Window Climate Specs for Hawthorne, CA
ENERGY STAR groups Los Angeles County into its South-Central zone, which is the U-factor and SHGC target worth checking against any quote you get in Hawthorne. The longest-licensed window contractors based in Hawthorne are listed below the climate data.
Licenses checked · California Contractors State License Board
3BIECC climate zone · ENERGY STAR South-Central zone
Hawthorne's climate zone, in plain terms
Hawthorne falls in IECC climate zone 3B, and ENERGY STAR separately groups Los Angeles 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 Hawthorne.
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 1 mi away.
What FEMA's risk data says about Hawthorne
Los Angeles County's hail risk sits at Relatively Moderate and its wildfire risk at Very High, according to FEMA's National Risk Index.
Hail risk matters for glass and screen durability in Hawthorne; wildfire risk matters more for the frame material and nearby vegetation than for the glass itself.
Either way, it's a reasonable question to bring to a Hawthorne installer before you settle on a product line.
- Strong wind
- Relatively Moderate
- Winter weather
- Relatively Moderate
Data: FEMA, National Risk Index for Natural Hazards - County-level table, v1.20 (v1.20, December 2025).
Guides to finish before Hawthorne 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.
Hawthorne's longest-licensed window installers
Oldest license first, newest last, pulled directly from the state's file. This list isn't for sale.
- J R S RenovationVerify license
- L & M InstallationVerify license
- Diamond Glass And MirrorVerify license
- All Level Installations Of Finish Carpentry INCVerify license
- Avenue Glass & Screen CO INCVerify license
- Luxvue LTDVerify license
- First Quality Glass INCVerify license
- Adamm's Stained GlassVerify license