| Business | Phone |
| Air Tech Heating Inc 1305 Industrial Pkwy A1, Fond Du Lac 54937 | (920) 924-6742 |
| Fondy Heating & Air Cond 809 Wisconsin Ave, Fond Du Lac 54937 | (920) 922-4565 |
| Sure Fire 19 W Pioneer Rd, Fond Du Lac 54935 | (920) 922-4477 |
| Ziegelbauer Sheet Metal & Htg 136 S Brooke St, Fond Du Lac 54935 | (920) 922-4770 |