How to Get Rid of Condensation Inside Windows: Seasonal Guide

Constantly spotting wet streaks or droplets appearing on your windows? It’s not just irritating when you want to see outside. Regular condensation can actually be a sign that your windows need attention – or even lead to mold.

Condensation varies by season, forming inside or outside windows. Let's understand why and explore seasonal solutions.

Why do my windows have condensation on the inside?

No matter the season, condensation forms when warm, humid air meets a cool surface – in this case, your window glass. The temperature difference causes the moisture from the air to condense into water droplets. Condensation on single-pane windows is more common overall compared to windows with multiple panes, as there’s just a single surface for air on either side to interact with.

In the fall and winter, interior window condensation is likely to occur. As the outdoor temperatures drop, the glass inside your home cools. When warm indoor air comes into contact with the chilly glass, condensation can form on the interior surface of your windows.

In the spring and summer, it’s the reverse; condensation on exterior windows pops up more often in these seasons. This happens when warm, humid outdoor air meets a cool window surface, typically caused by air conditioning inside the home.

While occasional condensation may not seem like a big deal, persistent moisture can be a serious red flag. It can indicate drafty windows that allow too much air exchange or excessively high humidity levels in your home. Left unchecked, this moisture can damage your windows and create a breeding ground for mold.

Managing condensation on interior windows in fall and winter

When chilly fall or winter weather blows into town, condensation inside windows becomes much more common. Here are a few effective ways to manage it:

1. Use a dehumidifier. Lowering your house’s indoor humidity can prevent excess moisture in your home from settling on windows. A portable dehumidifier works well for targeted areas, but a whole-house dehumidifier might be a better solution for widespread humidity issues. As a bonus, a dehumidifier could do wonders for making your home more comfortable.
2. Ventilate humid rooms. Rooms like bathrooms and kitchens generate a lot of moisture. Make sure to use exhaust fans when cooking, showering, or doing laundry to direct moist air outside.
3. Improve air circulation. Ceiling or portable fans can help circulate air throughout your home, preventing it from settling on cool window surfaces.
4. Upgrade to energy-efficient windows. Modern Window  with proper seals and double- or triple-pane glass insulate your home better, minimizing the temperature difference that causes condensation. If your windows are old or drafty, replacing them can make a big difference in reducing condensation (and potentially reducing your monthly utility fees).