Rock Island, IL Climate Specs + Top-Rated Window Installers
ENERGY STAR groups Rock Island County into its Northern zone, the U-factor and SHGC target worth checking against any quote you get in Rock Island. Below that spec discussion sit 6 installers, their order set by Google rating, since Rock Island 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
Rock Island's climate zone, in plain terms
Davenport-Moline-Rock Island, IA-IL runs a January average near 23°F and climbs to about 76°F by July, a swing that adds up to roughly 6,024 heating degree days most winters, with 1,041 on the summer cooling side of the ledger.
That load is the actual argument for paying up for a better U-factor in Rock Island, separate from anything a brochure claims.
Zone 5A's requirement is the floor; Rock Island'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 3.2 mi away.
What FEMA's risk data says about Rock Island
Rock Island County's hail risk sits at Relatively Moderate and its wildfire risk at Very Low, according to FEMA's National Risk Index.
Hail risk matters for glass and screen durability in Rock Island; wildfire risk matters more for the frame material and nearby vegetation than for the glass itself.
Either way, it's a reasonable question to bring to a Rock Island installer before you settle on a product line.
- Hurricane
- Very Low
- Strong wind
- Relatively High
- 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 Rock Island 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.
Rock Island'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.
- Midwest Window CompanyGoogle reviews
- New Look WindowGoogle reviews
- Mainstream Home ImprovementGoogle reviews
- Mid-American Glazing Systems, Inc.Google reviews
- Fanth - Curry Home Improvement CoGoogle reviews
- Quality Glass & MirrorGoogle reviews