Why Am I Getting Moisture on My Windows?

When you look out of your windows and see moisture, naturally, you might assume it’s raining outside. There’s just one problem. The sun is shining and there isn’t a cloud in the sky. Upon closer inspection, you realize that the moisture you’re seeing isn’t on the outside of your windows, but rather, it’s on the inside. What gives?

Why Am I Getting Moisture on My Windows?

That moisture you’re seeing collecting on the inside of your windows and doors is condensation. Why is it forming on the interior of your windows? What can you do to reduce condensation or prevent condensation? Read on to find out.

What is Condensation?

In order to understand why moisture is forming on the interior of your windows, you first need to understand what condensation is.

Moisture in the air is always present. Typically, the warmer the air is, the more moisture it contains. Condensation forms when moist air makes contact with something that’s surface temperature is lower than the air temperature.

As soon as warm air meets a cold surface – or even colder air – it is unable to retain the same amount of moisture. Thus, the air has to release some of the water vapor that it contains. The moisture that is released is what is known as condensation.

Moisture on Window Interiors

As mentioned, the moisture that you’re seeing on the interior of your windows is condensation. Condensation can only really be seen when excess moisture forms on the surface of an object that is unable to absorb it.

Windows are non-porous, and thus, they cannot absorb moisture. However, the moisture can pool and create little beads or droplets of water; hence the moisture that you’re seeing.

Why Moisture Forms on Window Interiors

Now that you know that the moisture you’re seeing on the interior of your windows is the result of condensation and that it occurs when the humid air makes contact with a colder surface, let’s take a look at some of the reasons why you’re seeing moisture on the inside of your windows.

First, however, it’s important to note that condensation on the interior of your windows is more likely to occur during the winter months when the outdoor air is cold, and most people turn on up the heat in their homes. As such, the air inside your home gets much warmer than the outdoor air. Then, warm interior air circulates, making contact with the colder window glass surface, and condensation develops.

So why does this happen? Here are a few factors that could be contributing to the problem:

• Faulty window seals
• Poor-quality (low energy efficiency rating) windows
• High humidity levels inside your home
• Poor ventilation
• High indoor air temperature as a result of your indoor heat set too high.

If there are a lot of people in your house, condensation can occur on your windows, too. The more people there are, the more body heat there is. Believe it or not, body heat can increase indoor air temperature drastically. This results in condensation on the interior of your windows.

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