Window Climate Specs for Ventura, CA

Ventura sits in IECC climate zone 3C, which sets the energy-performance bar for any window installed here. Below that, a short list of Ventura'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

What zone 3C means for a Ventura window

Ventura falls in IECC climate zone 3C, and ENERGY STAR separately groups Ventura County into its South-Central zone for window certification.

Those two numbers, not the brand on the box, set the U-factor and SHGC worth checking on any quote you get in Ventura.

A Oxnard-Thousand Oaks-Ventura, CA contractor who can't name either one on request is worth a second question before you sign.

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 3.9 mi away.

Storm and weather risk around Ventura

FEMA scores Ventura County's winter-weather risk as Very Low and its flood risk as Very High.

Winter risk in Ventura weighs on U-factor and condensation resistance; flood risk weighs more on sill height and drainage detailing than on the glass package.

Treat these as two separate conversations with a Ventura contractor, not one.

Strong wind: Relatively 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 Ventura 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.

Window installers with the longest license records in Ventura

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

Center Glass CO No 9Window and glass contractor · licensed 60 years · 93003Verify license
Quality WindowsWindow and glass contractor · licensed 33 years · 93003Verify license
C R I Landscape & Concrete INCWindow and glass contractor · licensed 28 years · 93004Verify license
Bill Morris Contracting INCWindow and glass contractor · licensed 28 years · 93001Verify license
West Coast Sash & Door INCWindow and glass contractor · licensed 27 years · 93003Verify license
Chapala Iron & Manufacturing Company INCWindow and glass contractor · licensed 25 years · 93003Verify license
Kidd CO Door And GlassWindow and glass contractor · licensed 24 years · 93003Verify license
Clear Vision Windows Glass & MirrorWindow and glass contractor · licensed 21 years · 93003Verify license
Aim Glass & Mirror Service INCWindow and glass contractor · licensed 20 years · 93033Verify license
Riviera Bronze MFG LLCWindow and glass contractor · licensed 15 years · 93001Verify license
Quality Windows INCWindow and glass contractor · licensed 13 years · 93003Verify license
Blue Sky Window And ServicesWindow and glass contractor · licensed 11 years · 93004Verify license

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