| Business | Phone |
| Apex Radiant Heating Mount Vernon 98273 | (360) 336-1924 |
| Cem Heating Inc 1701 N 33rd Pl, Mount Vernon 98273 | (360) 661-1630 |
| Foss Heating & Cooling 333 E Blackburn Rd A, Mount Vernon 98273 | (360) 336-1517 |
| Handy's Heating Inc 17737 State Route 536, Mount Vernon 98273 | (360) 428-0969 |
| Pacific Heating & Air Mount Vernon 98273 | (360) 336-2200 |