Most frequently, this is seen on windows of a home in cold weather conditions. This also occurs in walls and attic systems, although this is not as readily visible as on windows. When it starts getting cold outside, and windows are starting to show signs of water condensing on the interior surface, this can be a problem. Here are ways to resolve these problems. First deal with the issue of dewpoint.
Every relative humidity has a dewpoint.
As we cannot realistically change the outside temperature, we must lower the relative humidity or raise the temperature of the glass. Operating a ventilation system, even a small bathroom fan, will decrease the relative humidity. Putting tight fit plastic over the interior surface of the glass will raise the temperature of that surface. In general we need to consider four sources of moisture in a home. Homeowner generated moisture is produced by bathing, cooking, breathing and wet cleaning.