| Business | Phone |
| Amcon Controls Inc 11906 Warfield St, San Antonio 78216 | (210) 349-6161 |
| Entech Sales N' Svc 2516 Freedom St, San Antonio 78217 | (210) 824-4587 |
| Nighthawk Systems Inc 10715 Gulfdale 200, San Antonio 78216 | (210) 341-4811 |
| Process Measurement & Control 6323 Sovereign St, San Antonio 78229 | (210) 308-8963 |
| San Antonio Control Systems 401 Isom Rd 420, San Antonio 78216 | (210) 341-1984 |
| South Texas Controls Inc 1405 N Flores St, San Antonio 78212 | (210) 527-9730 |
| Baro Controls Inc 5314 Las Campanas St, San Antonio 78233 | (210) 828-0480 |
| Davis Power Hydraulics 3534 Copeland, San Antonio 78219 | (210) 662-7411 |
| System Controls Instrument 11218 Ih 10 E, San Antonio 78244 | (210) 666-8628 |
| M & S Refrigeration Systems 15726 Shell Creek St, San Antonio 78232 | (210) 967-9615 |
| Siemens Building Svc 12001 Network Blvd, San Antonio 78249 | (210) 253-2700 |
| Siemens Building Technologies 12001 Network Blvd 318, San Antonio 78249 | (210) 641-2921 |
| Wilson-Mohr 4538 Centerview, San Antonio 78228 | (210) 735-3318 |