What Jacksonville Homes Need From a Replacement Window
ENERGY STAR groups Duval County into its Southern zone, which is the U-factor and SHGC target worth checking against any quote you get in Jacksonville. The longest-licensed window contractors based in Jacksonville are listed below the climate data.
Licenses checked · Florida Department of Business and Professional Regulation
2AIECC climate zone · ENERGY STAR Southern zone
What zone 2A means for a Jacksonville window
Jacksonville, FL runs a January average near 56°F and climbs to about 84°F by July, a swing that adds up to roughly 944 heating degree days most winters, with 3,303 on the summer cooling side of the ledger.
That load is the actual argument for paying up for a better U-factor in Jacksonville, separate from anything a brochure claims.
Zone 2A's requirement is the floor; Jacksonville'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 7.1 mi away.
Storm and weather risk around Jacksonville
Duval County's hail risk sits at Relatively High and its wildfire risk at Relatively Moderate, according to FEMA's National Risk Index.
Hail risk matters for glass and screen durability in Jacksonville; 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 Jacksonville installer before you settle on a product line.
- Hurricane
- Relatively High
- Strong wind
- Relatively Moderate
- Winter weather
- Very Low
Data: FEMA, National Risk Index for Natural Hazards - County-level table, v1.20 (v1.20, December 2025).
Guides to finish before Jacksonville 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.
Window installers with the longest license records in Jacksonville
Oldest license first, newest last, pulled directly from the state's file. This list isn't for sale.
- Ace Door & Window Company INCVerify license
- Renaissance Windows & Doors INCVerify license
- American Windows Products INCVerify license
- Paul's Window Services INCVerify license