| Business | Phone |
| Babcock & Wilcox Construction 3835 California Ave, Pittsburgh 15212 | (412) 366-3747 |
| Clayworth Mechanical Inc 26 S 27th St, Pittsburgh 15203 | (412) 381-8280 |
| Conditioned Air Inc 2238 Lynnbrook Ave, Pittsburgh 15226 | (412) 343-6110 |
| D Powell Inc 707 Delafield Rd, Pittsburgh 15215 | (412) 781-2121 |
| Dasco Inc 3005 Grand Ave, Pittsburgh 15225 | (412) 771-4140 |
| East West Manufacturer & Supply Co 1034 Peralta St, Pittsburgh 15212 | (412) 323-8180 |
| Hanula Mechanical & Gen Contr 2152 Hazeldell St, Pittsburgh 15210 | (412) 885-8080 |
| Huckestein Mechanical Svc Inc 200 Poplar St, Pittsburgh 15223 | (412) 781-5750 |
| Hyde 499 Melwood Ave, Pittsburgh 15213 | (412) 682-1200 |
| J B Mechanical 1522 Merrick Ave, Pittsburgh 15226 | (412) 341-0981 |
| Lakewood Mechanical Inc 4237 Campbells Run Rd, Pittsburgh 15205 | (412) 276-1929 |
| Limbach Constructors Inc 1 N Shore Ctr, Pittsburgh 15212 | (412) 359-2100 |
| Limbach Facility Svc 12 Federal St # 410, Pittsburgh 15212 | (412) 359-2200 |
| Linc Corp 4 N Shore Ctr, Pittsburgh 15212 | (412) 359-2197 |
| Lugaila Mechanical Inc 206 Silver Oak Dr, Pittsburgh 15220 | (412) 561-2429 |
| Lugaila Mechanical Inc 406 Parkway View Dr, Pittsburgh 15205 | (412) 788-4311 |
| Max Mechanical Llc 2121 Noblestown Rd, Pittsburgh 15205 | (412) 921-3600 |
| Mc Kamish 50 55th St, Pittsburgh 15201 | (412) 781-6262 |
| Phillips Mechanical Contr 120 Brighton Rd, Pittsburgh 15202 | (724) 846-8444 |
| Power Piping Co 436 Butler St, Pittsburgh 15223 | (412) 323-6200 |
| Sauer Inc 30 51st St, Pittsburgh 15201 | (412) 687-4100 |
| Wayne Crouse Inc 3370 Stafford St, Pittsburgh 15204 | (412) 771-5176 |
| Wheels Mechanical Cntrctng 610 Old Clairton Rd, Pittsburgh 15236 | (412) 653-5118 |
| Q-Dot Inc 3046 Penn Ave, Pittsburgh 15201 | (412) 471-6618 |
| R & B Mechanical Inc 116 National Dr, Pittsburgh 15236 | (412) 655-0147 |