| MMMoorehead Machinery and Boiler Company | Wheatland | WY | — | ◇ UNVERIFIED |
| MLMorrCo LLC | Spokane Valley | WA | — | ◇ UNVERIFIED |
| MSMotiv Space Systems | Pasadena | CA | — | ◇ UNVERIFIED |
| MIMunroe, INC. | Ringgold | GA | — | ◇ UNVERIFIED |
| MIMunroe, INC. | Ambridge | PA | — | ◇ UNVERIFIED |
| MCMunters Corporation | Natural Bridge Station | VA | — | ◇ UNVERIFIED |
| MVMustang Vacuum Systems | Sarasota | FL | — | ◇ UNVERIFIED |
| MHMy Hoosier Hearth LLC | Seymour | IN | — | ◇ UNVERIFIED |
| NMNabors Mechanical Constractors INC. | Ohatchee | AL | — | ◇ UNVERIFIED |
| NCNalco Company | Ontario | CA | — | ◇ UNVERIFIED |
| NINanonexus, INC | San Jose | CA | — | ◇ UNVERIFIED |
| NBNational Boiler Service, INC. | Panama City | FL | — | ◇ UNVERIFIED |
| NBNational Boiler Service, INC. | Queen City | TX | — | ◇ UNVERIFIED |
| NBNational Boiler Services INC. | Covington | VA | — | ◇ UNVERIFIED |
| NFNational Fabtronix INC | Hayward | CA | — | ◇ UNVERIFIED |
| NCNatrona County School Distric | Casper | WY | — | ◇ UNVERIFIED |
| NBNew Buck CORP | Spruce Pine | NC | — | ◇ UNVERIFIED |
| NCNieco CORP | Windsor | CA | — | ◇ UNVERIFIED |
| NJN J Mccutchen INC | Stockton | CA | — | ◇ UNVERIFIED |
| NINordyne Inc-grand Plant | Saint Louis | MO | — | ◇ UNVERIFIED |
| NHNortheast Hydronic Radiant INC. | Bohemia | NY | — | ◇ UNVERIFIED |
| NINovy International INC. | Danbury | CT | — | ◇ UNVERIFIED |
| OGOld Grove, LLC | San Diego | CA | — | ◇ UNVERIFIED |
| OMOliver Manufacturing CO - La Junta | La Junta | CO | — | ◇ UNVERIFIED |
| OMOliver Manufacturing Company, INC. | Rocky Ford | CO | — | ◇ UNVERIFIED |
| OIOmnifab INC | Santa Clara | CA | — | ◇ UNVERIFIED |
| OHOneida Heater Company INC | Oneida | NY | — | ◇ UNVERIFIED |
| OHOutokumpu Heatcraft USA | Murfreesboro | TN | — | ◇ UNVERIFIED |
| PDParamount Duct and Vent Cleaning LCC | Red Lodge | MT | — | ◇ UNVERIFIED |
| PBParker Boiler CO. | Commerce | CA | — | ◇ UNVERIFIED |
| PCParts Cleaning Technologies | Bowling Green | KY | — | ◇ UNVERIFIED |
| PRPaso Robles Tank INC | Hemet | CA | — | ◇ UNVERIFIED |
| PRPaso Robles Tank INC | Paso Robles | CA | — | ◇ UNVERIFIED |
| PEPatriot Enterprises of Ohio | North Canton | OH | — | ◇ UNVERIFIED |
| PTPatriot Thermal Controls, Inc. | Warwick | RI | — | ◇ UNVERIFIED |
| PDPetersen Dean, INC. | Madera | CA | — | ◇ UNVERIFIED |
| PMP&f Machine | Turlock | CA | — | ◇ UNVERIFIED |
| PMPlant Maintenance Service Corporation | Memphis | TN | — | ◇ UNVERIFIED |
| PBPlouffe's Boiler and Mechanical Service INC. | Middlebury | VT | — | ◇ UNVERIFIED |
| PIPoppe INC. | Hickory | NC | — | ◇ UNVERIFIED |
| PTPorter Tire Center INC | Olive Hill | KY | — | ◇ UNVERIFIED |
| PEPowerhouse Equipment | Gastonia | NC | — | ◇ UNVERIFIED |
| PPPower Products and Engineering, LLC | Trenton | NJ | — | ◇ UNVERIFIED |
| PBPrecision Blend Gases, INC. | Dickinson | TX | — | ◇ UNVERIFIED |
| PMPrecision Micro Components | Redwood City | CA | — | ◇ UNVERIFIED |
| PIPrice Industries, INC. | Casa Grande | AZ | — | ◇ UNVERIFIED |
| PMProgressive Manufacturing INC | Newport | NH | — | ◇ UNVERIFIED |
| PMPsi Manufacturing | Escondido | CA | — | ◇ UNVERIFIED |
| QSQuality Stoves & Spas | Post Falls | ID | — | ◇ UNVERIFIED |
| RGRandstad General Partner US LLC | Minneapolis | MN | — | ◇ UNVERIFIED |
