Condensation on inside window surfaces of an insulating unit is not an indication that the glass or insulating unit is defective. Under the right set of conditions it is possible to get condensation.
•Inside window surface temperature falls below the dew-point temperature of the room.
•Poor air circulation within the home
•Room heating arrangements
•Open your windows as much as possible to allow the humidity to escape or purchase a dehumidifier, which greatly reduces the humidity inside a home.
•Vent clothes dryers, gas burners, etc. to the outdoors.
•Use kitchen and bathroom exhaust fans.
•Air out the kitchen, bathroom and laundry room during and after use by opening a window for a few minutes.Please refer to www.oee.nrcan.gc.ca for condensation prevention tips