IECC Climate Zone 1 — Very Hot-Humid

Updated Mar 26, 2026

Warmest US climate zone including Hawaii, south Florida, south Texas, Puerto Rico, and US Virgin Islands. Cooling-dominated. Code focus: window SHGC limits, cool roofs, duct sealing, and vapor retarder placement (exterior side).

TAGS

IECC hot-humid cooling Florida Hawaii

DETAILS

hdd range

<2,000

iecc zone

cooling focus

Primary

example cities

Miami, Honolulu, Key West, San Juan

roof insulation

R-30 to R-49

wall insulation

R-13 or R-20ci

SOURCES

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

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