Understanding Illinois HVAC regulatory oversight is essential for contractors, businesses, and homeowners navigating the state's energy landscape. Unlike most states, Illinois does not require statewide HVAC licensing, with regulations varying by municipality. This comprehensive guide covers everything you need to know about Illinois HVAC regulations heading into 2026.
The regulatory oversight framework in Illinois is unique because HVAC licensing requirements are set at the local level rather than statewide. Whether you're an HVAC contractor seeking to understand local requirements or a business evaluating Illinois' energy market, understanding these regulatory structures is critical for success.
Illinois Commerce Commission: Primary Regulatory Oversight
The Illinois Commerce Commission (ICC) serves as the primary regulatory body for Illinois' utilities. The ICC regulates electric, natural gas, water, and telecommunications utilities operating in the state.
The Illinois ICC consists of five commissioners appointed by the Governor with Senate consent. Commissioners serve five-year staggered terms. The ICC sets utility rates, ensures reliable service, and implements state energy policy.
Agency: Illinois Commerce Commission
Address: 527 East Capitol Avenue, Springfield, IL 62701
Phone: (217) 782-7295
Consumer Hotline: 1-800-524-0795
Website: https://www.icc.illinois.gov/
Illinois HVAC Licensing Requirements for 2026
Illinois does not have statewide HVAC licensing requirements. There is no state-level license issued for HVAC technicians or contractors. However, local municipalities may have their own licensing requirements, and federal EPA certification is required for refrigerant handling.
The Illinois Department of Financial and Professional Regulation (IDFPR) only licenses roofing contractors and plumbers at the state level. HVAC licensing is handled entirely by local jurisdictions.
Local HVAC Licensing Requirements
Chicago: Does not issue specific HVAC licenses. However, HVAC work requiring building permits may require a General Contractor license. Chicago has five classifications (A through E) based on project value:
Class A: Unlimited project value ($2,000 fee)
Class B: Up to $10,000,000 ($1,000 fee)
Class C: Up to $5,000,000 ($750 fee)
Class D: Up to $2,000,000 ($500 fee)
Class E: Up to $500,000 ($300 fee)
Springfield: Requires registration with the Building and Zoning Department, passing an exam, and proof of business insurance.
Evanston: Requires passing the International Mechanical & Fuel Gas Codes exam ($100, open-book).
Elgin: Requires passing a Department of Community Development exam (up to 4 hours, $100).
Rock Island: Requires passing Prometric exams (75% to pass).
Aurora: HVAC contractors must pass a licensing exam and provide proof of general liability and workers' compensation insurance plus a $5,000 surety bond.
Federal Requirements
Regardless of local licensing, EPA Section 608 Certification is required by federal law for anyone who maintains, services, repairs, or disposes of equipment that could release refrigerants. This applies to all HVAC technicians in Illinois.
EPA Section 608 Certification types: Type I (small appliances), Type II (high-pressure systems), Type III (low-pressure systems), Universal (all systems).
HVAC License Fees and Insurance Requirements
Fees vary by municipality. Chicago General Contractor license insurance requirements:
Class A: $5 million per occurrence
Class B: $3 million per occurrence
Class C: $1 million per occurrence, $2 million aggregate
Class D: $1 million per occurrence, $2 million aggregate
Class E: $1 million per occurrence
Workers' compensation insurance is required for contractors with employees throughout Illinois.
Agency: Illinois Dept. of Financial and Professional Regulation (state licensing)
Phone: (888) 473-4858
Website: https://idfpr.illinois.gov/
Reciprocal HVAC Licensing Agreements
Because Illinois does not have statewide HVAC licensing, there are no state-level reciprocity agreements. Each municipality sets its own requirements for out-of-area contractors.
Directory of Illinois Electric Companies
Illinois Investor-Owned Utilities
| Company Name | Website | Utility Type |
|---|---|---|
| Commonwealth Edison (ComEd) | comed.com | Investor-Owned |
| Ameren Illinois | ameren.com | Investor-Owned |
| MidAmerican Energy | midamericanenergy.com | Investor-Owned |
Illinois Electric Cooperatives
| Company Name | Website | Utility Type |
|---|---|---|
| Association of Illinois Electric Cooperatives | aiec.coop | Cooperative Association |
| Corn Belt Energy | cornbeltenergy.com | Cooperative |
| Eastern Illini Electric Cooperative | eiec.coop | Cooperative |
| Jo-Carroll Energy | jocarroll.com | Cooperative |
| Shelby Electric Cooperative | shelbyelectric.coop | Cooperative |
| Menard Electric Cooperative | menard.com | Cooperative |
Illinois Municipal Utilities
| Company Name | Website | Utility Type |
|---|---|---|
| Illinois Municipal Electric Agency | imea.org | Municipal Association |
| City of Springfield (CWLP) | cwlp.com | Municipal |
| Naperville Electric Utility | naperville.il.us | Municipal |
| Rochelle Municipal Utilities | rfrmu.com | Municipal |
