| Business | Phone |
| All Zone W5422 Amy Ave, Appleton 54915 | (920) 731-1350 |
| Blount Heating & Air Cond 507 W Wisconsin Ave, Appleton 54911 | (920) 739-4551 |
| Bob's Quality Heating & Air Appleton 54911 | (920) 731-6744 |
| Boucher's Heating & Cooling 724 W Frances St, Appleton 54914 | (920) 734-8672 |
| C & S Heating & Air Cond Llc N3614 French Rd, Appleton 54913 | (920) 832-9829 |
| Christensen & Wisnet Inc 702 S Outagamie St, Appleton 54914 | (920) 734-1436 |
| Christensen Heating & Ac Inc 1609 W Wisconsin Ave, Appleton 54914 | (920) 731-3002 |
| Cliff & Al's Heating Svc Co 510 W Foster St, Appleton 54915 | (920) 733-1112 |
| Cliff's Heating Svc N3639 County Road Ee, Appleton 54913 | (920) 734-1732 |
| Custom Comfort Heating & Clng 400 W Northland Ave, Appleton 54911 | (920) 832-4005 |
| Efficiency Co 1002 Randolph Dr, Appleton 54913 | (920) 731-9411 |
| Four Seasons Heating & Cooling 711 W Deerview Dr, Appleton 54913 | (920) 832-1462 |
| Gilbert Heating Co Inc 107 N Douglas St, Appleton 54914 | (920) 733-1947 |
| Haak Heating Inc 1824 N Locust St, Appleton 54914 | (920) 734-6937 |
| Northern Heating N3633 County Rd E, Appleton 54913 | (920) 788-2658 |
| Valheat Inc 107 N Douglas St, Appleton 54914 | (920) 733-9071 |