San Mateo, California HVAC Climate Zone

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

Climate Zone
3C
Winter Design
41°F
Summer Design
81°F
ZIP Codes
30

San Mateo HVAC Contractors: Get Your Free Manual J Report

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

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Verify Your San Mateo ZIP Code

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

San Mateo covers 30 ZIP codes: 94002, 94005, 94010, 94014, 94015, 94019, 94020, 94021, 94025, 94027 and 20 more

San Mateo Design Temperatures

Official ASHRAE design temperatures for San Mateo, 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 San Mateo 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 San Mateo

Heating Systems

Gas furnace
Heat pump
Typical AFUE
90-95%

Cooling Systems

AC (often optional)
Heat pump
Typical SEER
14 SEER

Get Free Manual J Calculations for San Mateo

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

San Mateo design temps
Zone 3C compliant
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