Holtsville, NY Climate Specs + Top-Rated Window Installers
Holtsville sits in IECC climate zone 4A, which sets the energy-performance bar here no matter who ends up installing your windows. A window license file doesn't cover Holtsville on this site, so Google Maps supplies the 10 ranked names you see below. Checked September 2026.
Google Maps ratings checked · How we rank
4AIECC climate zone · ENERGY STAR North-Central zone
What zone 4A means for a Holtsville window
New York-Newark-Jersey City, NY-NJ runs a January average near 32°F and climbs to about 75°F by July, a swing that adds up to roughly 5,183 heating degree days most winters, with 885 on the summer cooling side of the ledger.
That load is the actual argument for paying up for a better U-factor in Holtsville, separate from anything a brochure claims.
Zone 4A's requirement is the floor; Holtsville'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 3.2 mi away.
Storm and weather risk around Holtsville
FEMA rates Suffolk County's hurricane risk as Relatively High and its wind risk as Relatively High.
Neither rating changes a window's energy label, but both are exactly what impact-resistance and design-pressure ratings are built to answer for a Holtsville home.
Ask specifically about design pressure and impact rating for Holtsville, not just energy performance, if either risk rating comes back on the high side.
- Hurricane
- Relatively High
- 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 Holtsville 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.
10 top-rated window installers near Holtsville, NY
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.
- Right Angle Roofing & SidingGoogle reviews
- Long Island Roofing and SidingGoogle reviews
- King Quality Roofing and SidingGoogle reviews
- C & L Aluminum and GlassGoogle reviews
- Infinity Replacement by MarvinGoogle reviews
- Coast 2 Coast Roofing & ExteriorsGoogle reviews
- Island Wide Glass Repla used 202Google reviews
- Coram Glass & Mirror IncGoogle reviews
- WindowRamaGoogle reviews
- Unified Home RemodelingGoogle reviews