Peoria Climate Zone & Energy Code

Climate Zone: IECC Climate Zone 5A (cold-humid). Peoria's inland central Illinois position produces the area's coldest major city heating design (-7°F) — colder than Chicago due to the absence of Lake Michigan's moderating effect. Hot, humid summers with Illinois River valley moisture influence create significant cooling and latent loads.

Energy Code & Manual J Requirement: Illinois IECC 2024. ACCA Manual J required for residential HVAC permits in Peoria County and all Peoria area jurisdictions.

Local Electric Utility: Ameren Illinois

Building Department: City of Peoria Development Services Department

Local Trade Association: ACCA Illinois Chapter / ASHRAE Illinois Chapter