Why Do my New Windows Have Condensation on the Outside?
And Why It's Not a Bad Thing
At a Glance
As temperatures rise and we begin to move into spring here in Western New York, you might start noticing condensation on the outside of your new windows. “This never happened with my old windows,” you might be thinking. So why is it happening now? Exterior window condensation is a common occurrence with newer windows in springtime, but don’t worry! This means they’re doing what they’re supposed to.
Why Do my New Windows Have Condensation on the Outside?
And Why It's Not a Bad Thing
At a Glance
As temperatures rise and we begin to move into spring here in Western New York, you might start noticing condensation on the outside of your new windows. “This never happened with my old windows,” you might be thinking. So why is it happening now? Exterior window condensation is a common occurrence with newer windows in springtime, but don’t worry! This means they’re doing what they’re supposed to.
Condensation occurs when water vapor in the air cools and changes to liquid water. This typically happens when it comes into contact with a cold surface. Warm air can hold more water vapor than cold air, so when air rapidly cools, its ability to hold moisture decreases. This forces the excess water in the air to turn liquid.
Think of steam on your bathroom mirror after a shower, or moisture on a cold can of soda. The same principle applies to your windows!
When condensation forms outside your windows in the morning, it's no different than morning dew. When your window glass is cooler than the dew point (the temperature at which water vapor turns into liquid), condensation appears on the outside of your window. You might notice this more in spring and fall, when chilly nights are followed by warmer days.
With newer, more energy-efficient windows, exterior condensation is a sign that they are functioning correctly.
Older windows leak heat, warming the outer glass. Your new windows, which are made with low-e glass (or “low-emissivity” glass), better retain that heat. Double pane glass is insulated with Argon gas between the panes, so the outer pane stays cool enough for condensation to form.
In other words, exterior condensation is a sign of excellent insulation performance.
No - exterior condensation on new windows is completely normal. In fact, it’s a visual confirmation that your windows are insulating properly and effectively keeping heat inside.
If condensation were forming inside the glass panes, or inside your home, that would be a different story. Interior condensation could be a sign that your humidity levels are too high indoors, which could lead to mold and rot.
But exterior condensation, on the other hand, is completely normal and temporary. It should resolve as the sun warms your windows.
If you’ve recently upgraded to energy efficient windows, exterior window condensation on spring mornings is totally normal. It’s a natural result of improved insulation, temperature differences, and changing seasons.
So, if you notice it, don’t fret! Your windows are doing their job.
Frequently Asked Questions
Exterior condensation is completely normal and is a sign that your new windows are properly insulating.
Condensation on the outside means that the glass is cooler than the ambient air. When your window glass is cooler than the dew point, condensation forms.
Condensation or moisture between the glass panes could indicate a seal failure. If you believe you are experiencing a seal failure, contact our service department for an assessment. If you have questions or concerns please reach out at (585) 254-8191 or write in to our service team https://www.rochestercolonial.com/contact-us/
Window condensation resolves as the sun warms the glass, usually within a few hours.
