HVAC Permits in Illinois

Complete guide to HVAC permit requirements, energy code compliance, and building department information for contractors working in Illinois.

99
Major Cities
1,293
ZIP Codes
2021 IECC
Energy Code
2
Climate Zones

Illinois Energy Code Requirements

Understanding the energy efficiency standards that govern HVAC installations in Illinois

Current Energy Code

2021 IECC

Current Standard

Statewide energy efficiency requirements for HVAC systems, equipment, and building envelope performance.

Common Requirements

Manual J load calculations
Equipment efficiency ratings
Duct system design
Building envelope compliance

Important Note

Local jurisdictions may have additional requirements beyond the state energy code. Always verify specific compliance needs with your local building department.

HVAC Permits by City in Illinois

Cook

Zone 5A

Cook County • 102 ZIP codes

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Chicago

Zone 5A

Cook County • 81 ZIP codes

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DuPage

Zone 5A

DuPage County • 32 ZIP codes

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Champaign

Zone 5A

Champaign County • 29 ZIP codes

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Lake

Zone 5A

Lake County • 28 ZIP codes

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Madison

Zone 4A

Madison County • 27 ZIP codes

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St. Clair

Zone 4A

St. Clair County • 26 ZIP codes

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McLean

Zone 5A

McLean County • 25 ZIP codes

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Williamson

Zone 5A

Williamson County • 24 ZIP codes

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Vermilion

Zone 5A

Vermilion County • 24 ZIP codes

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Bureau

Zone 5A

Bureau County • 24 ZIP codes

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Sangamon

Zone 5A

Sangamon County • 23 ZIP codes

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Peoria

Zone 5A

Peoria County • 22 ZIP codes

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Iroquois

Zone 5A

Iroquois County • 21 ZIP codes

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Macoupin

Zone 4A

Macoupin County • 20 ZIP codes

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Kane

Zone 5A

Kane County • 18 ZIP codes

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Fulton

Zone 5A

Fulton County • 18 ZIP codes

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McHenry

Zone 5A

McHenry County • 17 ZIP codes

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Livingston

Zone 5A

Livingston County • 17 ZIP codes

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Rock Island

Zone 5A

Rock Island County • 16 ZIP codes

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Knox

Zone 5A

Knox County • 16 ZIP codes

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Macon

Zone 5A

Macon County • 16 ZIP codes

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Montgomery

Zone 4A

Montgomery County • 16 ZIP codes

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Ogle

Zone 5A

Ogle County • 15 ZIP codes

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Kankakee

Zone 5A

Kankakee County • 15 ZIP codes

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Hancock

Zone 5A

Hancock County • 15 ZIP codes

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Tazewell

Zone 5A

Tazewell County • 15 ZIP codes

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Adams

Zone 5A

Adams County • 15 ZIP codes

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Pike

Zone 5A

Pike County • 15 ZIP codes

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Franklin

Zone 4A

Franklin County • 15 ZIP codes

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Rockford

Zone 5A

Winnebago County • 14 ZIP codes

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Lee

Zone 5A

Lee County • 14 ZIP codes

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Randolph

Zone 4A

Randolph County • 14 ZIP codes

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DeKalb

Zone 5A

DeKalb County • 13 ZIP codes

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Stephenson

Zone 5A

Stephenson County • 13 ZIP codes

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Logan

Zone 5A

Logan County • 13 ZIP codes

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Shelby

Zone 4A

Shelby County • 13 ZIP codes

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Christian

Zone 4A

Christian County • 13 ZIP codes

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Jackson

Zone 4A

Jackson County • 13 ZIP codes

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Whiteside

Zone 5A

Whiteside County • 12 ZIP codes

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Wayne

Zone 4A

Wayne County • 12 ZIP codes

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Mercer

Zone 5A

Mercer County • 11 ZIP codes

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McDonough

Zone 5A

McDonough County • 11 ZIP codes

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Clinton

Zone 4A

Clinton County • 11 ZIP codes

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Marion

Zone 4A

Marion County • 11 ZIP codes

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Jefferson

Zone 4A

Jefferson County • 11 ZIP codes

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Winnebago

Zone 5A

Winnebago County • 10 ZIP codes

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Piatt

Zone 5A

Piatt County • 10 ZIP codes

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Fayette

Zone 4A

Fayette County • 10 ZIP codes

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Washington

Zone 4A

Washington County • 10 ZIP codes

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Grundy

Zone 5A

Grundy County • 9 ZIP codes

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Woodford

Zone 5A

Woodford County • 9 ZIP codes

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Jo Daviess

Zone 5A

Jo Daviess County • 9 ZIP codes

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Warren

Zone 5A

Warren County • 9 ZIP codes

