Window Climate Specs for Naugatuck, CT
ENERGY STAR groups Naugatuck Valley Planning Region into its Northern zone, which is the U-factor and SHGC target worth checking against any quote you get in Naugatuck. The longest-licensed window contractors based in Naugatuck are listed below the climate data.
Licenses checked · Connecticut Department of Consumer Protection
5AIECC climate zone · ENERGY STAR Northern zone
Naugatuck's climate zone, in plain terms
Waterbury-Shelton, CT runs a January average near 29°F and climbs to about 74°F by July, a swing that adds up to roughly 5,642 heating degree days most winters, with 818 on the summer cooling side of the ledger.
That load is the actual argument for paying up for a better U-factor in Naugatuck, separate from anything a brochure claims.
Zone 5A's requirement is the floor; Naugatuck'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 9.5 mi away.
What FEMA's risk data says about Naugatuck
FEMA scores Naugatuck Valley Planning Region's winter-weather risk as Relatively High and its flood risk as Relatively High.
Winter risk in Naugatuck 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 Naugatuck contractor, not one.
- Hurricane
- Relatively High
- 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 Naugatuck 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.
Naugatuck's longest-licensed window installers
Oldest license first, newest last, pulled directly from the state's file. This list isn't for sale.
- Premium Siding & Windows LLCVerify license
- Naugatuck Window And Glass LLCVerify license
- Valley Window Systems LLCVerify license