What Fontana Homes Need From a Replacement Window

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

Fontana falls in IECC climate zone 3B, and ENERGY STAR separately groups San Bernardino 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 Fontana.

A Riverside-San Bernardino-Ontario, 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 8.7 mi away.

Storm and weather risk around Fontana

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 Fontana home.

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

Strong wind: Relatively High
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 Fontana 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 Fontana

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

Lira ConstructionWindow and glass contractor · licensed 32 years · 92335Verify license
Advanced Mission Glass CorporationWindow and glass contractor · licensed 28 years · 92335Verify license
A S A P GlasswerksWindow and glass contractor · licensed 21 years · 92336Verify license
M T M Windows And Glass DoorsWindow and glass contractor · licensed 10 years · 92335Verify license
B M Quality Glass InstallWindow and glass contractor · licensed 9 years · 92336Verify license
Retro Windows & Patio Doors ServicesWindow and glass contractor · licensed 7 years · 92335Verify license
Alex Windows INCWindow and glass contractor · licensed 6 years · 92335Verify license
Acg Builders INCWindow and glass contractor · licensed 6 years · 92335Verify license
R W BuildersWindow and glass contractor · licensed 1 year · 92335Verify license
Amersa Glass LLCWindow and glass contractor · licensed 1 year · 92334Verify license
Alpha GlazierWindow and glass contractor · licensed under a year · 92336Verify license

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