Is There Moisture on Your Windows? Find Out What This Means

No matter what the season, moisture on your windows is a result of two intersecting factors: humid air contacting cool window glass. The results range from the annoying to the expensive. Sweating windows are often streaked and spotted and difficult to keep clean and sparkling. In addition, the window frames and sills become targets for mildew, mold and wood rot.

Why It HappensIs There Moisture on Your Windows? Find Out What This Means
Glass is an excellent heat conductor. Very often, the coolest exposed surfaces inside a typical home are in fact the glass installed in the windows. Condensation may occur when humidity accumulates in indoor air and household ventilation is minimal. As this warm air contacts the naturally cold glass, moisture on your windows forms on the inside of the pane. Outdoor condensation results from a high relative humidity outside contacting windows cooled by air conditioned indoor air. Conventional single-pane windows remain cooler than energy-efficient double-pane windows and are more likely to produce condensation. This is particularly true when single-pane windows are installed in aluminum frames. Aluminum increases heat loss from glass more efficiently than vinyl or wood, both of which have some insulating properties.

What You Can Do

  • When it forms on the inside glass, moisture on your windows can be combatted by increasing indoor ventilation.
  • Installing exhaust fans to spot ventilate kitchens and bathrooms that are primary contributors of interior water vapor may also help lower whole-house humidity.
  • Clothes dryers may emit humidity in the form of moisture from wet clothes in hot dryer vent air. Make sure the dryer is properly vented and not leaking exhaust air. Check the vent pipe for obstructions and clean lint out regularly.
  • Window insulation kits that include shrink film material to keep glass warmer are available at home centers.
  • If you’re using an indoor humidifier, make sure the setting is not too high.
  • Consider replacing older single-pane windows with the new energy-efficient double-pane variety. You’ll save on heating and cooling costs plus reduce condensation on your windows.

For more information on your heating and cooling needs, contact Amarillo Air Conditioning, your source of all-season home comfort for more than 50 years.

Our goal is to help educate our customers in Amarillo, Texas about energy and home comfort issues (specific to HVAC systems).  For more information about window moisture and other HVAC topics, download our free Home Comfort Resource guide.

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