Window Climate Specs for Ferndale, WA
ENERGY STAR groups Whatcom County into its Northern zone, which is the U-factor and SHGC target worth checking against any quote you get in Ferndale. The longest-licensed window contractors based in Ferndale are listed below the climate data.
Licenses checked · Washington State Department of Labor & Industries
4CIECC climate zone · ENERGY STAR Northern zone
What zone 4C means for a Ferndale window
Moisture and glass performance are handled by different parts of a window's spec sheet, and a Ferndale 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 4.8 mi away.
Storm and weather risk around Ferndale
FEMA scores Whatcom County's winter-weather risk as Relatively Moderate and its flood risk as Relatively Moderate.
Winter risk in Ferndale 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 Ferndale contractor, not one.
- Strong wind
- Very Low
- Winter weather
- Relatively Moderate
Data: FEMA, National Risk Index for Natural Hazards - County-level table, v1.20 (v1.20, December 2025).
Guides to finish before Ferndale 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 Ferndale
Oldest license first, newest last, pulled directly from the state's file. This list isn't for sale.
- Eurocraft Arch Insts LLCVerify license
- Northwest Glass LLCVerify license
- G2Cu Windows LLCVerify license
- Clearview GlassVerify license