Illinois climate & load drivers
- IECC climate zone: 4A-5A
- Annual load split: Heating-dominant — annual heating load exceeds cooling load (6,300 HDD / 1,100 CDD)
- Dominant heating fuel: Natural gas — piped utility supply through state pipeline network
- Dominant cooling system: Central air conditioning paired with separate heating equipment
Illinois licensing & permits
- License status: Statewide registration required (no exam)
- License board: Illinois — no statewide HVAC license; Chicago, Cook County, Naperville require municipal HVAC contractor registration with separate exams (official site)
- Permit: city or county mechanical permit required
How HVAC replacement costs vary in Illinois
State-specific code or insurance rule: Illinois Public Act 102-0662 (Climate and Equitable Jobs Act, 2021) targets 100% carbon-free electricity by 2050 and directs ComEd, Ameren, and Nicor Gas to fund residential heat pump rebates of $1,000–$1,500 per ton plus low-income equity adders — the most aggressive utility HP push in the Midwest.
Cities in Illinois
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