| Business | Phone |
| Greenbriar Mechanical Systems 1414 Greenbriar Ln, Darien 60561 | (630) 969-9431 |
| Merit Mechanical Systems 1535 S Frontage Rd, Darien 60561 | (630) 910-5000 |
| Mid-State Power Rodding Corp 9213 Waterfall Glen Blvd, Darien 60561 | (630) 850-7902 |
| Midwest Electric & Appliance 305 Plainfield Rd, Darien 60561 | (630) 794-5600 |
| Water Heaters Only Inc 1001 S Frontage Rd, Darien 60561 | (630) 628-0308 |
| Wiltjer Plumbing Inc 8400 Wilmette Ave A, Darien 60561 | (630) 852-2939 |