| Performance Plumbing And Heating, Inc. | Medway | MA | Subcontractor |
| Performance Testing And Balancing LLC | Southampton | MA | $0 |
| Perkins Climate Control Inc. | Leesville | LA | $0 |
| Perry Aire Services Inc. | Arlington | VA | $0 |
| Peterson Mechanical, Inc. | Sonoma | CA | Subcontractor |
| Peterson Refrigeration & Ac Inc. | Kane | PA | $0 |
| Petro Spect Industrial Services, Inc. | Beaumont | TX | $0 |
| Pha, Inc. | Hayes | VA | $0 |
| Philos Mechanical LLC | Prior Lake | MN | $0 |
| Phoenix Fire Systems, LLC | Frankfort | IL | Subcontractor |
| Pilar Services Inc. | Doral | FL | $0 |
| Pine Hollow Mechanical Inc. | Uniontown | PA | $0 |
| Pinnacle Mechanical Inc. | Anchorage | AK | $0 |
| Pipers Mechanical Inc. | Middleton | WI | $0 |
| Pipe Trades | San Diego | CA | Subcontractor |
| Piping Contractors Of Kansas Inc. | Topeka | KS | Subcontractor |
| Pk Welding, L.L.C. | Linden | NJ | $0 |
| Platinum Mechanical, LLC | Tulsa | OK | Subcontractor |
| Pleune Service Company | Grand Rapids | MI | $0 |
| Plumbingdane, Inc. | West Sacramento | CA | Subcontractor |
| Pm Contracting, Inc. | Grandview | MO | Subcontractor |
| P & M Mechanical Inc. | Birmingham | AL | $0 |
| Polar Cooling LLC | Yuma | AZ | Subcontractor |
| Polaris Trading Inc. | Hebron | KY | Subcontractor |
| Polson & Grady Ltd. | Alamogordo | NM | Subcontractor |
| Potomac Mechanical Contractors, Inc. | Gaithersburg | MD | $0 |
| Power And Combustion, Incorporated | Rosedale | MD | Subcontractor |
| Power Vac America, Inc. | Houston | TX | Subcontractor |
| Pow/r/save, Inc. | Cedar Grove | NJ | $0 |
| Precise Air Systems, Inc. | Los Angeles | CA | $0 |
| Precision Air Conditioning Of Brevard, Inc. | Cocoa | FL | Subcontractor |
| Precision Balance, Inc. | Key West | FL | Subcontractor |
| Precision Mechanical Contractors, Inc. | Fort Wayne | IN | $0 |
| Precision Plumbing Ct LLC | Southbury | CT | $0 |
| Precision Plumbing & Heating, Inc. | Billings | MT | Subcontractor |
| Precision Test & Balance, Inc. | Colorado Springs | CO | Subcontractor |
| Preferred Mechanical LLC | Honolulu | HI | $0 |
| Premier Fire Protection, Inc. | Loveland | CO | Subcontractor |
| Premier Mechanical, Inc. | Addison | IL | Subcontractor |
| Prestige Plumbing & Heating Inc. | Staten Island | NY | Subcontractor |
| Proactive Fire Protection LLC | Pensacola | FL | Subcontractor |
| Pro-air Services, Inc. | Decatur | AL | $0 |
| Professional Cooling And Control Systems, Inc. | Middleburg | FL | Subcontractor |
| Professional Fire Extinguishers Sales & Service, Inc. | Ashland | KY | $0 |
| Protech Fire Inc. | Gainesville | GA | Subcontractor |
| Pro Tech Mechanical, LLC | Corpus Christi | TX | Subcontractor |
| Prout Boiler Heating And Welding Inc. | Youngstown | OH | $0 |
| Pr Plumbing, Heating & Air Conditioning, Inc. | Fresno | CA | $0 |
| PSF Mechanical Inc. | Fife | WA | Subcontractor |