| RIRaypak INC | Westlake Village | CA | — | ◇ UNVERIFIED |
| RDRed Dot CORP Puyallup | Puyallup | WA | — | ◇ UNVERIFIED |
| RIReed International Dba Saunco Air Tech | Hickman | CA | — | ◇ UNVERIFIED |
| RBRentech Boiler Services INC | Abilene | TX | — | ◇ UNVERIFIED |
| RRetech | Ukiah | CA | — | ◇ UNVERIFIED |
| RCRichardson Cooling Packages, LLC | New Castle | PA | — | ◇ UNVERIFIED |
| RFRich's for the Home | Tukwila | WA | — | ◇ UNVERIFIED |
| RPRiley Power INC | Gallatin | TN | — | ◇ UNVERIFIED |
| RPRiley Power INC | Worcester | MA | — | ◇ UNVERIFIED |
| RERite Engineering & Manufacturing CORP | Commerce | CA | — | ◇ UNVERIFIED |
| RERite Engineering & Mfg CORP | Downey | CA | — | ◇ UNVERIFIED |
| RRR.J.R. Radiator, Inc. | Cincinnati | OH | — | ◇ UNVERIFIED |
| RTRlc Technologies Incorporated | Glen Allen | VA | — | ◇ UNVERIFIED |
| ROR. O. Apelt Sons INC. (1318002449) | Cleveland | OH | — | ◇ UNVERIFIED |
| RHRobert Howard | Phelan | CA | — | ◇ UNVERIFIED |
| RHRobert H Peterson CO | La Puente | CA | — | ◇ UNVERIFIED |
| RCRoberto Colon Dba/ Puerto Rico Solar Products | Moca | PR | — | ◇ UNVERIFIED |
| RTRocore Thermal Systems LLC | Burkesville | KY | — | ◇ UNVERIFIED |
| RIRootlieb INC | Turlock | CA | — | ◇ UNVERIFIED |
| RIRPPG, Inc. | Winfield | KS | — | ◇ UNVERIFIED |
| RCRp/presidio Central Campus Own | Santa Clara | CA | — | ◇ UNVERIFIED |
| RNRuntal North America | Haverhill | MA | — | ◇ UNVERIFIED |
| RRRural Renewable Energy Alliance Dba Rreal | Pine River | MN | — | ◇ UNVERIFIED |
| SCSabrin CORP Dba Astronic CO | Pasadena | CA | — | ◇ UNVERIFIED |
| SSSanmina - Sci | Newark | CA | — | ◇ UNVERIFIED |
| SBSar Biomass Energy Systems | Pocahontas | IA | — | ◇ UNVERIFIED |
| SMScheu Manufacturing Company | Rancho Cucamonga | CA | — | ◇ UNVERIFIED |
| SFSchwabel Fabricating Com INC | Tonawanda | NY | — | ◇ UNVERIFIED |
| SPSheco Plant 2 | Tuscaloosa | AL | — | ◇ UNVERIFIED |
| SUSilent-aire USA INC. | Gilbert | AZ | — | ◇ UNVERIFIED |
| SESmithco Engineering INC | Tulsa | OK | — | ◇ UNVERIFIED |
| SRSnap Rite Manufacturing, INC. | Lake Park | GA | — | ◇ UNVERIFIED |
| SHSocal Hydraulics | El Cajon | CA | — | ◇ UNVERIFIED |
| STSofiane Talbi | Cary | NC | — | ◇ UNVERIFIED |
| SISolar4pools INC | Sykesville | MD | — | ◇ UNVERIFIED |
| SISolarhawk, INC. | Los Angeles | CA | — | ◇ UNVERIFIED |
| SSSolar Skies Mfg LLC | Alexandria | MN | — | ◇ UNVERIFIED |
| SUSolartech Universal, LLC | Riviera Beach | FL | — | ◇ UNVERIFIED |
| STSo-semi Technologies Dba Optopax | San Jose | CA | — | ◇ UNVERIFIED |
| SHSouthern Hearth & Patio | Chattanooga | TN | — | ◇ UNVERIFIED |
| SHSouthern Heat Exchanger | Tuscaloosa | AL | — | ◇ UNVERIFIED |
| S2Spamex 2, LLC | Hartford | WI | — | ◇ UNVERIFIED |
| SHSpx Heat Transfer INC. | Tulsa | OK | — | ◇ UNVERIFIED |
| SHSpx Heat Transfer INC / Steel Products Fabrication | Tulsa | OK | — | ◇ UNVERIFIED |
| SSS & S Instalation INC Dba Pacific Stainless | Colton | CA | — | ◇ UNVERIFIED |
| SEStanford Energy Systems | San Francisco | CA | — | ◇ UNVERIFIED |
| SCSt Croix Genuine Stoves | Waco | NE | — | ◇ UNVERIFIED |
| SMStead Motors | Walnut Creek | CA | — | ◇ UNVERIFIED |
| SBSterling Boiler & Mechanical, INC. | Gallatin | TN | — | ◇ UNVERIFIED |
| SBSterling Boiler & Mechanical, INC. | Parrish | FL | — | ◇ UNVERIFIED |