Climate ZonesCaliforniaAlameda

Alameda, California HVAC Climate Zone

Alameda is located in IECC Climate Zone 3C (Warm - Marine). Get accurate Manual J load calculations with official design temperatures for Alameda.

Climate Zone
3C
Winter Design
41°F
Summer Design
81°F
ZIP Codes
46

Alameda HVAC Contractors: Get Your Free Manual J Report

Climate Zone 3C requires precise load calculations. Upload your Alameda blueprint and get a professional Manual J report in 60 seconds— first report is FREE. Pre-loaded with Alameda's exact design temperatures (41°F winter / 81°F summer).

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Verify Your Alameda ZIP Code

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

Alameda covers 46 ZIP codes: 94501, 94502, 94536, 94538, 94539, 94541, 94542, 94544, 94545, 94546 and 36 more

Alameda Design Temperatures

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

Winter 99% Design Temp
41°F
Summer 1% Design Temp
81°F
Summer Wet Bulb
63°F

IECC Requirements for Zone 3C

Minimum insulation and window requirements for Alameda per IECC 2021.

Wall Insulation:R-20
Roof/Ceiling:R-30
Floor Insulation:R-19
Window U-Factor:0.32
Window SHGC:0.4

Energy Code: 2022 Title 24

Recommended HVAC Equipment for Alameda

Heating Systems

Gas furnace
Heat pump
Typical AFUE
90-95%

Cooling Systems

AC (often optional)
Heat pump
Typical SEER
14 SEER

Related Climate Zone Pages

Learn More About
Climate Zone 3C
View All Zones in
California
HVAC Permits for
Alameda, California

Get Free Manual J Calculations for Alameda

Upload your Alameda blueprint and get a professional Manual J load calculation using official Zone 3C design temperatures. First report is FREE.

Alameda design temps
Zone 3C compliant
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