This Week’s Heat Wave Has Your Windows Sweating

If your windows have been covered in moisture this week, you’re not alone. After several days of Connecticut heat and humidity, plenty of homeowners have noticed foggy glass, water droplets, or condensation collecting on their windows. It’s one of those things that catches your eye and makes you wonder if something is wrong.

The good news? Sometimes it’s completely normal. When it’s hot and humid outside and your air conditioner is working hard to keep your home cool, moisture naturally forms when warm, humid air meets the cooler surface of the glass. During a stretch of weather like we’ve had this week, seeing a little condensation on your windows isn’t unusual. In fact, it’s often just a sign that your air conditioning is doing exactly what it’s supposed to do.

The trick is knowing when condensation is simply a byproduct of extreme weather and when it’s trying to tell you something about your home.

If the moisture disappears as the day goes on, you’re probably in good shape. But if your windows stay wet throughout the day, water is pooling on the sill, or you notice paint beginning to peel or wood trim feeling damp, it’s worth taking a closer look. The same goes if you start seeing mold, mildew, or that unmistakable musty smell around your windows.

One of the biggest warning signs is condensation trapped between the panes of glass. If you can’t wipe the fog away from either side, the insulated seal inside the window has likely failed. Once that happens, the window loses much of its insulating value, and replacement is usually the best long-term solution.

Sometimes the windows aren’t actually the problem at all. They’re simply the first place where excess moisture shows itself.

Everyday activities like cooking, showering, doing laundry, and even running the dishwasher add moisture to the air inside your home. During a humid week, that moisture has nowhere to go if your home isn’t ventilating properly. Basements can make the problem even worse, especially if they’re naturally damp or don’t have a dehumidifier running.

Fortunately, there are a few simple things homeowners can do to help. Run the exhaust fans in your bathrooms and kitchen during and after showers or cooking. If you have a dehumidifier, this is the time of year to put it to work, especially in the basement. Make sure your air conditioning system is clean, the filter has been changed, and it’s running efficiently. Even opening blinds and curtains during the day can improve airflow around your windows and help moisture evaporate more quickly.

It’s also worth taking a few minutes to inspect the weatherstripping around your windows and doors. Worn seals allow warm, humid air to sneak inside, making condensation more likely and forcing your air conditioner to work even harder.

If your home still has older single-pane windows or early double-pane units, they may simply be showing their age. Modern energy-efficient windows do a much better job of reducing condensation, improving comfort, and lowering energy costs throughout the year. While replacement isn’t always necessary, persistent condensation can be a sign that your windows are no longer performing the way they should.

This week’s heat wave won’t last forever, but it does offer a good reminder that our homes are constantly giving us clues about how they’re performing. Most of the time, a little condensation is nothing to lose sleep over. But when it becomes persistent, widespread, or starts causing damage, it’s worth paying attention before a small issue turns into an expensive repair.

Sometimes your windows are just reacting to the weather. Other times, they’re asking for help. Knowing the difference can save you a lot of headaches down the road.

Bob O’Donnell is the owner of O’Donnell Bros. Inc., a Bristol-based home improvement company established in 1975. Email your questions for Bob at info@odonnellbros.com with the subject line “Ask the Pro.” All questions may be considered for publication. To contact Bob for your remodeling needs, call O’Donnell Bros. Inc. at (860) 589-5155 or visit www.odonnellbros.com. Advice is for guidance only.