How Do I Remove Water From a Double Pane Window?
Last updated October 25, 2026
The short answer
Why Water Gets Trapped Inside
Double pane windows have two glass sheets sealed together with an air space between them. This seal keeps insulating gas in and moisture out. When that seal breaks, humidity enters the space and condenses into visible water or fog. The failure is permanent; the trapped water cannot be wiped away from the outside.
This seal failure is common over time due to weather exposure, physical stress, or manufacturing flaws. In a humid subtropical climate with hot humid summers and a Gulf hurricane season, temperature swings can accelerate seal breakdown. The water you see is between the panes, indicating the window's thermal barrier is compromised and needs professional attention.
DIY Methods Are Not Effective
Homeowners sometimes try to drill a small hole to drain the moisture, but this rarely works and often causes more damage. Drilling can crack the glass, leave sharp edges, and destroy any remaining insulating value. The hole also introduces more outside air and contaminants, leading to dirt streaks inside the unit.
Other attempts like using a hairdryer on the glass exterior only heat the outer pane. This does not reach the moisture sealed inside and risks thermal stress cracks. Applying chemicals or desiccants externally cannot absorb the internal water. These methods are temporary and may not be recognized by the manufacturer.
- Drilling risks cracking the glass or inner pane.
- External heat does not dry the sealed interior space.
- Chemicals cannot penetrate the sealed unit.
- DIY repairs often void manufacturer warranties.
- A poor fix can lead to mold growth between panes.
- The structural integrity of the window may be weakened.
The Professional Repair Process
A qualified window professional or glazer will assess whether the insulated glass unit (IGU) can be replaced separately from the window frame. They measure the dimensions and order a new sealed unit with the proper gas fill. The old glass is carefully removed from the sash or frame without damaging the surrounding materials.
The pro installs the new IGU, ensuring a perfect fit and a weathertight seal. They may also inspect and repair the window's sash, seals, and weep holes to prevent future issues. This repair restores the window's energy efficiency, clarity, and function. It is a precise job requiring specific tools and expertise.
When Full Window Replacement Is Needed
If the window frame, sash, or surrounding structure is also warped or damaged by water, replacing just the glass unit may not be sufficient. Rotted wood, compromised vinyl, or a bent aluminum frame cannot properly hold the new sealed unit. In such cases, a full window replacement becomes the more reliable long-term solution.
Full replacement is also advisable if the windows are old, inefficient, or if multiple units have failed. Modern windows offer better energy performance and seals. A window contractor can help you choose a suitable replacement that matches your home's style and improves its weather resistance. This can be a wise investment in many climates.
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Call Now (832) 979-5241Frequently asked questions
Can a failed window seal cause mold?
Mold generally requires organic material to grow. Between glass panes, there is none, so mold is unlikely there. However, if the leak is from outside water infiltrating the wall around the window, that wet wood or drywall can develop mold. A water damage inspection can check surrounding areas.
Will my homeowner's insurance cover the repair?
Coverage depends on the cause of the damage. Gradual seal failure from age is often considered maintenance and not covered. If the failure resulted from a sudden, covered event like storm damage or impact, a portion might be covered. Policies vary, and your insurer decides what is covered.
How long does a professional window repair take?
Replacing the sealed glass unit often takes a professional a few hours per window once the new unit is on site. Ordering the custom glass can take one to three weeks. Full window replacement takes longer, usually a day or more per window, depending on the installation complexity.