South Holland, IL Climate Specs + Top-Rated Window Installers
Local risk and climate data for South Holland, IL sit below, translated into plain terms for a window buyer rather than left as raw codes. 7 installers follow that data instead of a license roster, their rank built from Google's star rating and how many people left one. Checked October 2026.
Google Maps ratings checked · How we rank
5AIECC climate zone · ENERGY STAR Northern zone
What zone 5A means for a South Holland window
South Holland falls in IECC climate zone 5A, and ENERGY STAR separately groups Cook County into its Northern zone for window certification.
Those two numbers, not the brand on the box, set the U-factor and SHGC worth checking on any quote you get in South Holland.
A Chicago-Naperville-Elgin, IL-IN contractor who can't name either one on request is worth a second question before you sign.
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 5 mi away.
Storm and weather risk around South Holland
FEMA scores Cook County's winter-weather risk as Very High and its flood risk as Very High.
Winter risk in South Holland 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 South Holland contractor, not one.
- Hurricane
- Very Low
- Strong wind
- Very High
- Winter weather
- Very High
Data: FEMA, National Risk Index for Natural Hazards - County-level table, v1.20 (v1.20, December 2025).
Guides to finish before South Holland 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.
7 top-rated window installers near South Holland, 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.
- Feldco Windows, Siding, Doors & Roofing of HomewoodGoogle reviews
- Custom Plate GlassGoogle reviews
- Glass & Mirror AmericaGoogle reviews
- AJ's Doors & WindowsGoogle reviews
- J & J Glass Co IncGoogle reviews
- Midway Building SupplyGoogle reviews
- Silver Line Windows & Doors - Cornerstone Building BrandsGoogle reviews