Little Rock Climate Zone & Energy Code

Climate Zone: IECC Climate Zone 3A (mixed-humid). Little Rock experiences very hot and humid summers with 99°F cooling design and a meaningful 77°F wet-bulb, indicating significant latent loads. Winters are variable with a 20°F heating design accounting for periodic hard freezes.

Energy Code & Manual J Requirement: Arkansas residential energy code is based on IECC 2009 with Arkansas amendments — one of the older energy code baselines in the US. ACCA Manual J is required for HVAC permit applications across most Arkansas jurisdictions. Confirm requirements with the specific AHJ, as local amendments vary.

Local Electric Utility: Entergy Arkansas

Building Department: City of Little Rock Planning & Development Department

Local Trade Association: PHCC Arkansas / ASHRAE Arkansas Chapter