| Business | Phone |
| Alc Controls Inc 307 Pomona Dr # A, Greensboro 27407 | (336) 273-8450 |
| Yamas Control Carolinas Inc 206 Atwell Ave, Greensboro 27406 | (336) 691-1818 |
| Conservatrol Corp 107 Creek Ridge Rd # 21, Greensboro 27406 | (336) 370-0644 |
| Control Systems Corp 119 Longale Rd, Greensboro 27409 | (336) 855-8340 |
| Siemens Building Technologies 2641 Randleman Rd # B, Greensboro 27406 | (336) 691-0740 |