| Business | Phone |
| Wilson Fire Equipment & Svc Co 7303 Empire Central Dr, Houston 77040 | (713) 896-4747 |
| A Team Security Svc 8419 Hearth Dr, Houston 77054 | (713) 533-1446 |
| American Alarm Co 6200 Stillman St, Houston 77007 | (713) 869-3721 |
| Api Systems Group Houston 77092 | (713) 681-0177 |
| B G Systems 6415 Calle Lozano Dr, Houston 77041 | (713) 466-5151 |
| Cardinal Fire Protection 1635 Moritz Dr, Houston 77055 | (713) 973-0825 |
| Casteel Automatic Fire Prtctn 2836 Delafield St, Houston 77023 | (713) 921-5333 |
| Classic Protection Systems Inc 1648 W Sam Houston Pkwy N, Houston 77043 | (713) 468-3573 |
| Commercial Facility Systems 7411 Sunlight Ln, Houston 77095 | (281) 463-2108 |
| Convergint Technologies 440 Benmar Dr, Houston 77060 | (281) 999-4499 |
| D Square Systems 9125 Grannis St, Houston 77075 | (713) 692-3473 |
| Engineered Protection Systems 2022 Bissonnet St, Houston 77005 | (713) 529-0891 |
| Eps Security 1110 N Post Oak Rd, Houston 77055 | (713) 432-0660 |
| Fire Safe Protection Svc 1815 Sherwood Forest St, Houston 77043 | (713) 722-7800 |
| Fireguard-Fire Protection Svc 1919 W Sam Houston Pkwy N, Houston 77043 | (713) 780-8084 |
| Hitech Fire Detection 4355 Sylvanfield Dr, Houston 77014 | (281) 970-9000 |
| Koetter Fire Protection 3005 Bellfort St, Houston 77051 | (713) 733-6888 |
| Network Security Corp 3415 Mercer St, Houston 77027 | (713) 623-4733 |