Zion, IL Climate Specs + Top-Rated Window Installers
ENERGY STAR groups Lake County into its Northern zone, the U-factor and SHGC target worth checking against any quote you get in Zion. Below that spec discussion sit 5 installers, their order set by Google rating, since Zion is outside this site's window license file. A high rating is worth a look, not a finished decision.
Google Maps ratings checked · How we rank
5AIECC climate zone · ENERGY STAR Northern zone
What zone 5A means for a Zion window
Moisture and glass performance are handled by different parts of a window's spec sheet, and a Zion 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 3.1 mi away.
Storm and weather risk around Zion
FEMA scores Lake County's winter-weather risk as Relatively Moderate and its flood risk as Relatively High.
Winter risk in Zion 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 Zion contractor, not one.
- Hurricane
- Very Low
- Strong wind
- Very High
- 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 Zion 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.
5 top-rated window installers near Zion, IL
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.
- Ridge Top ExteriorsGoogle reviews
- Waukegan Gurnee GlassGoogle reviews
- Hill's Roofing & WindowsGoogle reviews
- J&J Windows & FenceGoogle reviews
- Illinois Contract GlazingGoogle reviews