Dedham's Climate Data and Its Top-Rated Window Pros
Dedham sits in IECC climate zone 5A, which sets the energy-performance bar here no matter who ends up installing your windows. A window license file doesn't cover Dedham on this site, so Google Maps supplies the 9 ranked names you see below. Checked September 2026.
Google Maps ratings checked · How we rank
5AIECC climate zone · ENERGY STAR Northern zone
What zone 5A means for a Dedham window
Moisture and glass performance are handled by different parts of a window's spec sheet, and a Dedham buyer benefits from checking both instead of assuming one implies the other.
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 3.9 mi away.
Storm and weather risk around Dedham
FEMA scores Norfolk County's winter-weather risk as Relatively Low and its flood risk as Relatively High.
Winter risk in Dedham 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 Dedham contractor, not one.
- Hurricane
- Relatively Moderate
- Strong wind
- Relatively Moderate
- Winter weather
- Relatively Low
Data: FEMA, National Risk Index for Natural Hazards - County-level table, v1.20 (v1.20, December 2025).
Guides to finish before Dedham 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.
9 top-rated window installers near Dedham, MA
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.
- DeFrancesco ConstructionGoogle reviews
- GF Sprague ExteriorsGoogle reviews
- Roost Roofing and SidingGoogle reviews
- Classic window specialist IncGoogle reviews
- Boston Exterior RemodelingGoogle reviews
- Window NationGoogle reviews
- King Shade & Window Co.Google reviews
- Ace Glass Company - Ace Automatic DoorGoogle reviews
- Hillcrest Glass Company, IncGoogle reviews