There are three main factors that cause window condensation; cold outdoor temperatures, excessive indoor humidity, and window surface temperatures that are lower than the dew point of the air inside your home. The dew point is the temperature at which moisture in the air begins to form into visible water drops. In the case of windows, if the glass surface falls below the dew point of the air, water droplets will begin to form on the glass.
The higher the humidity, the sooner the condensation will form as the temperature falls. For instance; if the relative humidity in your home is approximately 40 percent, window condensation will form on single pane glass when the outdoor temperature falls below 40 degrees. Conversely, if the humidity in your home is only 15 percent, the outside temperature would need to fall to minus 20 degrees Fahrenheit before condensation would form on the inside of the glass.
How to Combat Window Condensation
Install Insulated Glass Windows: The best solution for eliminating condensation on the inside of the windows in your home is to install high-end insulated glass windows that are filled with argon or krypton gas. A great example of this is the Cardinal Glass Endur IG line. The Endur IG features a rugged, Polyisobutylene seal which is UV resistant and offers an exceptional barrier for the Argon gas.
Windows With Warm Edge Technology: Take your battle with window condensation to yet another level by investing in windows with warm edge technology such as the Cardinal Glass XL EDGE Insulating Glass. With the lowest failure rate in the industry, it is no surprise that Cardinal Glass offers an industry leading 20-year warranty on the XL EDGE.
Exhaust Fans: Even the best windows on the market are no match for extreme moisture caused by taking a hot shower or cooking in a small kitchen. To evacuate this moisture run your exhaust fans while cooking or taking a shower. It’s a good idea to let the fan run for an extra 10 minutes to remove most of the moisture from the room.
Ceiling Fans: Circulating the air in the room can reduce the amount of window condensation on your windows. Run the fan in reverse in the winter months to pull the warm air near the ceiling back down to floor level.
Relocate Your Plants: Yes, your plants enjoy the sunlight when they are placed adjacent to a window. However, they do release moisture into the air. Relocating plants, even just a small distance from the window, can help to reduce window condensation.