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Mason

Zone 5A

Mason County • 9 ZIP codes

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Douglas

Zone 5A

Douglas County • 9 ZIP codes

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Greene

Zone 5A

Greene County • 9 ZIP codes

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Morgan

Zone 5A

Morgan County • 9 ZIP codes

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Aurora

Zone 5A

Kane County • 8 ZIP codes

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Marshall

Zone 5A

Marshall County • 8 ZIP codes

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Henderson

Zone 5A

Henderson County • 8 ZIP codes

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Calhoun

Zone 5A

Calhoun County • 8 ZIP codes

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Effingham

Zone 4A

Effingham County • 8 ZIP codes

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Johnson

Zone 4A

Johnson County • 8 ZIP codes

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Pulaski

Zone 4A

Pulaski County • 8 ZIP codes

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Kendall

Zone 5A

Kendall County • 7 ZIP codes

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Carroll

Zone 5A

Carroll County • 7 ZIP codes

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Putnam

Zone 5A

Putnam County • 7 ZIP codes

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Edgar

Zone 5A

Edgar County • 7 ZIP codes

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Bond

Zone 4A

Bond County • 7 ZIP codes

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Jasper

Zone 4A

Jasper County • 7 ZIP codes

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Alexander

Zone 4A

Alexander County • 7 ZIP codes

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Stark

Zone 5A

Stark County • 6 ZIP codes

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Schuyler

Zone 5A

Schuyler County • 6 ZIP codes

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Coles

Zone 5A

Coles County • 6 ZIP codes

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Jersey

Zone 5A

Jersey County • 6 ZIP codes

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Richland

Zone 4A

Richland County • 6 ZIP codes

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Clark

Zone 5A

Clark County • 6 ZIP codes

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Cumberland

Zone 5A

Cumberland County • 6 ZIP codes

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Clay

Zone 4A

Clay County • 6 ZIP codes

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Gallatin

Zone 4A

Gallatin County • 6 ZIP codes

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Union

Zone 4A

Union County • 6 ZIP codes

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Saline

Zone 4A

Saline County • 6 ZIP codes

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Boone

Zone 5A

Boone County • 5 ZIP codes

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Moultrie

Zone 5A

Moultrie County • 5 ZIP codes

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Monroe

Zone 4A

Monroe County • 5 ZIP codes

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Perry

Zone 4A

Perry County • 5 ZIP codes

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Cass

Zone 5A

Cass County • 5 ZIP codes

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Menard

Zone 5A

Menard County • 5 ZIP codes

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Wabash

Zone 4A

Wabash County • 4 ZIP codes

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Lawrence

Zone 4A

Lawrence County • 4 ZIP codes

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Edwards

Zone 4A

Edwards County • 4 ZIP codes

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Scott

Zone 5A

Scott County • 4 ZIP codes

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Hamilton

Zone 4A

Hamilton County • 4 ZIP codes

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Massac

Zone 4A

Massac County • 4 ZIP codes

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Hardin

Zone 4A

Hardin County • 4 ZIP codes

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Brown

Zone 5A

Brown County • 3 ZIP codes

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Pope

Zone 4A

Pope County • 2 ZIP codes

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LaSalle

Zone 5A

LaSalle County • 1 ZIP codes

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Need Professional Load Calculations?

Ensure your HVAC system meets all code requirements in Illinois

✅ Manual J load calculation
✅ Equipment sizing recommendations
✅ Energy code compliance verification
✅ Professional report ready for permits
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Frequently Asked Questions

Everything you need to know about HVAC permits and energy code compliance in Illinois

1What energy code does Illinois follow?

Illinois follows the 2021 IECC for energy efficiency requirements. This includes specific standards for HVAC equipment efficiency, duct design, and building envelope performance.

2Are Manual J calculations required in Illinois?

Most jurisdictions in Illinois require Manual J load calculations for proper HVAC system sizing. Our free load calculation tool can generate the professional reports you need for permits.

3How long does it take to get HVAC permits in Illinois?

Permit processing times vary by jurisdiction, typically ranging from 1-3 weeks. Having complete documentation including load calculations can speed up the process. Check with your local building department for specific timeframes.

4Do I need different permits for different types of HVAC work?

Yes, permit requirements vary based on the scope of work. New installations typically require mechanical permits, while simple repairs may not need permits. Replacements usually require permits if there are changes to the system capacity or ductwork.

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Need Climate Zone Data for Illinois?

Get official IECC climate zone information, design temperatures, and R-value requirements for accurate Manual J calculations in Illinois.

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