| Business | Phone |
| Four Seasons Heating 9503 Gulfstream Rd 1, Frankfort 60423 | (708) 748-1044 |
| Air-Ease Heating & Cooling Frankfort 60423 | (815) 469-6330 |
| Artisan Heating & Cooling 101 Ontario St, Frankfort 60423 | (815) 469-1515 |
| Suburban Electric Frankfort 60423 | (815) 469-9090 |
| C & J Heating & Cooling Frankfort 60423 | (815) 469-8844 |
| D & T Svc Po Box 1059, Frankfort 60423 | (815) 485-7400 |
| Frankfort Residential 721 Indiana Ct, Frankfort 60423 | (815) 469-4200 |
| Heating & Cooling Mart 754 Center Rd, Frankfort 60423 | (815) 464-1665 |
| Rivard Refrigeration 10053 W Kuse Rd, Frankfort 60423 | (815) 469-9395 |
| Quality 1 Heating & Cooling 9227 Gulfstream Rd, Frankfort 60423 | (815) 464-9636 |