Springfield Climate Zone & Energy Code

Climate Zone: IECC Climate Zone 5A (cold-humid). Springfield's central Illinois position produces hot, humid summers (93°F/75°F cooling design) and cold winters (-4°F heating design). Agricultural heartland weather variability is significant — temperature swings and severe weather events are common.

Energy Code & Manual J Requirement: Illinois IECC 2024. ACCA Manual J required for residential HVAC permits in Sangamon County and Springfield city jurisdictions.

Local Electric Utility: Ameren Illinois

Building Department: City of Springfield Office of Public Works – Building & Zoning

Local Trade Association: ACCA Illinois Chapter