Chicago Window Expert

Nobody knows more about windows.

  • By Mark Meshulam

    Do you have window condensation or frost? Did the weather suddenly get cold?

    If you have wondered whether window condensation correlates with a sudden snap of cold weather, take a look at this chart. The inset chart shows Chicago temperatures for the week of November 18-26, 2013. Note the big temperature drop on Sunday. Now look at the traffic on Window Condensation: Top 10 Fixes during the same period. There was about a 500% increase in web traffic from earlier in the week.

    Window condensation increases when temperature drops

    Web traffic for article "Window Condensation: Top 10 Fixes" plotted against Chicago temperatures. The temperature dropped from 30 deg to 12 deg from Friday night to Sunday morning. Web traffic increased about 500%

    It happened again in cold snap #2

    To show you this isn’t a fluke, it happened again. The temperature in Chicago suddenly dropped between December 5 to December 7, 2013 from 57 deg F to 9 deg F. A 48 degree drop in only two days! No wonder we Midwesterners are hearty and resilient, or is it stupid for living here?

    The second Chicago cold snap in 2013 produced the same web traffic results as the first one

    The second Chicago cold snap in 2013 produced the same web traffic results as the first one. As temperatures dropped, people scurried to search online for solutions to their window condensation problems. And our article "Window Condensation: Top 10 Fixes" was waiting with useful information.

    It happened again in cold snaps #3 and #4

    On January 3rd we had a baby cold snap at around 0 deg F, but it was enough to show up on our analytics. But when the mother of all cold snaps happened on January 6 and 7, with temperatures around minus 15 deg F, our traffic on the window condensation article broke records at around 200 page views for each day. Time on page for the first ten days of January topped 5 minutes per view, which in our ADHD society equates to moving in with suitcases and staying overnight.

    Chart of temperatures of historic cold snap of  January 6 and 7, plotted against web traffic of chicagowindowexpert.com "Window Condensation: Top 10 Fixes"

    When the historic cold snap occurred in Chicago, and much of the rest of the US on January 6 and 7, people flocked to chicagowindowexpert.com to read “Window Condensation: Top 10 Fixes”

    Was it only Chicago?

    Thanks for asking and of course not. The cold wave swept North America. Our analytics told us the regions that sent us the most traffic, so we plotted it on a chart for your edification:

    States experiencing low temperatures sent readers to our window condensation article for help. Looks like the folks in Minnesota were too frozen to read the article once they found it

    Many states experiencing low temperatures sent readers to our window condensation article for help

    Why does window condensation and sudden cold weather go together?

    When temperatures are moderate, the air is capable of holding much more water in a vapor state, so the outside humidity is elevated. This moisture makes its way inside through the building envelope. When the temperature suddenly drops outside, the elevated humidity inside the building changes to a liquid state when it comes in contact with the suddenly cold windows, wetting them. This is condensation formation on the windows.

    Window condensation can subside after you remove some moisture from the inside environment by wiping the windows dry, and then when the inside air dries further because the outside air becomes dryer.

    Condensation can seriously damage wood windows. Don't let windows get wet

    Interior condensation on wood window sash (left) can cause the paint to peel and even rot the wood itself (right). It is important to be proactive to avoid condensation damage to windows

    Aluminum windows can have more pronounced condensation on the frames because frame temperatures are often lower than on wood windows. Aluminum windows do not tend to self-destruct the way wood windows can, however condensation overflow can harm adjacent finishes such as wood floors and drywall.

    Condensation on aluminum window

    Aluminum window frames can get colder than wood frames, so they often show a greater volume of window condensation.

    To be proactive in controlling window condensation, read this article:
    Window Condensation: Top 10 Fixes

    Outside humidity and comfort

    Your comfort in cold weather is also related to outside humidity. Before the cold snap, you could be really cold outside in 30 degree weather because the water vapor air in the air carries the heat away from your body much more readily than does dry air. After the cold snap, the outside humidity is much less, so it carries your body heat away less. You can feel warmer in 20 degree dry air than in 30 degree humid air. Sounds like people from Phoenix who proclaim the merits of dry heat whilst they shrivel to a prunelike state.

    Then there’s the effect of the wind, but that’s yet a different subject.
    Read about it here: Wind Loads and Windows for the Very Windy City


    Very cold weather causes window condensation

    Mark Meshulam, Chicago Window Expert knows what it means to be COLD!


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After passing the static water test, we move on to the dynamic water test. Instead of pulling pressure from the chamber, we use an airplane engine to propel the water spray at the skylight. It makes a lot of noise and shakes the skylight. This test also runs for 15 minutes. Witnesses are inside the chamber during this test. For first-timers, it can be memorable having that propeller cranking away so close to you.