Get your foggy window fixed or replaced.
To find out perform a preliminary fogged window check:
Looking at your fogged window; is the moisture on the outside, inside or in between the double glass pane? This will help identify where the moisture if coming from to begin with.
Moisture on Outside of Window
If there is moisture on the outside of the window this has occurred because the temperature outside is higher than inside. This can happen on hot humid days. When a large difference between these two temperatures occur is when the outside fog occurs.
Moisture on Inside of Window
If there is moisture occurring on the inside of the window this is due to a lower temperature outside and a higher temperature inside accompanied by indoor condensation. Implementing a dehumidifier may alleviate the indoor window fog in this case.
Moisture In Between Double Pane or Dual Pane Window
If the moisture is getting trapped inside of your window, in between the panes this is most likely due to a broken window seal. As a window ages the seals often crack and break, allowing moisture to get trapped between the double panes. Typically window seal failure occurs on windows that receive the most sunlight because the sun exposure wears down the window seal more quickly.
Fogged Window Solution
In some cases we are able to repair the window to stop it from fogging. If this is possible we will recommend the repair path before replacing the window. If the window is past the repair stage then replacing the fogged window is the best solution. Choosing the right window replacement is key to providing you with long lasting windows that insulate properly and weather the effects of the sun.