Sunland, CA: Climate Zone, Risk and Window Requirements
Sunland sits in IECC climate zone 3B, which sets the energy-performance bar for any window installed here. Below that, a short list of Sunland'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
What zone 3B means for a Sunland window
Los Angeles-Long Beach-Anaheim, CA runs a January average near 56°F and climbs to about 76°F by July, a swing that adds up to roughly 1,400 heating degree days most winters, with 1,481 on the summer cooling side of the ledger.
That load is the actual argument for paying up for a better U-factor in Sunland, separate from anything a brochure claims.
Zone 3B's requirement is the floor; Sunland'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 4.1 mi away.
Storm and weather risk around Sunland
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 Sunland home.
Ask specifically about design pressure and impact rating for Sunland, not just energy performance, if either risk rating comes back on the high side.
- 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 Sunland 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 Sunland
Oldest license first, newest last, pulled directly from the state's file. This list isn't for sale.
- Bari Iron DesignVerify license
- Greco GlassVerify license
- Frameless Glass LaVerify license
- P & N Iron Work INCVerify license