| Business | Phone |
| Cti Mechanical 8622 Louisiana Pl, Merrillville 46410 | (219) 756-5100 |
| Eibel & Son Mechanical Inc Merrillville 46410 | (219) 762-2714 |
| International Piping Systems 8619 Louisiana Pl, Merrillville 46410 | (219) 756-7720 |
| K & M Mechanical Inc 8623 Louisiana Pl, Merrillville 46410 | (219) 791-0507 |