APPLY NOW: Special Financing With Approved Credit! Learn More
Replacement Windows

6 Simple Solutions for Controlling Indoor Humidity

2 min read

Common household condensation, or “sweating” on windows is caused by excess humidity or water vapor in the home. When this water vapor in the air comes in contact with a cold surface such as a mirror or window glass, it turns into water droplets and is called condensation. Occasional condensation, appearing as fog on the windows or glass surfaces, is normal and is no cause for concern.

On the other hand, excessive window condensation, frost, peeling paint, or moisture spots in ceilings and walls can be signs of potentially damaging humidity levels in your home. We tend to notice condensation on windows 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.

Do Windows Cause Condensation?

No. You may be wondering why your new energy-efficient replacement windows show more condensation than your old drafty ones. The answer lies in the seal of your new windows. Your old windows allowed air to flow between the inside of your home and the outdoors. Your new windows create a tight seal between your home and the outside. Excess moisture is unable to escape, and condensation becomes visible. Windows do not cause condensation, but they are often one of the first signs of excessive humidity in the air.

Where Does Indoor Humidity Come From?

All air contains a certain amount of moisture, even indoors. And many common things generate indoor humidity such as your heating system, humidifiers, cooking, and showers. Every activity that involves water, even mopping the floors, contributes moisture to the air. Condensation is more likely to occur in homes where temperatures drop below 35° F because greater temperature extremes are affecting the glass in the home.

It is normal to experience condensation at the start of each heating season. During the humid summer months, your home absorbs moisture. Then, when you turn on the heat, your house begins to perspire. This is only temporary. After the first few weeks of heating, your home should dry out, reducing, if not eliminating condensation.

The same scenario occurs during remodeling or building projects. 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 blocks the cold out, yet traps the moisture producing higher humidity levels and, more condensation.

6 Solutions to Control Indoor Humidity

  1. Ensure 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.
  2. 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.
  3. Check your humidifier settings. Use the humidity comfort levels provided in the table above to correctly set and balance the humidity in your home.
  4. 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.
  5. If you have a large number of house plants, try to concentrate them in one area and be careful not to overwater.
  6. 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.

Upgrade Your Home’s Windows with Window World of Joliet

Looking for window replacements for your dated, drafty windows? Find high-quality, energy-efficient windows that help cut costs to your energy bills by requesting your free estimate today.