| Business | Phone |
| Air Temp Mechanical Inc Merrillville 46410 | (219) 736-1150 |
| American Refrigeration Heating Merrillville 46410 | (219) 796-3380 |
| Arctic Engineering Co Inc 8410 Minnesota St, Merrillville 46410 | (219) 947-4999 |
| Earl's Heating & Air Cond Inc 8621 Indiana St, Merrillville 46410 | (219) 942-9023 |
| Kent Heating & Air Condition Merrillville 46410 | (219) 736-0300 |
| Lake Heating & Ventilating 16 E 66th Pl, Merrillville 46410 | (219) 769-8103 |
| Modern Heating Air Cond 5252 Washington St, Merrillville 46410 | (219) 887-1222 |
| Vercellino's Heating & Ac 5500 E 81st Ave # B, Merrillville 46410 | (219) 942-7637 |