Why Your Windows Are Sweating Indoors and How to Fix It

September 27, 2022

The windows throughout your home are a gateway to the outdoors, a way to allow light in when you enjoy the view of your garden, yard or scenery. The last thing you need to see is a sweaty window coated in a film of condensation.

Not only are windows coated in condensation unsightly, they also can be a sign of a larger air-quality problem inside your home. Thankfully, there’s multiple things you can do to correct the problem.

What Causes Condensation in Windows

Condensation on the interior of windows is formed by the moist warm air inside your home mixing with the cooler surface of your windows. It’s notably prevalent around the winter when it’s much cooler outside than it is inside your home.

Inside Moisture vs. In Between Panes

When talking about condensation, it’s necessary to know the contrast between moisture on the inside of your windows versus moisture in between the windowpanes. One is an air-quality issue and the other is a window issue.

  • Moisture within a window is caused from the warm humid air in your home forming on the glass.
  • Existing moisture you notice between windowpanes is formed when the window seal breaks down and moisture gets in between the two panes of glass, and at that point the window has to be repaired or replaced.
  • Condensation in the windows isn’t a window problem and can instead be resolved by changing the humidity in your home. Numerous things generate humidity throughout a home, like showers, cooking, laundry or even breathing.

Why Condensation on Windows Can Be Trouble

Although you might think condensation on the inside of your windows is a cosmetic issue, it may also be a sign your home has high humidity. If this is in fact the case, water may also be condensing on window frames, cold walls or other surfaces. Even a thin film of water can cause wood surfaces to mildew or rot over time, promoting the growth of mildew or mold.

How to Reduce Humidity Inside Your Home

The good news is there are several options for extracting moisture from the air throughout your home.

If you have a humidifier operating in your home – whether it be a smaller unit or a whole-house humidifier – lower it further so the humidity inside your home decreases.

If you don’t have a humidifier running and your home’s humidity level is high, look into installing a dehumidifier. While humidifiers put moisture in your home so the air doesn’t dry out, a dehumidifier extracts excess moisture out of the air.

Small, portable dehumidifiers can eliminate the water from an entire room. However, those units require clearing water trays and generally service a somewhat limited area. A whole-house dehumidifier will extract moisture throughout your entire home.

Whole-house dehumidifier systems are managed by a humidistat, which enables you to set a humidity level precisely as you would select a temperature with your thermostat. The unit will start immediately when the humidity level surpasses the set level. These systems collaborate with your home’s HVAC system, so you will want to contact experienced professionals for whole-house dehumidifier installation Longview.

Alternative Ways to Reduce Condensation on Windows

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

By reducing humidity inside your home and dispersing air throughout your home, you can enjoy clear, moisture-free windows even during the winter.