What Compton Homes Need From a Replacement Window
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 Compton. The longest-licensed window contractors based in Compton are listed below the climate data.
Licenses checked · California Contractors State License Board
3BIECC climate zone · ENERGY STAR South-Central zone
Compton's climate zone, in plain terms
Los Angeles-Long Beach-Anaheim, CA runs a January average near 58°F and climbs to about 71°F by July, a swing that adds up to roughly 1,091 heating degree days most winters, with 925 on the summer cooling side of the ledger.
That load is the actual argument for paying up for a better U-factor in Compton, separate from anything a brochure claims.
Zone 3B's requirement is the floor; Compton's specific load is what tells you whether beating that floor is worth the extra cost.
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 6.4 mi away.
What FEMA's risk data says about Compton
FEMA scores Los Angeles County's winter-weather risk as Relatively Moderate and its flood risk as Very High.
Winter risk in Compton 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 Compton contractor, not one.
- 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 Compton 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.
Compton's longest-licensed window installers
Oldest license first, newest last, pulled directly from the state's file. This list isn't for sale.
- J C Quality GlassVerify license
- MX3 Glass & Surfaces INCVerify license
- Genesis Glass CompanyVerify license
- Gomez Glazing COVerify license