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Common household condensation, or “sweating” on windows is caused by excess humidity or water vapor in the air comes in contact with a cold surface such as a mirror or glass window, it turns to water droplets and is called condensation. All homes have occasional concern.
On the other hand, excessive window condensation, frost, peeling paint, even moisture sport on ceilings and walls can be signs of excessive condensation and potentially damaging problems in your home. We tend to notice condensation on window and mirrors first because moisture doesn’t penetrate these surfaces.

Yet they are not the problem, simply the indicators that you need to reduce the indoor humidity of your home.

Conquering the myth. Windows do not cause condensation.

You may be wondering why your new energy-efficient replacement windows show more condensation than your old drafty ones. Well, your old windows allowed humidity to escape. Now that your new windows create a tighter seal, the extra moisture in your home is unable to escape, therefore making you more aware of excess humidity. Windows do not cause condensation, instead they prevent humidity from escaping and provide an easy surface for condensation to collect.

Where does indoor humidity come from

All air contains a certain amount of moisture, even indoors. And there are many common things that generate indoor humidity such as your heating system, humidifiers, cooking and showers. In fact, every activity that involves water, even mopping the floors, contributes moisture to the home.

Condensation is more likely to occur in homes where January temperatures drop below 35F because there are greater temperature extremes affecting the glass in the home.

It is very normal to experience condensation at the start of each heating season. During the humid summer month your home absorbs moisture and then perspires when you turn on the first few week of heating your home should dry out, reducing if not eliminating condensation.

You’ll notice the same remodeling or building. Due to the high levels of moisture in wood, plaster and other building materials, your home will temporarily sweat during the first few weeks of the heating season.

Another factor in the condensation equation is progress. With today’s modern insulation, moisture-barrier materials and air-tight construction, we all enjoy a more thermally efficient home-one that block the cold out, yet traps the moisture in producing higher humidity levels and…. more condensation.

Reducing humidity is the key.

The best way to reduce condensation is by eliminating excessive humidity. So, how much humidity is too much? The following table illustrates the recommended comfortable levels of indoor humidity during the winter months.

OUTSIDE TEMPERATURE	INSIDE RELATIVE HUMIDITY
-20°F	15 to 20%
-10°F	15 to 20%
0°F	20 to 25%
+10°F	20 to 30%
+20°F	30 to 35%
(Indoor humidities can be measured with a humistat or psychrometer.)

By eliminating ecessive humidity in your home you may very well eliminate most, if not all, of your condensation problems.

Six simple solutions to controlling indoor humidity.

*	Make sure all sources of ventilation to the outside are functional, and use kitchen, bathroom and laundry room exhaust fans during and after humidity-producing activities to vent excess moisture.
*	Air out your home periodically. Opening windows for just a few minutes a day lets the stale moist air escape and the fresh dry air enter without compromising your heating.
*	Check your humidifier setting. Use the humidity comfort levels provided in the table to correctly set and balance the humidity level in your home.
*	Be sure that all louvers in the attic or basement are open and large enough. You can even open your fireplace dampers to allow excess moisture to escape.
*	If you have a large amount of house plants, try to concentrate them in one area and watch over watering.
*	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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