Moorhead, MN Climate Specs + Top-Rated Window Installers
Moorhead 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 Moorhead on this site, so Google Maps supplies the 8 ranked names you see below. Checked October 2026.
Google Maps ratings checked · How we rank
6AIECC climate zone · ENERGY STAR Northern zone
Moorhead's climate zone, in plain terms
Fargo, ND-MN runs a January average near 8°F and climbs to about 71°F by July, a swing that adds up to roughly 8,822 heating degree days most winters, with 566 on the summer cooling side of the ledger.
That load is the actual argument for paying up for a better U-factor in Moorhead, separate from anything a brochure claims.
Zone 6A's requirement is the floor; Moorhead'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 1.6 mi away.
What FEMA's risk data says about Moorhead
FEMA scores Clay County's winter-weather risk as Relatively High and its flood risk as Relatively Moderate.
Winter risk in Moorhead 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 Moorhead contractor, not one.
- Strong wind
- Relatively Moderate
- 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 Moorhead 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.
Moorhead'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.
- Window World of FargoGoogle reviews
- Renewal by Andersen of Northern PlainsGoogle reviews
- The Window & Door StoreGoogle reviews
- Onyx Exteriors LLCGoogle reviews
- Fargo Siding & WindowsGoogle reviews
- ABC Seamless of FargoGoogle reviews
- Rusco Window and CabinetryGoogle reviews
- Nelson Window CoGoogle reviews