Top-Rated Window Installers Near Longmont, CO
Local risk and climate data for Longmont, CO sit below, translated into plain terms for a window buyer rather than left as raw codes. 9 installers follow that data instead of a license roster, their rank built from Google's star rating and how many people left one. Checked October 2026.
Google Maps ratings checked · How we rank
5BIECC climate zone · ENERGY STAR Northern zone
Longmont's climate zone, in plain terms
Boulder, CO runs a January average near 29°F and climbs to about 73°F by July, a swing that adds up to roughly 6,111 heating degree days most winters, with 657 on the summer cooling side of the ledger.
That load is the actual argument for paying up for a better U-factor in Longmont, separate from anything a brochure claims.
Zone 5B's requirement is the floor; Longmont'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 1.2 mi away.
What FEMA's risk data says about Longmont
Boulder County's hail risk sits at Relatively High and its wildfire risk at Relatively High, according to FEMA's National Risk Index.
Hail risk matters for glass and screen durability in Longmont; 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 Longmont installer before you settle on a product line.
- Strong wind
- Relatively High
- 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 Longmont 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.
Longmont'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.
- WestPro Home ExteriorsGoogle reviews
- BlueBird Windows & DoorsGoogle reviews
- Meier All County GlassGoogle reviews
- Stone Creek Roofing & SolarGoogle reviews
- Smart WindowsGoogle reviews
- Renewal by Andersen Window ReplacementGoogle reviews
- Complete Exteriors of ColoradoGoogle reviews
- Hillcrest GlassGoogle reviews
- Budget Home SupplyGoogle reviews