Campbell, CA: Climate Zone, Risk and Window Requirements

Campbell sits in IECC climate zone 3C, which sets the energy-performance bar for any window installed here. Below that, a short list of Campbell's longest-licensed window contractors can turn a spec into an actual installed window.

Licenses checked September 30, 2026 · California Contractors State License Board

3CIECC climate zone · ENERGY STAR South-Central zone

Campbell's climate zone, in plain terms

San Jose-Sunnyvale-Santa Clara, CA runs a January average near 49°F and climbs to about 70°F by July, a swing that adds up to roughly 2,562 heating degree days most winters, with 625 on the summer cooling side of the ledger.

That load is the actual argument for paying up for a better U-factor in Campbell, separate from anything a brochure claims.

Zone 3C's requirement is the floor; Campbell's specific load is what tells you whether beating that floor is worth the extra cost.

Data: U.S. EPA / DOE, ENERGY STAR, ENERGY STAR Version 7.0 Climate Zones by County/ZIP (Windows, Doors, and Skylights) (V7.0); Pacific Northwest National Laboratory (DOE Building America), Guide to Determining Climate Zone by County: Building America and IECC 2021 Updates (PNNL-33270) (2021 IECC), from the nearest NOAA station 3.4 mi away.

What FEMA's risk data says about Campbell

Neither rating changes a window's energy label, but both are exactly what impact-resistance and design-pressure ratings are built to answer for a Campbell home.

Ask specifically about design pressure and impact rating for Campbell, not just energy performance, if either risk rating comes back on the high side.

Strong wind: Very Low
Winter weather: Very Low

Data: FEMA, National Risk Index for Natural Hazards - County-level table, v1.20 (v1.20, December 2025).

Guides to finish before Campbell window bids come in

How to Read an NFRC Window Label Four numbers on one sticker decide most of a window's real-world performance. Here's what each one means.
ENERGY STAR Window Criteria by Climate Zone ENERGY STAR splits the country into four zones, each with its own numbers. Here they are, and why the Northern zone works backward from the other three.
Impact Windows vs. Shutters in Florida's Hurricane Zones Florida gives homeowners two paths to a protected opening. Here's how each one is tested, and where the HVHZ raises the bar further.

Campbell's longest-licensed window installers

Oldest license first, newest last, pulled directly from the state's file. This list isn't for sale.

California Plus Engineering INCWindow and glass contractor · licensed 37 years · 95008Verify license
Super GlassWindow and glass contractor · licensed 34 years · 95008Verify license
Cambrian Glass CompanyWindow and glass contractor · licensed 28 years · 95008Verify license
J & M Windows And Glass INCWindow and glass contractor · licensed 26 years · 95008Verify license
Murray ConstructionWindow and glass contractor · licensed 26 years · 95008Verify license
Argonaut Window & Door INCWindow and glass contractor · licensed 19 years · 95008Verify license
Murray WindowWindow and glass contractor · licensed 7 years · 95008Verify license
American Window Specialist INCWindow and glass contractor · licensed 6 years · 95008Verify license
My Windows And Glass Patio DoorsWindow and glass contractor · licensed 4 years · 95008Verify license
Bay Glass & Showers INCWindow and glass contractor · licensed 2 years · 95008Verify license
San Jose Showers INCWindow and glass contractor · licensed under a year · 95008Verify license

More California climate pages

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