Window Climate Specs for Costa Mesa, CA

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

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

3BIECC climate zone · ENERGY STAR South-Central zone

What zone 3B means for a Costa Mesa window

Costa Mesa falls in IECC climate zone 3B, and ENERGY STAR separately groups Orange 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 Costa Mesa.

A Los Angeles-Long Beach-Anaheim, 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 2.8 mi away.

Storm and weather risk around Costa Mesa

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 Costa Mesa home.

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

Strong wind: Relatively Moderate
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 Costa Mesa 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 Costa Mesa

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

California WindowsWindow and glass contractor · licensed 39 years · 92626Verify license
Barnard Glass & MirrorWindow and glass contractor · licensed 35 years · 92627Verify license
G Lurie & Associates INCWindow and glass contractor · licensed 35 years · 92626Verify license
Harbor All Glass & Mirror INCWindow and glass contractor · licensed 31 years · 92617Verify license
Wishon CO INCWindow and glass contractor · licensed 25 years · 92627Verify license
K & D Window And DoorWindow and glass contractor · licensed 22 years · 92626Verify license
Just Do It InstallationsWindow and glass contractor · licensed 20 years · 92627Verify license
Integrity Builders General Contractors INCWindow and glass contractor · licensed 18 years · 92627Verify license
Orange County Sliding DoorWindow and glass contractor · licensed 17 years · 92626Verify license
Craftsman Glass COWindow and glass contractor · licensed 13 years · 92627Verify license
Arka Windows & Glass DoorsWindow and glass contractor · licensed 11 years · 92626Verify license
Affordable Coastal Glass INCWindow and glass contractor · licensed 9 years · 92627Verify license

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