| Business | Phone |
| A & B Heating & Air Cond Inc 606 Mineral Springs Rd, Mchenry 60051 | (815) 344-0356 |
| Universal Systems 906 Steuben Rd, Mchenry 60051 | (815) 344-9100 |
| Comfort Air Heating & Cooling Inc. 4111 Wonder Lake Rd, Mchenry 60097 | (815) 459-2700 |
| Comfort Doctors 2020 Johnsburg Rd, Mchenry 60050 | (815) 363-1200 |
| Comfort Services 2942 Shorewood Dr, Mchenry 60050 | (815) 385-0700 |
| Service Systems Mechanical 7206 Stonewier Pt, Mchenry 60050 | (815) 344-3067 |
| Dieterich's Heating Cooling 1110 Goodview Ave, Mchenry 60051 | (815) 363-1506 |
| Official Heating & Cooling Inc 1401 North Dr, Mchenry 60050 | (815) 344-0400 |