Window Climate Specs for Modesto, CA

ENERGY STAR groups Stanislaus County into its South-Central zone, which is the U-factor and SHGC target worth checking against any quote you get in Modesto. The longest-licensed window contractors based in Modesto are listed below the climate data.

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

3BIECC climate zone · ENERGY STAR South-Central zone

What zone 3B means for a Modesto window

Moisture and glass performance are handled by different parts of a window's spec sheet, and a Modesto buyer benefits from checking both instead of assuming one implies the other.

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 mi away.

Storm and weather risk around Modesto

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 Modesto home.

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

Strong wind: Relatively Low
Winter weather: Relatively Low

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

Guides to finish before Modesto 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 Modesto

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

Don's Mobile Glass INCWindow and glass contractor · licensed 47 years · 95357Verify license
American Glass CompanyWindow and glass contractor · licensed 47 years · 95350Verify license
A - 1 Glass COWindow and glass contractor · licensed 37 years · 95350Verify license
Emergency GlassWindow and glass contractor · licensed 20 years · 95355Verify license
Lapham Windows INCWindow and glass contractor · licensed 20 years · 95343Verify license
Custom Shower & GlassWindow and glass contractor · licensed 20 years · 95351Verify license
Raul's Glass PlusWindow and glass contractor · licensed 17 years · 95355Verify license
Honeys Air & SolarWindow and glass contractor · licensed 16 years · 95356Verify license
Baijan Construction INCWindow and glass contractor · licensed 7 years · 95351Verify license
JT's Glass INCWindow and glass contractor · licensed 6 years · 95353Verify license
Right Touch Screens And WindowsWindow and glass contractor · licensed 5 years · 95355Verify license
Bright View Glass INCWindow and glass contractor · licensed 5 years · 95355Verify license

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