Two Great Windows, Two Different Philosophies
Andersen (Bayport, Minnesota, since 1903) builds around a wood core protected by vinyl-based Perma-Shield cladding — a recipe essentially unchanged since 1966 because it works. Marvin (Warroad, Minnesota, since 1912) went a different direction: aluminum-clad wood in its Signature line and pultruded Ultrex fiberglass in Elevate and Essential, prized for thin sightlines and dimensional stability.
We sell and install both, every week, across the Treasure Valley. Here's the honest version of how they stack up.
Spec Comparison
| Andersen 400 Series | Marvin Elevate | Marvin Signature Ultimate | |
|---|---|---|---|
| Construction | Wood core, Perma-Shield vinyl exterior | Wood interior, Ultrex fiberglass exterior | Wood interior, extruded aluminum exterior |
| Typical U-factor (dual-pane Low-E) | 0.26–0.31 | 0.26–0.30 | 0.25–0.30 |
| Exterior maintenance | None (cladding is the finish) | None | None |
| Sightlines | Traditional, substantial | Slim | Slim to custom |
| Glass warranty | 20 years | 20 years | 20 years |
| Relative installed price | $$ | $$$ | $$$$ |
(Per-unit NFRC numbers vary by style and size — casements test better than double-hungs in both brands. We quote exact tested values line by line.)
Where Andersen Wins
Value in clad-wood. The 400 Series delivers a true wood window with a no-paint exterior at a price Marvin doesn't try to match. For traditional Boise homes — North End bungalows, Bench mid-centuries — it's the default recommendation and passes historic design review where vinyl can't.
Field history. Perma-Shield has five decades of performance in climates exactly like ours. There is no "how will it age?" question left to answer.
Where Marvin Wins
Modern aesthetics. Ultrex fiberglass allows thinner frames and bigger glass. For contemporary builds and view-oriented foothills homes, Marvin's sightlines are the reason architects spec it.
Dimensional stability. Fiberglass expands at nearly the rate of glass itself, so the glass-to-frame seal is stressed less through Idaho's hot-cold cycles — a genuine engineering advantage for seal longevity on big units and dark exterior colors.
Big openings. For oversized units, multi-slide doors, and custom shapes, Marvin's Signature line has the deeper catalog.
The Part Nobody Puts in the Brochure
Either window will still be a great window in 2050 if it's installed correctly. Flashing, squareness, insulation, and sill support determine whether a premium window performs like one. That's the actual reason to buy either brand from a dealer whose installers are employees: the same company measures, orders, installs, and services the warranty. That's how Wood Windows has run it since 1980.
Want both quotes side by side for your home? One measure appointment gets you real numbers on Andersen and Marvin. Call (208) 376-2200 or use the form on this page.
Frequently Asked Questions
Is Marvin better than Andersen?
Neither is 'better' across the board — we install both and would put either in our own homes. Marvin's fiberglass (Ultrex) construction and sightlines lead in modern and architectural applications; Andersen's 400 Series clad-wood is the proven value in traditional homes. The right answer depends on your home's style, exposures, and budget.
Which is more expensive, Andersen or Marvin?
Line for line, Marvin typically runs 10–25% above comparable Andersen products. Andersen's 400 Series usually beats Marvin Elevate on price; Marvin Signature and Andersen A-Series/E-Series compete at the architectural top end.
Who has the better warranty, Andersen or Marvin?
They're comparable: Andersen covers glass 20 years / components 10, transferable owner-to-owner. Marvin covers glass 20 years / interior components 10 / exterior cladding and Ultrex 20 in most lines. In practice, what matters more is who services the warranty — as an authorized dealer for both, Wood Windows handles claims locally with our own crews.
Which brand is better for Idaho's climate?
Both hit the U ≤ 0.30 zone-5B target easily with the right glass package. Marvin's Ultrex fiberglass expands at nearly the same rate as glass, which helps seal longevity through Idaho's 85-degree annual temperature swings; Andersen's Perma-Shield cladding has 50+ years of field history in this exact climate. We spec by elevation and exposure, not by logo.
Sources & Testing Data
Last reviewed 2026-07-04 by Wood Windows Inc — (208) 376-2200