Wilmington's Climate Data and Its Top-Rated Window Pros
ENERGY STAR groups New Castle County into its North-Central zone, the U-factor and SHGC target worth checking against any quote you get in Wilmington. Below that spec discussion sit 10 installers, their order set by Google rating, since Wilmington 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
4AIECC climate zone · ENERGY STAR North-Central zone
What zone 4A means for a Wilmington window
Wilmington falls in IECC climate zone 4A, and ENERGY STAR separately groups New Castle County into its North-Central 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 Wilmington.
A Philadelphia-Camden-Wilmington, PA-NJ-DE-MD 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 2.7 mi away.
Storm and weather risk around Wilmington
New Castle County's hail risk sits at Very Low and its wildfire risk at Very Low, according to FEMA's National Risk Index.
Hail risk matters for glass and screen durability in Wilmington; 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 Wilmington installer before you settle on a product line.
- Hurricane
- Relatively Moderate
- Strong wind
- Relatively 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 Wilmington 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.
10 top-rated window installers near Wilmington, DE
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.
- Pella Windows and Doors Showroom of Wilmington, DEGoogle reviews
- Tycos Roofing and SidingGoogle reviews
- Becker’s Roofing Siding & Chimney ContractorsGoogle reviews
- Homecraft Inc.Google reviews
- ALL UNITED Roofing and Siding, LLCGoogle reviews
- PJ FitzpatrickGoogle reviews
- FastGlassLLCGoogle reviews
- J.W. Tull Contracting ServicesGoogle reviews
- Newport Builders Windowland, Inc.Google reviews
- MDP ExteriorsGoogle reviews