Windham's Climate Data and Its Top-Rated Window Pros
ENERGY STAR groups Cumberland County into its Northern zone, the U-factor and SHGC target worth checking against any quote you get in Windham. Below that spec discussion sit 7 installers, their order set by Google rating, since Windham 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
6AIECC climate zone · ENERGY STAR Northern zone
Windham's climate zone, in plain terms
Portland-South Portland, ME runs a January average near 20°F and climbs to about 70°F by July, a swing that adds up to roughly 7,434 heating degree days most winters, with 447 on the summer cooling side of the ledger.
That load is the actual argument for paying up for a better U-factor in Windham, separate from anything a brochure claims.
Zone 6A's requirement is the floor; Windham'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 5.3 mi away.
What FEMA's risk data says about Windham
FEMA rates Cumberland County's hurricane risk as Relatively Moderate and its wind risk as Relatively Moderate.
Neither rating changes a window's energy label, but both are exactly what impact-resistance and design-pressure ratings are built to answer for a Windham home.
Ask specifically about design pressure and impact rating for Windham, not just energy performance, if either risk rating comes back on the high side.
- Hurricane
- Relatively Moderate
- Strong wind
- Relatively Moderate
- 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 Windham 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.
Windham'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.
- Portland Glass of RaymondGoogle reviews
- Regal Replacement WindowsGoogle reviews
- DaBellaGoogle reviews
- The Maine Window CompanyGoogle reviews
- Maine Windows and DoorsGoogle reviews
- Kota ConstructionGoogle reviews
- Paradigm WindowsGoogle reviews