Cary, NC Climate Specs + Top-Rated Window Installers
ENERGY STAR groups Wake County into its South-Central zone, the U-factor and SHGC target worth checking against any quote you get in Cary. Below that spec discussion sit 10 installers, their order set by Google rating, since Cary 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
3AIECC climate zone · ENERGY STAR South-Central zone
Cary's climate zone, in plain terms
Cary falls in IECC climate zone 3A, and ENERGY STAR separately groups Wake County into its South-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 Cary.
A Raleigh-Cary, NC 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 2.8 mi away.
What FEMA's risk data says about Cary
FEMA scores Wake County's winter-weather risk as Relatively Moderate and its flood risk as Relatively High.
Winter risk in Cary 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 Cary contractor, not one.
- Hurricane
- Relatively Moderate
- Strong wind
- Relatively Low
- 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 Cary 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.
Cary'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.
- Kelly Window and Door, Inc.Google reviews
- Raleigh Windows and Siding, LLCGoogle reviews
- Apex Energy Solutions - Window Replacement & Entry Doors - RaleighGoogle reviews
- Energy One Windows of Raleigh NCGoogle reviews
- APL Glass Windows and MoreGoogle reviews
- City Mirror & Glass, Inc.Google reviews
- My Guys Remodeling - Replacement Windows, Hardie Siding & Exterior DoorsGoogle reviews
- Windows, Doors & More, IncGoogle reviews
- Window Works Co.Google reviews
- Window World of RaleighGoogle reviews