IECC Climate Zone 3 — Warm | Builder's Knowledge Garden — Builder's Knowledge Garden
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IECC Climate Zone 3 — Warm
🌡️ Climate Zone
construction
IECC Climate Zone 3 — Warm
Updated Mar 26, 2026
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Mixed climate zone spanning mid-South, California coast, and parts of Southwest. Both heating and cooling significant. Code addresses both solar gain control and insulation levels.
TAGS
IECC
warm
mixed
California
Southeast
DETAILS
hdd range
3,000-4,000
iecc zone
3
example cities
Los Angeles, Atlanta, Dallas, Memphis, Las Vegas, Raleigh
roof insulation
R-38 to R-60
wall insulation
R-13+R-5ci or R-20+R-3ci
SOURCES
🔗
https://codes.iccsafe.org/content/IECC2021P1
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