| Business | Phone |
| Westbock Co 121 Ontario St, Frankfort 60423 | (815) 464-6222 |
| Lakeside Mechanical Inc 408 Center Rd, Frankfort 60423 | (815) 806-1734 |
| Northwoods Inc 408 Center Rd, Frankfort 60423 | (815) 806-1940 |
| M C Mechanical Contractors 22724 S La Grange Rd, Frankfort 60423 | (815) 806-1717 |