| Business | Phone |
| Abrahamson Heating Duluth 55807 | (218) 624-3605 |
| Arbour Heating & Cooling 2241 Heather Ave, Duluth 55803 | (218) 525-1479 |
| Central Heating & Air Cond Inc 2114 W 3rd St, Duluth 55806 | (218) 720-4657 |
| Cooke Heating & Ventilation 5875 Old Miller Trunk Hwy, Duluth 55811 | (218) 722-6159 |
| D G Solem & Sons 5845 Jean Duluth Rd, Duluth 55803 | (218) 525-3123 |
| General Heating & Mechanical 1922 W Superior St, Duluth 55806 | (218) 727-1888 |
| Krause Sheet Metal & Heating 2020 W 1st St, Duluth 55806 | (218) 722-6354 |