | Aiea | HI | $3.62M |
| City Air Mechanical, Inc. | Bismarck | ND | $3.57M |
| William A. Harrison, Inc. | Little Rock | AR | $3.54M |
| Clean Water Mechanical And Construction LLC | Buffalo | NY | $3.48M |
| I.a.p. Contractors, L.L.C | Luquillo | PR | $3.45M |
| Welding Processes And Mechanical, Inc. | Ashland | VA | $3.42M |
| Valkyrie Mechanical JV LLC | Suisun City | CA | $3.37M |
| Fluidics Inc. | Philadelphia | PA | $3.37M |
| Jackson Mechanical Service Inc. | Oklahoma City | OK | $3.35M |
| Dellew Corp. | Waipahu | HI | $3.35M |
| Mechanical Construction Managers, LLC | Dayton | OH | $3.32M |
| Isonmase, LLC | Juncos | PR | $3.3M |
| Global Service Titan LLC | Flowery Branch | GA | $3.3M |
| Precision Mechanical, LLP | Rapid City | SD | $3.27M |
| All American Federal Construction LLC | Katy | TX | $3.18M |
| Mckenney's, Inc. | Atlanta | GA | $3.16M |
| Bj Medical Supply Delivery Service LLC | Temple Hills | MD | $3.1M |
| Lieber Mechanical LLC | Yukon | OK | $2.99M |
| Andrews Plumbing Services Inc. | Scottsdale | AZ | $2.94M |
| Mepvet LLC | Elyria | OH | $2.93M |
| Tate Engineering Systems Inc. | Salisbury | MD | $2.86M |
| Ses Technologies LLC | Snoqualmie | WA | $2.81M |
| Delta Mechanical Contractors LLC | Warwick | RI | $2.79M |
| Sure Drain, LLC | Bristol | VA | $2.79M |
| Sultan Airconditioning & Refrigeration Services W.L.L. | Manama | | $2.77M |
| CM3 Building Solutions Inc. | Fort Washington | PA | $2.69M |
| Xl Mechanical & Energy Management Services | Bangor | ME | $2.68M |
| Portable Air And Power, LLC | Byron | GA | $2.65M |
| Monaco Mechanical, Inc. | Los Angeles | CA | $2.65M |
| R.f. Macdonald Co. LLC | Hayward | CA | $2.65M |
| Terry Service, Inc. | Ridgeland | MS | $2.64M |
| Centerline Mechanical LLC | Tucson | AZ | $2.63M |
| Ibs L.L.C | Cromwell | CT | $2.62M |
| C.e D.impianti Societa A Responsabilita Limitata | Roma | RM | $2.61M |
| Frye Mechanical Inc. | Dayton | OH | $2.59M |
| C & C Boiler Sales & Service Inc. | Charlotte | NC | $2.59M |
| Silver National Corp. | Bay Shore | NY | $2.55M |
| Connecticut Boiler Repair And Manufacturing Co. Incorporated | West Hartford | CT | $2.5M |
| Powell Construction Services, Inc. | Peachtree City | GA | $2.47M |
| Multi Air Services Engineers Corp. | Rio Grande | PR | $2.47M |
| Yearout Mechanical, LLC / Dba: Welch's Boiler Service, LLC | Albuquerque | NM | $2.46M |
| Cauvin Guy SPRL | Ath | | $2.45M |
| Luther Industries LLC | Blanchard | OK | $2.44M |
| American Testing, Inc. | Ellicott City | MD | $2.44M |
| Pyro Combustion & Controls Inc. | Las Vegas | NV | $2.42M |
| Summit Fire & Security LLC | Reno | NV | $2.42M |
| Kriotec Kalte + Klima GMBH | Mainz-kastel | | $2.41M |
| Osung Engineering | Pyeongtaek-si | GYEONGGI-DO | $2.37M |
| Fire & Life Safety Consultants LLC | Aurora | IL | $2.37M |
| American Mechanical Services Of Maryland, L.L.C. | Laurel | MD | $2.36M |
| Yorkaire, Inc. | York | PA | $2.3M |
