Why Your Windows Are Sweating Indoors and How to Fix It

September 27, 2022

The windows in your home are a gateway to the outdoors, a way to let light in as you appreciate the view of your garden, yard or landscape. The last thing you would want to see is a sweaty window coated in a layer of condensation.

Not only are windows coated in condensation unappealing, they also can be a sign of a more serious air-quality problem within your home. Luckily, there’s several things you can try to address the problem.

What Causes Condensation along Windows

Condensation on the interior of windows is produced by the humid warm air inside your home mixing with the cooler surface of your windows. It’s notably commonplace in the winter when it’s much cooler outside than it is in your home.

Inside Moisture vs. In Between Panes

When discussing condensation, it’s necessary to know the difference between moisture on the inside of your windows in comparison to moisture in between the windowpanes. One is an indoor air quality issue and the other is a window issue.

  • Moisture inside a window is created from the warm damp air inside your home collecting along the glass.
  • Existing moisture you see between windowpanes is caused when the window seal stops working and moisture seeps between the two panes of glass, and by then the window should be repaired or replaced.
  • Condensation on the inside of the windows isn’t a window issue and can instead be solved by fine-tuning the humidity in your home. Many things cause humidity inside a home, including showers, cooking, taking a bath or even breathing.

Why Condensation on Windows Can Be Trouble

Though you might consider condensation inside your windows is a cosmetic issue, it can be a sign your home has high humidity. If this is the case, water could also be condensing on window frames, cold walls or other surfaces. Even a slim film of water can help wood surfaces to mildew or rot over time, fostering the growth of mildew or mold.

How to Lower Humidity in Your Home

The good news is there are numerous options for eliminating moisture from the air in your home.

If you have a humidifier operating within your home – whether it be a small-scale unit or a whole-house humidifier – lower it further so the humidity inside your home comes down.

If you don’t have a humidifier active and your home’s humidity level is higher than you prefer, consider purchasing a dehumidifier. While humidifiers introduce moisture inside your home so the air doesn’t dry out, a dehumidifier extracts excess moisture out of the air.

Smaller, portable dehumidifiers can remove the water from one room. However, those units require clearing water trays and usually service a small area. A whole-house dehumidifier will eliminate moisture from your entire home.

Whole-house dehumidifier systems are regulated by a humidistat, which permits you to specify a humidity level the same as you would pick a temperature via your thermostat. The unit will run immediately when the humidity level exceeds the set level. These systems coordinate with your home’s HVAC system, so you will want to contact experienced professionals for whole-house dehumidifier installation Wausau.

Alternative Ways to Reduce Condensation on Windows

  • Exhaust fans. Adding exhaust fans near humidity hotspots like the bathroom, laundry room or above the oven can help by extracting the warm, moist air from these spaces out of your home before it can elevate the humidity level throughout your home.
  • Ceiling fans. Spinning ceiling fans can also keep air swirling throughout the home so humid air doesn’t get trapped in one spot.
  • Opening your window treatments. Throwing open the blinds or drapes can reduce condensation by stopping the damp air from being stuck against the windowpane.

By lowering humidity across your home and dispersing air throughout your home, you can make the most of clear, moisture-free windows even in the winter.