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Why Your Windows Fog Up in Winter and How to Prevent Moisture Buildup

Winter Foggy Windows Causes and Prevention Tips

People who live in Vancouver are accustomed to rain, grey skies, and damp weather. But there’s one part of winter that can be extremely annoying for homeowners. No one likes to wake up and pull back their curtains to find their windows covered in a layer of water or fog. While this common problem might seem like a mere nuisance, it can lead to bigger issues if you ignore it. Water sitting on your window sills can damage the wood or drywall and even lead to mould growth.

If you’re dealing with foggy windows winter after winter, Beck Glass can help. This guide will highlight the reasons for foggy windows, what you can do to prevent this problem, and when to consider residential glass repair or replacement.

Close-up view of fog on a window glass during winter in Vancouver, BC

What Is Condensation on Windows?

To understand why your windows get wet, you first need to understand condensation. The idea is actually quite simple. Air holds water in the form of vapour. You cannot see it, but it’s always there. Warm air acts like a big sponge, meaning it can hold a lot of water vapour. Cold air is different, as it cannot hold as much moisture. When warm, wet air comes into contact with a cold surface, it cools rapidly. Because the cooled air shrinks, it must release the water, which then turns from a gas back into a liquid.

Think about a cold can of soda on a hot summer day. Water droplets form on the outside of the can when the cold metal cools the warm air around it, and water sticks to the surface. This is exactly what happens to your windows. In the winter, the glass is cold because of the freezing air outside. The air inside your home is warm and cozy. When that warm indoor air hits the cold glass, it releases water in the form of condensation.

Common Causes of Condensation and Foggy Windows During Winter

In a typical home, you’re adding water to the air all day long without even realizing it. Some of the primary reasons for condensation on windows in Vancouver are:

  • Daily Activities – Simply living in your house can create moisture. Every time you take a hot shower, boil a pot of pasta, or run the dishwasher, you’re adding steam to the air. Even breathing adds water vapor. A family of four can add gallons of water to the air every day just by breathing and cooking.
  • Poor Ventilation – Newer homes are built to be very tight. This is good for saving energy because it keeps heat inside. However, it also traps stale, moist air. If the moist air has nowhere to go, it will find the coldest surface – usually a window – and stick to it.
  • Temperature Differences – The bigger the difference between the temperature outside and inside, the more likely you are to see fog. If you keep your Vancouver home warm on cold nights, the glass becomes a battleground between two temperatures.
  • High Humidity – The air in Vancouver is already damp. If you bring it inside and then add more moisture from showers and cooking, your indoor humidity levels can get too high. If they exceed 50%, you’ll likely see water on the glass.

Tips to Reduce Condensation on Windows in Vancouver

Dealing with wet windows can be frustrating. The good news is that you can often resolve the issue by adjusting how you manage the air in your home. You must lower the humidity and keep the air moving. Try these simple tips to keep your glass clear:

  • Use Your Fans – This is the easiest fix. Whenever you cook on the stove, turn on your range hood fan and leave it on for 15 minutes after you finish cooking. Do the same in the bathroom. Turn on the exhaust fan when you shower and leave it running until the mirror is no longer foggy. These fans suck the moist air out of your house before it can settle on your windows.
  • Buy a Dehumidifier – If your home feels damp all the time, you might need a machine to help. A dehumidifier removes water from the air. It collects the water in a bucket that you then pour out. Running one of these in the main living areas during the winter can make a huge difference.
  • Open the Curtains – Heavy drapes and blinds can trap air against the cold glass. This creates a little pocket of cold air where condensation loves to form. Open your curtains during the day to let air flow across the glass. This helps warm up the window and dries off the moisture.
  • Move Your Plants – Houseplants look great, but they also release water into the air. If you have a lot of plants sitting on your windowsill, they might be causing the fog. Try moving them a few feet away from the glass during the coldest months.
  • Circulate the Air – Stagnant air is bad for windows. Use ceiling fans on a low setting to push warm air down and around the room. The more the air moves, the less likely it is to dump water on your cold windows.

When to Replace Your Insulated Glass

Moisture inside double-pane windows is a different problem that signifies your window is broken. Most modern windows have two panes of glass with a space in the middle. This space is filled with a special gas, usually argon, that helps keep your home warm. A seal holds the gas inside and keeps moisture out. Over time, this seal can get old and crack, allowing moisture between the two pieces of glass, where it gets trapped and turns into fog or water droplets. Among the common window seal failure signs are:

  • You cannot wipe the fog off because it’s between the panes
  • The glass looks milky or hazy in the center
  • You see tiny water droplets inside the glass unit
  • Your room feels drafty or colder near the window

If you notice these problems, you must fix the glass to keep your home warm and your view clear. In most cases, you can replace the glass unit itself instead of ripping out the whole window frame. Knowing when to replace insulated glass can save you money on your heating bills.

Beck Glass Specializes in Residential Glass Repair and More

If you’re tired of looking through foggy glass, Beck Glass can help. Our locally owned company understands the unique weather challenges in Vancouver, so we’re able to provide reliable residential glass repair in the area. We’ll first visit your home and examine your windows to determine if the condensation is a humidity issue or if you have a broken seal.

If your sealed unit has failed, we’ll measure it and order a new one that fits perfectly into your existing frame. We handle all types of glass, from standard windows to patio doors.

Contact Our Experts in Vancouver Today

If you have fog between your window panes or are worried about water damaging your windowsills, rely on the specialists at Beck Glass for honest advice and high-quality work. Contact us today to schedule an appointment.

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