| Business | Phone |
| Arrowhead Insulation Ltd 6420 Redruth St, Duluth 55807 | (218) 628-3938 |
| Horizon Insulation Inc 6521 Fredenberg Lake Rd, Duluth 55803 | (218) 721-3955 |
| North Star Insulating Inc 5454 N Tischer Rd, Duluth 55804 | (218) 525-4637 |
| Reeve Insulation 16 Kalmia Dr, Duluth 55810 | (218) 624-9075 |