Gorham, ME Climate Specs + Top-Rated Window Installers
Gorham sits in IECC climate zone 6A, which sets the energy-performance bar here no matter who ends up installing your windows. A window license file doesn't cover Gorham on this site, so Google Maps supplies the 10 ranked names you see below. Checked October 2026.
Google Maps ratings checked · How we rank
6AIECC climate zone · ENERGY STAR Northern zone
Gorham's climate zone, in plain terms
Gorham falls in IECC climate zone 6A, and ENERGY STAR separately groups Cumberland County into its Northern 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 Gorham.
A Portland-South Portland, ME 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 7.4 mi away.
What FEMA's risk data says about Gorham
FEMA scores Cumberland County's winter-weather risk as Very High and its flood risk as Relatively Low.
Winter risk in Gorham 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 Gorham contractor, not one.
- 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 Gorham 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.
Gorham'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.
- Horsley Exteriors LLCGoogle reviews
- Pella Windows and Doors Showroom of Scarborough, MEGoogle reviews
- Regal Replacement WindowsGoogle reviews
- The Maine Window CompanyGoogle reviews
- All Time Builders, LLCGoogle reviews
- Quinn's Installation ContractorGoogle reviews
- Window World of Southern MaineGoogle reviews
- Maine Windows and DoorsGoogle reviews
- Paradigm WindowsGoogle reviews
- Loranger Door & Window Company IncGoogle reviews