Condensation is a normal occurrence on windows, and it can happen on new windows for a number of reasons:
Warm, moist air meets a cooler surface.
Condensation happens when warm, moist air comes into contact with a cooler surface, like window glass. This can happen on the inside of windows when the glass is colder than the air inside the home, or on the outside of windows when the air is warmer than the glass.
Windows are well-insulated
Condensation on the outside of new windows can be a sign that the windows are well-insulated. This is because the window’s surface temperature drops below the dew point, which is the temperature at which the air is 100% saturated with moisture.
Low-E glass
Low-E glass is a thin coating of metal that reflects heat and energy, keeping the glass temperature closer to the outside temperature.
Tight seals
Condensation can be a sign that your windows have good, tight seals. However, a tightly sealed home can also retain more humidity, which can lead to condensation.
Everyday activities
Activities like cooking, bathing, and breathing all contribute to the humidity in your home
