Gretna, LA Climate Specs + Top-Rated Window Installers
Gretna sits in IECC climate zone 2A, which sets the energy-performance bar here no matter who ends up installing your windows. A window license file doesn't cover Gretna on this site, so Google Maps supplies the 6 ranked names you see below. Checked October 2026.
Google Maps ratings checked · How we rank
2AIECC climate zone · ENERGY STAR Southern zone
Gretna's climate zone, in plain terms
Jefferson Parish's normal precipitation runs about 63.9 inches a year, with 0.0 inches of snow, which is a separate question from energy performance but still shapes which window details matter in Gretna.
Moisture and glass performance are handled by different parts of a window's spec sheet, and a Gretna buyer benefits from checking both instead of assuming one implies the other.
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 0.7 mi away.
What FEMA's risk data says about Gretna
FEMA scores Jefferson Parish's winter-weather risk as Relatively High and its flood risk as Relatively High.
Winter risk in Gretna 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 Gretna contractor, not one.
- Hurricane
- Very High
- Strong wind
- Relatively Moderate
- Winter weather
- Relatively High
Data: FEMA, National Risk Index for Natural Hazards - County-level table, v1.20 (v1.20, December 2025).
Guides to finish before Gretna 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.
Gretna's top-rated window installers, by Google
The order below weighs a Google rating against its review count, the same way this site weighs a U-factor against a brochure claim: on the number, not the name. Treat it as a rating, never as proof of a license, bond or HVHZ approval.
- Star Glass IncGoogle reviews
- Windows of New OrleansGoogle reviews
- Zinsel Glass & MirrorGoogle reviews
- Eco Windows New OrleansGoogle reviews
- Auto & Home Window ReplacementGoogle reviews
- Jefferson Door CompanyGoogle reviews