Foggy Windows or Condensation Between Panes? Here’s the Real Reason Why.

Learn what seal failure is, how to fix it affordably, and why glass replacement—starting around $750—is often all you need in Denver’s climate.

Seal Failure Window

1/3

Foggy Windows? Understanding Seal Failure in Denver Homes

Why it happens, how to fix it, and what Denver homeowners really need to know.

If your windows look foggy, hazy, or constantly cloudy—especially between the panes—you’re likely dealing with window seal failure, one of the most common window issues in the Denver Metro. With our high altitude, strong UV exposure, and dramatic temperature swings, seals in insulated glass units (IGUs) tend to break down faster here than in many other parts of the country.

Once the seal fails, moisture enters the space between the panes, creating that permanent fog you can’t wipe away from either side.

Many window companies use this as a chance to sell you an entirely new window, but the truth is simple: in many cases, the glass itself is the only component that needs to be replaced.

Modern windows are typically dual-pane units filled with insulating gas and sealed around the edges. Over time, this seal can fail due to Colorado’s climate—intense sun during the day, rapid nighttime cool-downs, freezing winters, and pressure changes at high elevation.

When the seal breaks, moisture collects inside the glass unit and causes:

Persistent fog or haze
Moisture streaks between panes
Cloudiness or dirty-looking windows
Reduced energy efficiency
Hot or cold drafts near the window

Seal failure doesn’t mean your entire window is bad—just that the insulated glass unit needs attention.

What Seal Failure Really Means for Denver Homes

Glass Replacement vs. Full Window Replacement: What’s the Right Choice?

A foggy window doesn’t automatically mean you need a full window replacement. In many cases, a glass-only replacement is the more affordable and practical option—and that’s usually what homeowners end up choosing.

Glass Replacement (IGU Replacement)

A new insulated glass unit typically starts around $750 depending on size and energy features. This option restores clarity, comfort, and insulation without touching the frame. It’s fast, effective, and budget-friendly—perfect when the frames are still structurally sound.

Full Window Replacement

There are times when replacing the whole window makes more sense—especially if your home has aging frames, poor insulation, or older single-pane systems. A full replacement gives you:

Better energy efficiency
Modern, more durable window frames
Installers who insulate the window opening with foam
Increased home value and curb appeal

At Remod Exteriors, our goal is simple: educate you on both options so you can make the right decision, not push the most expensive solution.

Denver and the surrounding areas—Arvada, Golden, Broomfield, Westminster, Lakewood—experience climate conditions that are especially tough on windows.

These include:

High altitude pressure changes
Extreme UV exposure causing seal breakdown
Rapid temperature swings (40° shifts are common)
Cold winters and strong sun creating expansion and contraction
Dry climate + occasional moisture pulses

All of these accelerate seal deterioration. Many Denver homeowners experience foggy windows far sooner than the typical 20–30 year lifespan you read about online.

Why Seal Failure Happens So Often in the Denver Metro

The Truth: You Don’t Always Need a New Window

Some companies in the window replacement world immediately push full replacements, using foggy glass as “proof” that everything must go. That’s simply not true.

At Remod Exteriors, we evaluate:

The condition of the frames
The age of the windows
The efficiency you’re currently getting
Whether glass replacement or full replacement fits your goals

No pressure. No gimmicks. No inflated discounts like “Buy 2 Get 2 Free” or “50% Off Today Only”—just real, honest solutions based on what your home needs.

Free Inspection
We inspect your window frames, glass, seals, and surrounding interior/exterior areas.
Clear Recommendation
Sometimes you need new glass. Sometimes full replacement makes more sense. We explain both.
Straightforward Pricing
Transparent, consistent quotes—no games.
Professional Installation
Whether it’s a new IGU or a full window, we install it to modern standards, ensuring long-term performance.
Support Beyond the Install
Your windows should last—and we’re here if questions come up later.

Our Process for Fixing Foggy Windows in Denver

We’re on a Mission to Improve Denver’s Window Industry

Homeowners deserve better than:

Fake discounts
Pushy in-home presentations
Misleading “free installation” sales pitches
High-pressure same-day signings
Confusion and upsells
That’s why Remod Exteriors was built around trust, transparency, and education.
Honest guidance builds trust.
Trust builds confidence.
Confidence builds community.
This is how we do things differently in the Denver Metro.