Why do my windows keep fogging up in the winter?




Interior window condensation or “fogging” occurs when excessive moisture builds up inside a home and that warm air meets a cold window – that’s when condensation or “fogging” occurs.

Many times, window condensation can be a sign of several issues:

  1. The humidity level in your home is too high
  2. Significant moisture has been generated in your home over a short period of time due to events such as cooking, multiple showers, etc.  If the condensation dissipates within a few hours, this is nothing to be concerned about, however, if it remains, it could be a sign of a more significant issue
  3. Insufficient air flow and circulation throughout your home
  4. Windows or doors could have an issue and are not sealing tightly

Here’s a few things you can do to eliminate window condensation:

  1. Turn down the humidity in your home by 5-10% and allow 24 hours for your home to adjust
  2. Turn on your furnace fan to help circulate the air more efficiently. A new furnace with the proper thermostat will give you the ability to adjust the speed of your circulation fan – which is very convenient.
  3. Use bathroom and kitchen fans to help exhaust humid interior air
  4. Check the humidifier on your furnace to see if it’s operating properly or call in an Energy Clean certified technician to service it and ensure its operating correctly.
  5. Open your blinds or drapes to allow warmer air to circulate away from the windows.
  6. Buy and use a portable dehumidifier or install a central dehumidifier.
  7. Open your windows for a few moments, if the outside temperatures are not prohibitive.
  8. Check and possibly replace the weather stripping around your windows and doors
  9. Use storm windows and doors if you don’t already have them
  10. If the problem is ongoing, consider purchasing an air exchanger (HRV, ERV) for your furnace by speaking with an Energy Clean Home Services Comfort Specialist
  11. Move your plants away from windows – plants generate moisture and therefore aid in the humidity process which can fog your windows

Choose Waterloo Energy Products

We are your one-stop solution for all your HVAC needs. We sell and install Trane Heating Systems. Give us a call and speak directly with our Trane Comfort Specialist.

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