Andersen 100 Series Windows: What Crystal Lake Homeowners Need to Know

If you’ve lived through a McHenry County winter with old windows, you already know the problem. Drafts around the frames, frost on the glass, and a furnace that never stops running. We see it on almost every window job we quote in Crystal Lake, Woodstock, Algonquin — same story, different house.

The Andersen 100 Series is one of the products we install most often as a replacement. Not because it’s the cheapest option or the most expensive. Because it hits a sweet spot that makes sense for most homeowners upgrading from vinyl or aluminum.

Here’s what you actually need to know.

What Is the Andersen 100 Series?

Andersen calls it “The Smart Alternative to Vinyl.” That’s marketing, but the product backs it up.

The 100 Series sits at the entry level of Andersen’s lineup — their “Good” tier in a Good/Better/Best system. Above it you’ve got the 200 Series (wood interior, vinyl exterior), the 400 Series (their bestseller with wood interiors and more options), and then the A-Series and E-Series for high-end custom work.

The 100 Series launched in 2008. By 2025, Andersen had produced over 10 million of them. That’s not a niche product — that’s a proven track record.

Who is it for? Homeowners replacing vinyl or aluminum windows who want better performance and durability without jumping to wood-interior pricing. If your current windows are builder-grade vinyl from the ’90s or early 2000s, the 100 Series is the logical next step.

What’s Fibrex? (And Why Should You Care?)

Fibrex is Andersen’s proprietary composite material. You can’t get it from anyone else.

The composition: 40% reclaimed wood fiber by weight, 60% thermoplastic polymer. Andersen reclaims most of the wood fiber from their own manufacturing process, so there’s a sustainability angle if that matters to you.

Here’s what matters from an installation standpoint:

• 2x stronger than vinyl. That means narrower frame profiles and more glass area in the same opening. You actually see more of the outside.
• 700x better thermal performance than aluminum. If you’re coming from aluminum frames — and we see plenty of those in older Crystal Lake homes — the difference is night and day.
• 12x thicker finish than painted vinyl. The color is blended into the material during manufacturing. It doesn’t get painted on. It won’t fade, flake, blister, peel, pit, or corrode.
• No painting. Ever. The color goes all the way through the material. Scratch it and the color underneath is the same.

Fibrex also resists rot, decay, and fungal growth. That matters here. McHenry County gets constant moisture cycling — snow, ice melt, rain, freeze, repeat. Wood frames eventually lose that battle. Fibrex doesn’t.

What Options Are Available?

More than most people expect from an entry-level line.

Window Styles (7 Total)

Colors

Exterior (5 options): White, Sandtone, Terratone, Dark Bronze, Black

Interior (4 options): White, Sandtone, Dark Bronze, Black

One thing to know: Dark Bronze and Black interiors are only available when matched with the same exterior color. White and Sandtone interiors can pair with any exterior.

Glass Packages

Standard is Low-E glass with Argon gas fill — that gets you to a U-Factor of 0.27 on casement/picture windows, or 0.30 on single-hung/double-hung/gliding. Beyond that:

• SmartSun — blocks solar heat gain and filters 95% of UV rays while still letting visible light through. Good for south-facing and west-facing windows.
• HeatLock Coating — reflects escaping interior heat back into the room. Think of it as an extra insulation layer on the glass itself. Essential for single-hung, double-hung, and gliding windows to provide comfortable code margin.
• Tinted glass — for solar heat control on sun-blasted exposures.
• Triple-pane (casement, awning, and picture only) — launched October 2025. Goes as low as U-Factor 0.15 with Enhanced w/HeatLock on picture windows. The only way to meet Energy Star 7.0 Northern Zone (0.22) with the 100 Series.

Grids

Three configuration types: between-the-glass (easy to clean), simulated divided light, and full divided light for that authentic multi-pane look. Patterns include Colonial, Prairie, and several others.

