Columbia Climate Zone & Energy Code

Climate Zone: IECC Climate Zone 3A (mixed-humid). Columbia's inland location produces extreme summer heat (97°F/77°F cooling design) — one of the hottest cities in the Southeast. Winters are mild but genuine (24°F heating design).

Energy Code & Manual J Requirement: South Carolina Residential Energy Code (IECC 2009). ACCA Manual J required for all Richland and Lexington County HVAC permit applications.

Local Electric Utility: Dominion Energy South Carolina

Building Department: City of Columbia Building & Development Services

Local Trade Association: ACCA Carolina Chapter / ASHRAE Carolinas Chapter