San Marcos's Climate Data and Its Top-Rated Window Pros
San Marcos sits in IECC climate zone 2A, which sets the energy-performance bar here no matter who ends up installing your windows. A window license file doesn't cover San Marcos on this site, so Google Maps supplies the 5 ranked names you see below. Checked September 2026.
Google Maps ratings checked · How we rank
2AIECC climate zone · ENERGY STAR Southern zone
San Marcos's climate zone, in plain terms
Austin-Round Rock-San Marcos, TX runs a January average near 51°F and climbs to about 85°F by July, a swing that adds up to roughly 1,620 heating degree days most winters, with 2,974 on the summer cooling side of the ledger.
That load is the actual argument for paying up for a better U-factor in San Marcos, separate from anything a brochure claims.
Zone 2A's requirement is the floor; San Marcos'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 1.1 mi away.
What FEMA's risk data says about San Marcos
Hays 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 San Marcos; 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 San Marcos installer before you settle on a product line.
- Hurricane
- Relatively Low
- 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 San Marcos 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.
San Marcos'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.
- West Shore HomeGoogle reviews
- Window NationGoogle reviews
- Low Price Auto Glass & TintGoogle reviews
- Proficient Glass and MirrorGoogle reviews
- San Marcos Pro Siding ContractorGoogle reviews