Condensation on the Windows? What it Could Be a Sign Of

If you’re noticing condensation on the windows in your home, don’t blame the windows. Water vapor naturally condenses wherever air contacts cooler surfaces. Because glass transmits heat energy very efficiently, windows are typically the coolest surface in your house. Excess condensation on the windows is usually related to high indoor humidity levels rather than an issue with the windows themselves.

Condensation on windows causes fogging that obscures a clear view of the outdoors. It also leaves streaks that require frequent cleaning. However, wet windows are the source of more than just annoyance. Condensation dripping off the glass onto components such as the sash and sill causes wood rot, warping and makes windows difficult to open or close. In addition, chronically wet windows form a breeding ground for mildew and even toxic mold growth.

To reduce condensation on the windows, address indoor humidity issues.

  • Humidity reduction is part of the air conditioning process to make the home feel more comfortable. For that reason, your A/C is also helpful to limit condensation. Make sure your air conditioner is operating up to manufacturer’s specifications. Annual preventive maintenance by a qualified professional is critical to ensure that A/C components like the evaporator coil, which extracts water vapor, are clean and fully functional. Also, change the air filter monthly yourself to ensure adequate airflow
  • Where outdoor humidity makes it hard to maintain indoor humidity to recommended levels, consider installing a whole-house dehumidifier. Installed inside your HVAC ductwork, the unit continuously removes water vapor from household air as it circulates through the ducts to maintain a consistent humidity setting in all living spaces.
  • Install exhaust fans in the kitchen and bathrooms to vent humidity produced in these rooms out of the house before it migrates throughout the entire home.
  • Make sure your clothes dryer is properly vented to the exterior of the house and that the vent hose isn’t clogged with lint or leaking. Drying clothes adds a large quantity of water vapor to indoor air.

For professional service to resolve the causes of condensation on the windows, contact Apollo Home Heating, Cooling, Electric and Plumbing.

"Ernie & Mike did a superb job on my new furnace and A/C installation. Despite having more than a day’s work to do, they came in and stayed until the job was done. They were organized, efficient, and protected the rest of the house well. Got both furnace and A/C installed the same day. Ernie was courteous, informative, and clearly knew his job better than anyone I’ve encountered before. The units look so good guests now get The Tour of our new system. Apollo is clearly not a fly-by-night company. I would recommend them to anyone in need of a new furnace and/or A/C."
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- Randy B.
"We scheduled an estimate AND a tune-up. We knew something was wrong with our furnace, but hoped we could make it through the rest of the season. Upon telling Bill what our furnace was doing, he warned us immediately what the possible outcome was going to be; a cracked heat exchanger. He watched the flames roll backward, tested carbon monoxide levels, which were so high they meter’s last reading was 5,600 before saying “high”. He immediately shut it down, tagged it, and explained that with levels that high and children in our home he wanted off right away. He continued his inspection and showed us via a camera that not only was it cracked in multiple places, but had holes all over it. He gave us a few options for repairing it; his knowledge as well as genuine concern was beneficial and refreshing. Luckily we also scheduled an estimator, Micah, to come too and we were able to get costs between repairing and replacing (with several options). We decided to replace with a much higher efficiency furnace and one sized properly to our home. Hands down, not only did they both provide us great service and knowledge, but without sounding dramatic, they may have saved our lives. This was our first time calling Apollo, but it won’t be our last."
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