Bristol, TN Climate Specs + Top-Rated Window Installers
ENERGY STAR groups Sullivan County into its North-Central zone, the U-factor and SHGC target worth checking against any quote you get in Bristol. Below that spec discussion sit 7 installers, their order set by Google rating, since Bristol 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
What zone 4A means for a Bristol window
Bristol falls in IECC climate zone 4A, and ENERGY STAR separately groups Sullivan County into its North-Central zone for window certification.
Those two numbers, not the brand on the box, set the U-factor and SHGC worth checking on any quote you get in Bristol.
A Kingsport-Bristol, TN-VA contractor who can't name either one on request is worth a second question before you sign.
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 12 mi away.
Storm and weather risk around Bristol
FEMA scores Sullivan County's winter-weather risk as Relatively Low and its flood risk as Relatively Moderate.
Winter risk in Bristol 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 Bristol contractor, not one.
- Hurricane
- Very Low
- Strong wind
- Relatively High
- 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 Bristol 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.
7 top-rated window installers near Bristol, TN
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 Tri-CitiesGoogle reviews
- All Seasons Sunrooms LLCGoogle reviews
- The Door Store, Windows and MoreGoogle reviews
- S & S Home RepairsGoogle reviews
- Tri City Door & WindowGoogle reviews
- Bristol GlassGoogle reviews
- Lebanon Glass Inc. - BristolGoogle reviews