Temecula, CA: Climate Zone, Risk and Window Requirements

ENERGY STAR groups Riverside County into its South-Central zone, which is the U-factor and SHGC target worth checking against any quote you get in Temecula. The longest-licensed window contractors based in Temecula are listed below the climate data.

Licenses checked September 30, 2026 · California Contractors State License Board

3BIECC climate zone · ENERGY STAR South-Central zone

Temecula's climate zone, in plain terms

Riverside-San Bernardino-Ontario, CA runs a January average near 57°F and climbs to about 74°F by July, a swing that adds up to roughly 1,368 heating degree days most winters, with 1,412 on the summer cooling side of the ledger.

That load is the actual argument for paying up for a better U-factor in Temecula, separate from anything a brochure claims.

Zone 3B's requirement is the floor; Temecula'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 4.9 mi away.

What FEMA's risk data says about Temecula

FEMA rates Riverside County's hurricane risk as Very Low and its wind risk as Relatively Moderate.

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 Temecula home.

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

Hurricane: Very Low
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 Temecula 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.

Temecula's longest-licensed window installers

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

North Coast Skylights INCWindow and glass contractor · licensed 38 years · 92592Verify license
So Cal Glass INCWindow and glass contractor · licensed 38 years · 92590Verify license
A A A Glass CompanyWindow and glass contractor · licensed 37 years · 92590Verify license
Straight - Line Glass And Mirror Company INCWindow and glass contractor · licensed 33 years · 92590Verify license
Tandem West Glass INCWindow and glass contractor · licensed 24 years · 92593Verify license
Assure Quality Construction (Aqc)Window and glass contractor · licensed 21 years · 92591Verify license
Harold And WrightWindow and glass contractor · licensed 17 years · 92591Verify license
A Plus Window Sales And InstallationWindow and glass contractor · licensed 15 years · 92592Verify license
Brandon's Screens & GlassWindow and glass contractor · licensed 15 years · 92592Verify license
Temecula Glass CompanyWindow and glass contractor · licensed 13 years · 92590Verify license
Kaydann CorporationWindow and glass contractor · licensed 11 years · 92590Verify license
Wes Agee ConstructionWindow and glass contractor · licensed 9 years · 92592Verify license

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