What San Clemente Homes Need From a Replacement Window
San Clemente sits in IECC climate zone 3B, which sets the energy-performance bar for any window installed here. Below that, a short list of San Clemente's longest-licensed window contractors can turn a spec into an actual installed window.
Licenses checked · California Contractors State License Board
3BIECC climate zone · ENERGY STAR South-Central zone
San Clemente's climate zone, in plain terms
Los Angeles-Long Beach-Anaheim, CA runs a January average near 56°F and climbs to about 70°F by July, a swing that adds up to roughly 1,377 heating degree days most winters, with 682 on the summer cooling side of the ledger.
That load is the actual argument for paying up for a better U-factor in San Clemente, separate from anything a brochure claims.
Zone 3B's requirement is the floor; San Clemente'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 11.8 mi away.
What FEMA's risk data says about San Clemente
Orange County's hail risk sits at Relatively Moderate and its wildfire risk at Relatively High, according to FEMA's National Risk Index.
Hail risk matters for glass and screen durability in San Clemente; 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 San Clemente installer before you settle on a product line.
- 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 San Clemente 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.
San Clemente's longest-licensed window installers
Oldest license first, newest last, pulled directly from the state's file. This list isn't for sale.
- A - Better Glass COVerify license
- Seacore Industrial INCVerify license
- All That Glass ShopVerify license
- Allusions GlazingVerify license