Windows are normally relied on for general ventilation and whenever possible the windows nearest the source of moisture should be opened.  Opening a window in each room for 10 minutes three to four times a day allows the stale, humid air to escape and fresh, dry air to enter.
  You see, the basic principle of reducing window condensation is extremely simple.  When there's too much condensation on your windows, it means that humidity is too high for the good of your home.  The problems can be solved by controlling the causes of moisture in the air and by replacing moist air with dry fresh air.
  There are other methods of control, also.  Higher temperatures means that more water vapor or humidity can exist in a given space.  Therefore, controlling the temperature within the room will somewhat control the amount of moisture in the air.  Mechanical dehumidifiers are available if you want to consider investing approximately a hundred dollars.
  Installation of storm windows allows you to maintain a higher level of humidity in the home without condensation.  The principle involved here is one of reducing the contrast in the surface temperature of windows and the air in the room.  The second piece of glass and the "dead" air between acts to insulate the interior glass from the cold outside.  The temperature of the air contacting the protected window is not reduced as much and it is less likely to reach its dew point.  This, of course, reduces window condensation, but does not eliminate the problem of too much moisture in your house.  Your condensation problem may be still present, but in areas less visually noticeable such as the space between walls or between the ceiling and the roof.
How to lick your condensation problem
1.  Recognize that the only way to stop condensation is to reduce the moisture in the air in your house.
2.  Regularly bring in a reasonable amount of dry outside air through ventilation.   Air out rooms daily.  Always use exhaust fans and ventilators when cooking, bathing, or washing...use them more often and leave them on longer than has been your custom.
3.  When possible, control sources of air moisture.  Shut off furnace humidifiers and other humidifying devices.  Always mix hot and cold water as they come from the faucet.
4.  Don't maintain excessive room temperatures within the home.  Sixty-eight degrees is very comfortable.
5.  Install storm windows.
6.  Make use of a small de-humidifier.
7.  If troublesome condensation persists, see your heating contractor about an outside air intake for your furnace, about venting of gas burning heaters and appliances or about installation of ventilating fans.

Please Don't  Blame Your Windows for Winter's Condensation

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