San Antonio Climate Zone & Energy Code

Climate Zone: IECC Climate Zone 2A (hot-humid). San Antonio's south-central Texas position produces long, hot summers (99°F/74°F cooling design) with moderate humidity and brief, occasionally freezing winters (25°F heating design). Summer cooling dominates with meaningful but secondary heating loads.

Energy Code & Manual J Requirement: Texas Energy Code (IECC 2015, Texas modified). ACCA Manual J required for residential HVAC permits in Bexar County and all San Antonio area jurisdictions.

Local Electric Utility: CPS Energy (City Public Service, City-owned)

Building Department: City of San Antonio Development Services Department

Local Trade Association: ACCA Texas / ASHRAE San Antonio Chapter / SMACNA Texas