| Business | Phone |
| Brinkmann Heating & Cooling 6414 Northbrook Dr, Waterloo 62298 | (618) 939-5950 |
| Davis Heating & Cooling 5833 Grandview Ter, Waterloo 62298 | (618) 939-3487 |
| Emergency Heating & Air Cond Waterloo 62298 | (618) 939-5450 |
| Mighty Duck Enterprises Inc 411 W 3rd St, Waterloo 62298 | (618) 939-7117 |
| Jaenke Heating & Air Condition 301 Adams Dr, Waterloo 62298 | (618) 939-8029 |
| Jerry Miller Refrig Htg & Ac 221 W Mill St A, Waterloo 62298 | (618) 939-8594 |
| Mid County Svc 6760 David Scott Dr, Waterloo 62298 | (618) 939-7952 |
| Pour Refrigeration Co 7972 Gall Rd, Waterloo 62298 | (618) 939-7652 |