With recent insulation requirements for glazing efficiency, the internal pane of the glass can have condensation issues. This is due to the temperature variation between the external and internal environment.
Water droplets occur depending on how much moisture there is in the home. For example, the steam from a kettle, drying washing, cooking, plants, or shower will naturally be absorbed into the air. When this water vapour comes into contact with a colder surface the air will be chilled.
Double and triple glazing can help to reduce the amount of condensation on the windows. However, it cannot completely eradicate the issue. If the air temperature within the room is low (not heated) and not well ventilated the air reaches a point when it becomes too saturated. This cooler air meets the colder internal glass and vapour will turn back into moisture. When this happens water droplets will appear on the glass.