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Condensation on Windows: Why It Occurs & How to Minimize It

Condensation on windows is a problem in many homes. It’s more common in the winter when the temperature is below 40° Fahrenheit. This can happen even in newer homes with excellent insulation.

Sweating windows can indicate humidity problems in your home. In this post, your trusted window replacement expert, Renewal by Andersen® of Spokane, discusses the causes of window condensation and ways to minimize it.   

Condensation on Windows

The density of gas varies with the temperature. It gets less dense at higher temperatures, meaning warm air holds more vapor than cold air. Condensation occurs when air air packed with water vapor meets a colder surface. The sudden drop in air temperature causes water vapor to condense on the surface. It typically happens first to windows because they’re one of the least insulated components of your home.

Your daily activities, like cooking and showering, contribute to the moisture that’s generated in your home. The presence of condensation doesn’t necessarily mean that there are problems with your specialty windows. It can be a sign that your windows are tightly sealed, making it more energy-efficient. 

Minimizing Condensation

Condensation inside of windows is a result of high indoor humidity. Too much humidity in your home can cause mold or mildew growth and damage ceilings and walls due to moisture that can seep into the insulation, which can freeze and thaw. 

You can minimize humidity in your home by turning on exhaust fans in the kitchen while you’re cooking and in the bathroom while showering. Leave it on for 15 to 20 minutes after you’re done or until the bathroom mirror clears. Ceiling fans can improve air circulation.

Limit the number of indoor plants and aquariums. Place plants in a room that receives a lot of sunlight and don’t overwater them. Avoid keeping firewood inside your home and make sure that your attic and crawlspace are adequately ventilated. 

For quality installation of windows and doors, turn to Renewal by Andersen of Spokane. We offer some of the most durable and energy-efficient replacement windows and patio doors on the market. Call us at (509) 202-4090 or fill in our online form for a free estimate. We work with homeowners in Spokane, WA, and surrounding areas. 


"Thanks Tyler, Carlos, Chris & John for a GREAT and PROFESSIONAL job. Not only are the new windows and balcony slider great looking, but they are keeping us cooler (summer) and we are sure they will keep us warmer in the winter. We are very happy with our new windows. The “Anderson Gang” did a super job, from beginning to end. Other then being a “little late”, all went well. Your crew ROCKS .. thank you very much .. Dagmar and Glen Fisher"

Glen & Dagmar Fisher

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