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Moisture Between Window Panes: Causes and Solutions for Foggy Windows

If you’ve ever peered out of your once-crystal-clear windows only to be met with a hazy, foggy view, you’re not alone. Join our foggy window repair experts from Glass Solutions as we explore how moisture between window panes leads to foggy windows. Our team of insulated glass replacement technicians is providing you with practical solutions to restore your windows to their pristine, transparent glory. Say goodbye to foggy windows and hello to clarity and comfort as we uncover the secrets of foggy window repair in Raleigh.

The Cause of Moisture Between Window Panes

Moisture between window panes is a common issue that can be frustrating for homeowners. To understand why this happens, it’s essential to grasp the basic construction of double-pane windows and the factors that contribute to moisture intrusion.

Double pane windows consist of two separate glass panes with a spacer bar or frame in between them, creating a sealed unit. This sealed space is often filled with an insulating gas, such as argon or krypton, to enhance energy efficiency. The primary purpose of this design is to provide better insulation by reducing heat transfer and preventing drafts. 

A glass repair professional in Raleigh fixes moisture between window panes.

Moisture buildup between the panes can occur due to several factors, including the following reasons that lead to the need for foggy window repair or residential window replacements. 

Seal Failure

Over time, the seals around double-pane windows can deteriorate due to exposure to the elements, temperature fluctuations, and general wear and tear. When the seals break down, they no longer effectively block moisture from entering the space between the panes, leading to the need for window seal repair. 

Temperature Differences

Weather conditions, especially extreme temperature fluctuations, can cause the gas inside the sealed unit to expand and contract. This movement can stress the seals and create gaps, allowing moisture to infiltrate.


Condensation can form on the interior surface of the outer glass pane during temperature variations and high humidity levels. If the seals are compromised, this condensation can find its way into the space between the panes, leading to fogging.

Age of the Window

As double-pane windows age, they become more susceptible to seal failures and moisture intrusion. Older windows are generally more prone to this issue than newer ones with improved sealing technology.

What Causes Condensation on Windows?

Condensation on windows occurs when warm, moist air comes into contact with a cooler surface, causing the air’s moisture to condense into water droplets. This common phenomenon can be observed on both the interior and exterior surfaces of windows and is influenced by various factors. When mositure between window panes occures, the result you’ll see is condensation.

Here are some of the key causes of condensation on windows:

  • Temperature differences
  • High humidity levels
  • Inadequate ventilation
  • Single pane windows
  • Window quality and sealing
  • Outdoor weather conditions

To manage and reduce condensation on your windows, you can take several steps, such as:

  • Improving ventilation
  • Using dehumidifiers
  • Sealing gaps and cracks around windows
  • Upgrading to more energy-efficient windows. 

Understanding the causes of condensation is the first step toward effectively addressing this common issue in homes and buildings.

What Causes Condensation on Windows in Winter?

During the winters in North Carolina, condensation on windows is primarily caused by the temperature differential between the indoor and outdoor environments. When the cold outdoor air meets the warmer, moisture-laden indoor air, the window’s interior surface becomes significantly cooler. This abrupt temperature change causes the moisture in the indoor air to condense into water droplets on the glass.

High indoor humidity levels, common during the winter due to heating, cooking, and reduced ventilation, further exacerbate the issue. The combination of warm indoor air and elevated humidity makes it more likely for condensation to occur when it encounters the cold window surface.

Learn how to remove moisture between window panes and prevent foggy windows

Homes equipped with effective insulation to conserve energy can also experience more condensation during the winter months. While insulation keeps the indoor environment comfortable, it reduces heat transfer through windows, keeping the glass cooler and increasing the likelihood of condensation, which leads to trapped moisture between window panes. This could ultimately make it difficult to keep your home warm during the winter.  

How to Remove Moisture Between Window Panes

Removing moisture between window panes that leads to foggy windows can be a challenging task, and it often requires professional assistance. However, here are some steps you can take to attempt moisture removal.

Identify the Severity of the Foggy Windows

First, assess the extent of the problem. Is the condensation minimal and temporary, or is there a more serious issue with the seal between the panes? If the condensation is persistent and significant, you may need professional help.

Check Your Windows Warranty

If your windows are under warranty, contact the manufacturer or installer to inquire about coverage for window seal failure and moisture removal. They may offer repair or replacement services.

Dehumidify the Home’s Interior

Reduce indoor humidity levels by using a dehumidifier. Lowering the humidity can help prevent further moisture between window panes.

Ventilate Your Home

Improve ventilation by opening windows and using exhaust fans, especially in areas prone to high humidity like kitchens and bathrooms. Adequate ventilation can help dissipate moisture.

Use Silica Gel Packets

Place silica gel packets between the window panes. Silica gel can absorb moisture and may help reduce condensation over time. However, this is not a guaranteed solution for severe cases of foggy windows. 

Drill Small Holes

In some cases, professionals may drill small holes in the window frame to facilitate moisture removal. They can then use desiccants or other methods to dry the space between the panes.

Replace the Insulated Glass Unit (IGU)

If the window seals are severely compromised, the most effective solution may be to replace the entire insulated glass unit. This involves removing the fogged-up IGU and installing a new one. Contact a window replacement specialist for this task.

Consult a Professional Window Glass Expert 

For persistent or severe issues of moisture between window panes, it’s advisable to consult a professional glass repair and installation company. Professionals from Glass Solutions in Raleigh, NC have specialized tools and expertise to diagnose and resolve your foggy window problem effectively.

How to Clean Cloudy Double Pane Windows

Cleaning cloudy double-pane windows can improve their appearance and visibility, but it’s important to note that if the cloudiness is due to a seal failure or moisture between window panes, cleaning won’t fully resolve the issue. 

Materials You’ll Need:

  • Mild dish soap
  • Water
  • Soft lint-free cloths or microfiber towels
  • Squeegee
  • Window cleaning solution (commercial or DIY)

Here’s a step-by-step guide to cleaning the external surface of double-pane windows:

  • Assess the situation (inside or outside cloudiness).
  • Choose a cloudy or shaded day for cleaning.
  • Prepare a soapy water solution or use a commercial window cleaner.
  • Remove dust and debris from the window.
  • Wet the window with the cleaning solution.
  • Gently scrub the window with a soft cloth.
  • Use a squeegee to remove the cleaning solution from top to bottom.
  • Repeat the process if streaks or spots remain.
  • Dry and polish the window with a dry cloth or microfiber towel.
  • Inspect the window for any leftover streaks or residue.
  • If the cloudiness persists between the panes, consult a professional for foggy window repair or replacement.

Contact Glass Solutions for Foggy Window Repair in Raleigh 

If you want your windows to let in light and block out heat and cold, let us help you with our foggy window repair services. Our experienced team of glass repair experts is able to quickly install new insulated window glass so you can keep your home energy efficient without having to replace an entire window. Glass Solutions is your source of fixing issues with moisture between window panes through the installation of new, insulated double-pane windows.

Serving Raleigh, Cary, Garner, Apex, Wake Forest, and surrounding areas, our foggy window repair company is available to provide you with a free estimate and professional service. Contact us today to get started by calling  919-772-1007 or filling out the form below.