Climate ZonesCaliforniaSonoma

Sonoma, California HVAC Climate Zone

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

Climate Zone
3C
Winter Design
41°F
Summer Design
81°F
ZIP Codes
36

Sonoma HVAC Contractors: Get Your Free Manual J Report

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

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Verify Your Sonoma ZIP Code

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

Sonoma covers 36 ZIP codes: 94922, 94923, 94928, 94931, 94951, 94952, 94954, 95401, 95403, 95404 and 26 more

Sonoma Design Temperatures

Official ASHRAE design temperatures for Sonoma, 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 Sonoma 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 Sonoma

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
Sonoma, California

Get Free Manual J Calculations for Sonoma

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

Sonoma design temps
Zone 3C compliant
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