How can you Keep your Windows from Fogging Up in the Winter?

Posted by Kris Lindahl on Monday, February 1st, 2016 at 8:34am.

Foggy Window - Image Credit:

What good does it do to have a view of the winter wonderland outside of your home’s windows if you can’t see it for all the fog on the glass? It’s frustrating, but it’s a fact of life here in Minnesota when the heat goes on inside the home and the air outside is frosty. There is a way, however, to help you see clearly. Read on.

What causes it?

Condensation occurs with the combination of moisture and temperature. The moisture in this case is the humidity inside the home. Air can only hold so much moisture, and the amount is can hold depends on the air temperature. “When air at a certain temperature contains all the vapor it can hold, it's said to be ‘saturated’, which means a relative humidity of 100 percent. When it holds only half the water vapor it can hold, the relative humidity is 50 percent. Cooler air cannot hold as much water vapor as warmer air,” claim the experts at

When that moist, warm air hits the cold glass in your windows, the excess moisture condenses and your windows drip with water or fog up. It’s quite similar to how your ice cold glass of lemonade gets drippy on the outside on a hot summer day.

Solving the Problem

Solve the problem by reducing the humidity inside the home. If you think your home’s air isn’t humid, consider this: even your family’s breathing causes humidity in a closed up home. In fact, the folks at claim that “the normal daily activities of a family of four can add more than 18 gallons of water a week into the air in the home.”

So, should you stop breathing? Not quite. Here are a few things each member of the family can do to bring down the relative humidity inside the home:

  • Use the exhaust fan in the bathroom while taking a shower or bath and leave it on for a few minutes after finishing.
  • Take cooler, shorter showers.
  • Use the kitchen exhaust fan while cooking.
  • Open a window for a few minutes several times a day.
  • Place all of your houseplants in one room over the winter.

If all else fails, purchase a dehumidifier for the home.

Kris Lindahl
Kris Lindahl Real Estate

Leave a Comment