Cary Climate Zone & Energy Code

Climate Zone: IECC Climate Zone 3A (mixed-humid). Cary shares Raleigh's Piedmont NC climate — 21°F heating design and 93°F/76°F cooling design. Hot, humid summers with significant latent loads and moderately cold winters require four-season HVAC design.

Energy Code & Manual J Requirement: North Carolina Energy Code (IECC 2015). ACCA Manual J required for residential HVAC permits in Wake County and Cary jurisdictions.

Local Electric Utility: Duke Energy Progress

Building Department: Town of Cary Development Services

Local Trade Association: ACCA Carolina Chapter / ASHRAE Carolinas Chapter