Aurora Climate Zone & Energy Code

Climate Zone: IECC Climate Zone 5A (cold-humid). Aurora's western Chicago suburb location is slightly more continental than lakefront Chicago — marginally colder winters and warmer summers due to reduced Lake Michigan influence.

Energy Code & Manual J Requirement: Illinois Energy Conservation Code (IECC 2024). ACCA Manual J required for residential HVAC permits. DuPage County and Kane County municipalities administer permits locally.

Local Electric Utility: ComEd (Commonwealth Edison / Exelon)

Building Department: City of Aurora Building Department

Local Trade Association: ACCA Illinois Chapter / ASHRAE Illinois Chapter