Climate ZonesCaliforniaHumboldt

Humboldt, California HVAC Climate Zone

Humboldt is located in IECC Climate Zone 4C (Mixed - Marine). Get accurate Manual J load calculations with official design temperatures for Humboldt.

Climate Zone
4C
Winter Design
29°F
Summer Design
85°F
ZIP Codes
36

Humboldt HVAC Contractors: Get Your Free Manual J Report

Climate Zone 4C requires precise load calculations. Upload your Humboldt blueprint and get a professional Manual J report in 60 seconds— first report is FREE. Pre-loaded with Humboldt's exact design temperatures (29°F winter / 85°F summer).

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Verify Your Humboldt ZIP Code

Enter your ZIP code to confirm it's in Humboldt and get climate zone details.

Humboldt covers 36 ZIP codes: 95501, 95502, 95503, 95511, 95514, 95519, 95521, 95524, 95525, 95526 and 26 more

Humboldt Design Temperatures

Official ASHRAE design temperatures for Humboldt, used for accurate Manual J load calculations.

Winter 99% Design Temp
29°F
Summer 1% Design Temp
85°F
Summer Wet Bulb
67°F

IECC Requirements for Zone 4C

Minimum insulation and window requirements for Humboldt per IECC 2021.

Wall Insulation:R-20
Roof/Ceiling:R-49
Floor Insulation:R-19
Window U-Factor:0.32
Window SHGC:0.4

Energy Code: 2022 Title 24

Recommended HVAC Equipment for Humboldt

Heating Systems

Gas furnace
Heat pump
Typical AFUE
92-95%

Cooling Systems

AC (optional)
Heat pump
Typical SEER
14 SEER

Related Climate Zone Pages

Learn More About
Climate Zone 4C
View All Zones in
California
HVAC Permits for
Humboldt, California

Get Free Manual J Calculations for Humboldt

Upload your Humboldt blueprint and get a professional Manual J load calculation using official Zone 4C design temperatures. First report is FREE.

Humboldt design temps
Zone 4C compliant
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