Franconia, VA Climate Specs + Top-Rated Window Installers
ENERGY STAR groups Fairfax County into its North-Central zone, the U-factor and SHGC target worth checking against any quote you get in Franconia. Below that spec discussion sit 10 installers, their order set by Google rating, since Franconia 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
4AIECC climate zone · ENERGY STAR North-Central zone
Franconia's climate zone, in plain terms
Washington-Arlington-Alexandria, DC-VA-MD-WV runs a January average near 38°F and climbs to about 81°F by July, a swing that adds up to roughly 3,769 heating degree days most winters, with 1,738 on the summer cooling side of the ledger.
That load is the actual argument for paying up for a better U-factor in Franconia, separate from anything a brochure claims.
Zone 4A's requirement is the floor; Franconia'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 8.7 mi away.
What FEMA's risk data says about Franconia
FEMA scores Fairfax County's winter-weather risk as Very High and its flood risk as Relatively High.
Winter risk in Franconia 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 Franconia contractor, not one.
- Hurricane
- Relatively Moderate
- Strong wind
- Relatively High
- 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 Franconia 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.
Franconia'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.
- Old Town Glass And Mirror LLCGoogle reviews
- Titans Window Glass RepairGoogle reviews
- Pro Glass Window RepairsGoogle reviews
- TrueCraft Windows and DoorsGoogle reviews
- Metric WindowsGoogle reviews
- NOVA ExteriorsGoogle reviews
- Certified Window Co.Google reviews
- Neighbor Glass LLCGoogle reviews
- First Choice Windows LLCGoogle reviews
- Nations Choice ExteriorsGoogle reviews