IECC Climate Zone 2 — Hot

Updated Mar 26, 2026

Hot climate covering Gulf Coast, south/central Texas, Arizona, parts of California. Significant cooling load with some heating. Code balances SHGC for solar gain control with envelope insulation.

TAGS

IECC hot Gulf-Coast Arizona Texas

DETAILS

hdd range

2,000-3,000

iecc zone

example cities

Houston, Phoenix, Austin, New Orleans, Jacksonville

roof insulation

R-38 to R-60

wall insulation

R-13+R-5ci or R-20ci

SOURCES

🔗https://codes.iccsafe.org/content/IECC2021P1

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