| P & S Refrigeration LLC | Kaunakakai | HI | $0 |
| Pumps, Blowers & Electric Motors, LLC | Durham | NC | $0 |
| Purvis & Foster, Inc. | Detroit | MI | $0 |
| Pyles Hvac LLC | Kansas City | MO | $0 |
| Qannex Corp. | El Paso | TX | Subcontractor |
| Qualified Plumbing, Inc. | Keaau | HI | $0 |
| Quality Air Heating & Cooling, Inc. | Grand Rapids | MI | $0 |
| Quality Mechanical Services Inc. | Verona | PA | $0 |
| Quality Plumbing & Heating Inc. | Kokomo | IN | Subcontractor |
| Quick Servant Company, Inc. | Columbia | MD | $0 |
| Ramos Refrigeration & Ac, LLC | Kingsville | TX | $0 |
| R A M S Mechanical Inc. | Brooklyn | NY | Subcontractor |
| Randy's Air Conditioning, Inc. | Summit | MS | $0 |
| Ranger Plumbing & Heating, Inc. | Bozeman | MT | $0 |
| Rapid Fire Fabrication And Supply, Inc. | San Diego | CA | Subcontractor |
| Rawlings Mechanical Corp. | Sun Valley | CA | Subcontractor |
| Ray And Son Heating And Air Conditioning, Inc. | Nashville | GA | Subcontractor |
| Ray C. Weaver, Mechanical Contractors, Inc. | Gulfport | MS | Subcontractor |
| Ray Mac Mechanical Inc. | Mount Shasta | CA | $0 |
| Ray Palmer Associates Inc. | Dover | NJ | Subcontractor |
| R. B. Spencer, Inc. | Yuba City | CA | Subcontractor |
| Rc Mechanical Inc. | Hancock | MI | $0 |
| Rc Testing Service Corp. | Lynbrook | NY | $0 |
| R.D.C. Plumbing Services, LLC | Mount Airy | MD | Subcontractor |
| R & D Heating & Cooling Inc. | Lewistown | MT | $0 |
| RDL Inc. | Stockton | CA | $0 |
| Rec Industries Inc. | College Station | TX | Subcontractor |
| Redd Mechanical, Inc. | Blanding | UT | $0 |
| Redinger Heating & Cooling | Moscow | ID | $0 |
| Reinhardt Refrigeration, Inc. | Duchesne | UT | $0 |
| Reliable Plant Maintenance, Inc. | Mckinney | TX | Subcontractor |
| Remco, Inc. | Mechanicsburg | PA | Subcontractor |
| Remigio R Tanglao | Dededo | GU | $0 |
| Renick Brothers Construction Co. | Slippery Rock | PA | Subcontractor |
| RGB Mechanical Contractors Inc. | Jonesboro | AR | $0 |
| Richard A. Benson Plumbing, Inc. | Oceano | CA | $0 |
| Richard Garr Mechanical Service, Inc. | Apple Valley | CA | $0 |
| Richard R Paul | Leitchfield | KY | $0 |
| Richards Plumbing And Heating Co. Inc. | Brooklyn | NY | $0 |
| Rieck Construction LLC | Dayton | OH | Subcontractor |
| Rieck Services, LLC | Dayton | OH | Subcontractor |
| Riggs Plumbing & Heating LLC | Narrowsburg | NY | Subcontractor |
| Rigney Plumbing, Inc. | Petaluma | CA | $0 |
| Rio Grande Heating & Cooling LLC | Eagle Pass | TX | $0 |
| Rite-way Plumbing & Heating Inc. | Grand Rapids | MI | $0 |
| River Mechanical Inc. | Glenolden | PA | $0 |
| Riverside Plumbing & Heating, Inc. | Moab | UT | $0 |
| Rj Mechanical Inc. | Vestavia | AL | Subcontractor |
| RJM Solutions, Inc. | Spring Hill | FL | $0 |
| Rk Industries Nm, LLC | Albuquerque | NM | Subcontractor |
| Rk Mechanical, LLC | Denver | CO | Subcontractor |
