How to Minimize Condensation on Windows

It’s not unusual to feel alarmed when you see condensation on your windows. In fact, many people regard condensation as a sign of a problem. But you might be glad to know that this is not the case. In fact, condensation can be minimized, if not altogether prevented. In this blog, replacement windows contractor Renewal by Andersen® of Portland discusses what causes window condensation, and how you can prevent it.

How Condensation Forms

Condensation forms when moisture in the air comes into contact with a cold surface. A cold glass of water left on the counter will eventually form condensation on the outer surface. The droplets don’t come from the contents of the glass, but from the surrounding air. The same principle applies when your eyeglasses become foggy after you leave a cold room.

Types of Condensation

Condensation on windows can form on the exterior, interior or between glass panels if your replacement windows feature a double-pane assembly. Knowing the difference is important as not all of them are indicative of window problems.

• Exterior Surface — Condensation on the window exterior typically forms during summer season, when indoor temperatures are much cooler that the outdoors. If you see it on your windows, it doesn’t mean that your window is leaking; in fact, this indicates that heat isn’t penetrating your insulated windows.
• Interior Surface — Condensation on the interior surface is common during winter, and again does not indicate a problem with your windows. It does, however, indicate an indoor humidity problem that needs to be addressed.
• Between Glass Panes — The space between double-pane glass is supposed to be sealed to minimize heat conduction, which is what makes such windows energy-efficient. If you find condensation between the glass panels, this means the seal has been breached, therefore the windows may likely require repair.

Addressing Humidity Problems

Winter is a dry season, therefore condensation shouldn’t happen unless there is an unknown source of moisture in your home. Address ventilation issues in areas such as the attic, bathroom, kitchen and basement. Check your HVAC settings, and make sure it’s not turning on and off too fast or short cycling. Check your indoor humidifier/dehumidifier, and make sure the settings are correct.

Renewal by Andersen of Portland is your leading provider of energy-efficient replacement windows. Give us a call at (503) 419-3960 or fill out our contact form. We serve customers in Tigard, West Linn and Beaverton, OR.