Window Climate Specs for Lynnwood, WA
Lynnwood sits in IECC climate zone 4C, which sets the energy-performance bar for any window installed here. Below that, a short list of Lynnwood's longest-licensed window contractors can turn a spec into an actual installed window.
Licenses checked · Washington State Department of Labor & Industries
4CIECC climate zone · ENERGY STAR Northern zone
Lynnwood's climate zone, in plain terms
Moisture and glass performance are handled by different parts of a window's spec sheet, and a Lynnwood buyer benefits from checking both instead of assuming one implies the other.
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 5.5 mi away.
What FEMA's risk data says about Lynnwood
FEMA scores Snohomish County's winter-weather risk as Relatively High and its flood risk as Relatively High.
Winter risk in Lynnwood 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 Lynnwood contractor, not one.
- Strong wind
- Very Low
- 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 Lynnwood 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.
Lynnwood's longest-licensed window installers
Oldest license first, newest last, pulled directly from the state's file. This list isn't for sale.
- Bills Glass CompanyVerify license
- Distinctive Glass INCVerify license
- Statton Glass INCVerify license
- Glass ExpertsVerify license
- Lookout Glass LLCVerify license
- Parker Henry Glass & StorefrntVerify license
- Enhanced Home Windows & DoorsVerify license