Performance Specs That Actually Matter

Numbers first:

Source: 2024-25 Andersen 100 Series Product Guide, NFRC Certified Total Unit Performance

The Energy Star Situation — Honest Assessment

We need to be straight about this because a lot of window companies won’t be.

Here’s what you need to know about code compliance: Casement and picture windows with standard Low-E (U-Factor 0.27–0.28) comfortably meet Illinois building code for Climate Zone 5A — the state requires 0.30 or lower.

Single-hung, double-hung, and gliding windows are right at the limit at 0.30 with standard Low-E. If you add grilles, those jump to 0.31 — which actually exceeds code. That’s why we recommend HeatLock on those window types. It drops the U-Factor to 0.25–0.26, giving you real margin.

The 100 Series does not meet Energy Star 7.0 for the Northern Zone with any dual-pane configuration. That standard requires a U-Factor of 0.22 or lower. The 100 Series now offers triple-pane on casement, awning, and picture windows. Triple-pane casement with SmartSun (0.22) just meets Energy Star Northern Zone. Triple-pane Enhanced w/HeatLock (0.18 on casement, 0.15 on picture) exceeds it.

Does that mean the 100 Series is a bad window? No. For most homeowners replacing aging vinyl or aluminum, the dual-pane 100 Series delivers real energy improvement. If Energy Star 7.0 Northern Zone certification is a must-have, we now have triple-pane options within the 100 Series lineup.

Warranty — What You’re Actually Getting

Andersen backs the 100 Series with a 20/10/10 warranty structure from the date of purchase:

• Glass: 20 years. Covers manufacturing defects, discoloration, fogginess between panes.
• Non-glass components (frames, sashes, hardware): 10 years from purchase.
• Exterior color finish: 10 years from purchase against flaking, blistering, cracking, pitting, and fading.

(Full warranty PDF from Andersen)

Transferable — Owner-to-Owner Program

This is a big deal if you ever sell your home. The warranty transfers automatically to the new owner through Andersen’s Owner-to-Owner program — no form, no fee, no deadline. The new owner gets the full remaining warranty, not a reduced version. That’s a real selling point at closing.

You don’t have to register to get the transfer — it happens automatically. If you want to, optional registration is available at andersenwindows.com/support/warranty-registration. Keep your purchase documentation for any future claims. Claims go to 1-888-888-7020 within 30 days of discovering a defect.

What’s Not Covered

Improper installation (which is why you want a certified contractor — it can void the warranty), product modifications, weatherstripping wear, and labor costs. Andersen also excludes damage from accidents and non-manufacturing causes.

This exclusion for improper installation is exactly why the installer matters. Andersen’s warranty document explicitly excludes installation-related issues for non-certified installers. If a big box store sends out an installer who doesn’t flash the window correctly, that’s not Andersen’s problem — it’s yours.

What You Get From Us on Top — The Elite Certified Contractor Advantage

Because we’re an Andersen Elite Certified Contractor, you get an additional 2-year installation warranty that you cannot get from an uncertified installer. That covers the work itself — how the window was installed in your wall.

Home Depot and Lowe’s sell Andersen windows. Same product. But they don’t provide the installation warranty. Big box installers are not Andersen Certified Contractors. If there’s an installation problem — bad shimming, improper flashing, a leak that develops because the window wasn’t sealed right — you have no coverage through Andersen and no local, accountable company to call.

With IHC: you get the product warranty AND the 2-year installation warranty. Both are in effect from day one.

Why the 100 Series Makes Sense in McHenry County

We’re in Climate Zone 5A. That’s the official designation, but what it means in practice: long, cold winters with temperatures that regularly drop into the teens and occasionally below zero. January averages highs of 29 and lows of 15. We get sustained cold from December through early March.

Freeze-thaw is brutal on windows. Water gets into gaps, freezes, expands, thaws, and does it again — over and over from November through April. Vinyl gets brittle in the cold and can warp in summer heat. Fibrex holds its shape through all of it.

