| Business | Phone |
| Arctic Mechanical Inc 5385 N Shore Dr, Duluth 55804 | (218) 525-5433 |
| Arrowhead Refrigeration 4701 Mike Colalillo Dr, Duluth 55807 | (218) 628-3624 |
| Blesener Heating & Air Cond 4085 E Calvary Rd, Duluth 55803 | (218) 728-2339 |
| Carlson Refrigeration & Hvac Duluth 55802 | (218) 722-8038 |
| Ellis Quality Air & Heating 7211 Rice Lake Rd, Duluth 55803 | (218) 724-2530 |
| Northstar Heating & Cooling 225 S Central Ave, Duluth 55807 | (218) 628-9276 |