Condensation Information

Width of the overall glass unit is 1 3/8" top rating in energy efficiency.

Why is there water on my new windows?

Water and/or frost on your windows is called condensation. Condensation happens when warn moist air comes in contact with cooler dry air. Just the way a cold can of soda will turn wet, or your mirror will steam up after a nice hot shower. Your windows can sweat the same way when there are temperature changes around them.

Does this mean my windows are defective?

Windows do not cause condensation, but because glass will generally have the lowest temperature in your home, it is the place that you will almost always notice condensation first. Just like the mirror or pop can, neither of which is defective or leaking, they are just a cool surface on which the moisture in the air will condensate on.

Why is this happening?

The moisture in the air is the real cause, the windows are merely the surface that the problem will show itself on first. As hard as this may be to understand, the fact that you see moisture on your windows is a great indicator that your windows are performing the way they should.


New windows are designed to hold the cold air out and retain the warm air inside your home. Unlike old drafty windows that allow moisture to escape with your heat, these new windows are trapping the warm air.

Are you saying it's a problem with my home?

With new home construction methods being more and more focused on energy efficiency, natural causes of moisture can be amplified. Normal day to day activities like cooking, showers and drying cloths can add moisture to the air that is not getting out of the house.

Is there anything I can do about this?

Absolutely, there are many things you can do to help control the humidity levels in your home, but the first step is to understand where this moisture is coming from.


In the summer the warm humid air is trapped inside the house. As the weather changes and you begin to warm the inside of the house, this moisture will begin to form on your windows. Building materials used also can add a lot of moisture to the air in newly constructed homes.


Okay, now I understand the cause, what things can I do to help?

While there is no sure fire 100% method of eliminating moisture from your home, nor would you want to, the following suggestions will help.

  • The use of a de-humidifier or the discontinuance of any humidifiers that you may have running. Many hot air heating systems have a humidifier built in.
  • Once a day crack a window or door to add cool dry air.
  • Opening your window treatments will allow more air to circulate around your windows.
  • Removing moisture from your basement can also help. This is a great location for a de-humidifier. If you have water present, you may want to take steps to waterproof your basement walls and floors.
  • Make sure that your cloths dryer is vented to the outside.
  • Check to see that all your bath fans are vented to the outside and try to use them whenever you shower.

Can excess moisture be a bigger problem than just annoying water on my windows?

Excessive moisture in a home can cause a number of issues. Should you see a build up of mold, mildew or fungus, we suggest you contact a professional heating/cooling contractor.


Other signs to look for would be rotting wood, wet spots on your walls and ceilings, or moisture on your exterior walls. Any of these issues can point to a more serious problem and you should seek the help of a heating and cooling professional.


Window condensation is generally limited to extreme temperature changes, and thus will lessen as the months change. During the winter heating season, the moisture will form on the inside of your windows. In the summer months, you may see condensation on the exterior surface.