Windows serve as visible areas for moisture to condense, warning you that there is too much moisture inside your home.  Windows do not cause condensation.

What is Condensation?

Condensation is the result of high humidity that produces a "fog" once it hits a colder surface. 

The humidity is caused by excess water vapor in the home.  This is commonly seen in a foggy mirror after a hot shower.  Condensation usually occurs first on windows because glass surfaces have the lowest temperature of any of the interior surfaces in the home.

What Causes High Humidity?

Humidity comes from excess water vapor in the air.  All homes have a certain level of moisture due to household activities.  Activities such as cooking, laundry and dish washing can add up to five pounds of water vapor into the air daily!  Other moisture-producing agents include plants, heating systems and humidifiers.

Seasonal changes, quick changes in temperature, reconstruction and remodeling can also add excess humidity temporarily into the air.  During construction, large quantities of water are displaced into the air from building materials such as concrete, plaster, taping, etc.  After one season of heating it will commonly dry out and your condensation problems will disappear.

Why Wasn't It Always There?

Old drafty windows allow moisture to escape through inefficient seals and cracks.   Today's technology produces more energy efficient, "tighter" homes.  This is great for keeping your home more comfortable, quieter, and cleaner, BUT by sealing your home you are also keeping moisture in.  In today's homes it is very easy to build up extremely high levels of humidity.

Does Condensation Depend on my Window Type?

Sometimes.  Recessed windows like bow and bay windows usually experience more condensation than other window styles.  This is because air circulated around those window types is usually more restricted, and since they hang away from the insulated house wall, bays and bows could be a few degrees cooler in temperature.  Placing a common electric fan near the window to produce air circulation may also be helpful.

Here Are Some Tips to Reduce Your Home's Humidity:

1. Be sure all ventilation to the outside is functional.  Use kitchen and bathroom exhaust fans.  Consider installing a laundry room exhaust fan.  Run exhaust fans while the humidity-producing appliance is operating or the humidity-producing activity is going on, and let them run a while after the activities have ended.

2. Air out your kitchen, bathroom and laundry room during or just after use. Because outside air usually contains less water vapor, it will "dilute" the humidity of inside air.  This takes place automatically in older houses through constant infiltration of outside air.

3. The process of heating your home will reduce the relative humidity - provided it's dry heat.  It will counter balance most of all of the moisture produced by modern living.

4. If you have a furnace humidifier or other humidifying device in your home, be sure it is adjusted to produce the proper amount of humidity, or turn it off.  The humidity produced elsewhere in your home may mean these devices are not needed at this time.

5. Be sure that louvers in attic or basement crawl spaces are open and that they are large enough.

6. Open the fireplace damper to allow an easier escape for moisture.

7. Install ceiling fans to keep air circulating within your home.

8. If troublesome condensation persists, see your heating contractor about an outside air intake for your furnace, venting of gas burning heaters and appliances, or installation of ventilating fans.

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