| Business | Phone |
| Dennis S Aasen Heating & Air 602 E Union St, Oconomowoc 53066 | (262) 567-7480 |
| Gnomes Hvac Oconomowoc 53066 | (262) 567-1054 |
| Hanson Heating Llc N67w33880 Loghouse Ct, Oconomowoc 53066 | (262) 966-4952 |
| Jack's Heating & Air Cond Oconomowoc 53066 | (262) 567-9745 |
| Klaty's Geothermal Specialist 529 Greenland Ave, Oconomowoc 53066 | (262) 490-1847 |