What Causes Condensation? Interior Condensation


Do windows cause condensation? Why have I got condensation on my windows?  What can I do to stop interior condensation?  These are all questions that get asked, especially around the end of fall and the beginning of winter as the temperature drops significantly and people notice the environmental changes and sometimes the appearance of moisture on their windows.

Interior Condensation

The first question to ask is where is the condensation?  Test this with a towel – see if it is on the inside or the outside of the window – if it’s neither and the condensation is between the glass panes then it would indicate seal failure of your insulated glass unit.  This would require the IGU to be replaced and you should call your authorized dealer or contractor to follow up – all Climate Solutions windows and doors are warranted with a lifetime warranty against seal-failure.

If the condensation is on the inside of the window it is a sign that the humidity is too high in the home.   Interior condensation isn’t uncommon – think of the mirror in your bathroom when you take a shower – moisture will appear on it because the air is simply too humid and has reached its dew point – or the point at which condensation forms.

There are many factors that can spur temporary condensation, such as steam producing products/activities (laundry, dish washing, cooking, showers, baths), the start of the heating season (houses absorb moisture during humid summers), sharp drops in temperature and during new construction (as new construction materials contain a lot of moisture that is released during the first heating season).

Problem condensation is repeated condensation that can lead to health problems and dirty vinyl windows – this would be if the condensation doesn’t disappear or if it is elsewhere in your home, such as the walls.

The biggest way to cure interior condensation is to make sure the humidity in your home is relative to the outside temperature – if it is -20°F then you want to keep humidity below 15%, if it is +20°F then the humidity can be as high as 35%.  Combine this with ventilation and you will be sure to reduce condensation in your home.
Finally, from the Better Business Bureau:
“Condensation is visible evidence of excessive moisture in the air. It may appear as water, frost, or ice on the room surface of windows and doors….you must remember: Windows do not cause condensation. Therefore, windows cannot cure condensation”

Please feel to call us at 847.233.9800 and will be happy to answer any questions you have in regards to becoming a Climate Solutions Certified Dealer, or head to our Contact Form online.