Air infiltration matters more here. When it’s 15 degrees in January and the wind is blowing across the prairie, any gap around your window frame is money walking out of your house. The 100 Series tests at 0.30 cfm/ft² or better — that’s tight.

The housing stock fits. Crystal Lake, Cary, Lake in the Hills, Huntley — most of these homes were built between the 1970s and 2000s with builder-grade vinyl or aluminum windows. The 100 Series is designed for replacement in exactly that situation. Custom sizing in 1/8-inch increments means we can fit non-standard openings, which older homes always seem to have.

Moisture resistance. Between snow load, ice melt, freeze-thaw, and spring rains, windows in McHenry County take constant moisture exposure. Fibrex doesn’t rot, doesn’t decay, doesn’t grow mold. Twenty years from now, your frames will still look like the day we installed them.

Frequently Asked Questions

Q: Is the Andersen 100 Series made in the USA?

A: Yes. Andersen manufactures in the United States, Canada, and Italy. Their headquarters and primary production facility are in Bayport, Minnesota — an 8-million-square-foot complex.

Q: Can I get the 100 Series with triple-pane glass?

A: Yes — as of October 2025, triple-pane is available on casement, awning, and picture windows. It’s not available on single-hung, double-hung, or gliding styles. Triple-pane gets the U-Factor as low as 0.15 on picture windows with Enhanced w/HeatLock glass.

Q: Does the 100 Series qualify for Energy Star in Illinois?

A: It depends on the configuration. No dual-pane 100 Series meets Energy Star 7.0 Northern Zone (requires 0.22). Triple-pane casement with SmartSun (0.22) just meets it, and triple-pane Enhanced w/HeatLock (0.18) exceeds it. All configurations meet Illinois building code (0.30 max), though single-hung/double-hung/gliding are right at the limit with standard Low-E — we recommend HeatLock for comfortable margin.

Q: How many colors are available?

A: Five exterior colors (White, Sandtone, Terratone, Dark Bronze, Black) and four interior colors (White, Sandtone, Dark Bronze, Black). Dark Bronze and Black interiors require a matching exterior color.

Q: What’s the difference between the 100 Series and Renewal by Andersen?

A: Both use Fibrex composite. Renewal by Andersen is Andersen’s direct-to-consumer division — they sell, manufacture, and install as one company. The 100 Series is sold through Andersen Certified Contractors like us. Same parent company, different distribution channel and product lines.

Q: Is the warranty transferable if I sell my house?

A: Yes. Andersen’s Owner-to-Owner program transfers the remaining warranty to the new homeowner. The 100 Series carries a 20-year warranty on glass and 10-year warranty on non-glass components and exterior finish. That’s a real selling point when you list your property.

Q: Why should I use an Andersen Certified Contractor?

A: You get a 2-year installation warranty that isn’t available through uncertified installers. IHC is an Andersen Elite Certified Contractor — the highest tier available. Our team is trained directly by Andersen on proper installation techniques, and we follow their guidelines for water management, flashing, and sealing. Improper installation can void the product warranty — certified installation protects your investment.

Get a Free Estimate

We’ve been installing Andersen windows across McHenry County since 2005. If your windows are drafty, fogged, or just past their prime, let’s talk about what the 100 Series can do for your home.

Call or text: (815) 356-9020
Innovative Home Concepts — Crystal Lake, IL
McHenry County’s only Andersen Elite Certified Contractor.

Rhett Wilborn

President & Founder, Innovative Home Concepts

Rhett Wilborn founded Innovative Home Concepts in 2005 and has led the company through 20+ years of exterior remodeling across McHenry County, IL. A James Hardie Preferred Remodeler, Andersen Elite Contractor, and CertainTeed ShingleMaster, Rhett holds more manufacturer certifications than any contractor in the county.

Published April 13, 2026