Stillwater, MN Climate Specs + Top-Rated Window Installers
ENERGY STAR groups Washington County into its Northern zone, the U-factor and SHGC target worth checking against any quote you get in Stillwater. Below that spec discussion sit 5 installers, their order set by Google rating, since Stillwater 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
Stillwater's climate zone, in plain terms
Minneapolis-St. Paul-Bloomington, MN-WI runs a January average near 14°F and climbs to about 71°F by July, a swing that adds up to roughly 8,008 heating degree days most winters, with 511 on the summer cooling side of the ledger.
That load is the actual argument for paying up for a better U-factor in Stillwater, separate from anything a brochure claims.
Zone 6A's requirement is the floor; Stillwater'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 1.4 mi away.
What FEMA's risk data says about Stillwater
Washington County's hail risk sits at Relatively High and its wildfire risk at Relatively Low, according to FEMA's National Risk Index.
Hail risk matters for glass and screen durability in Stillwater; wildfire risk matters more for the frame material and nearby vegetation than for the glass itself.
Either way, it's a reasonable question to bring to a Stillwater installer before you settle on a product line.
- Strong wind
- Very High
- Winter weather
- Relatively Moderate
Data: FEMA, National Risk Index for Natural Hazards - County-level table, v1.20 (v1.20, December 2025).
Guides to finish before Stillwater 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.
Stillwater'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 Installation Specialists, IncGoogle reviews
- Stillwater GlassGoogle reviews
- Krumm ExteriorsGoogle reviews
- Buildtec Contracting CompanyGoogle reviews
- Legacy Exteriors LLCGoogle reviews