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Home Humidity Levels

Home humidity levels should fall between 15% humidity and 55% humidity depending on a variety of factors including outdoor temperature and indoor home temperature.

Home Humidity Levels Chart

Outside Temperature Indoor Humidity Level
°F °C Humidity %
-20 -30 15%
-10 -25 20%
0 -20 25%
10 -10 30%
20 -5 35%
21+ 0+ 40%

Home humidity levels aren't always what the above chart suggests. In the winter, many homeowners keep the humidity levels in their home around 45% to 55%. In fact, the ACCA (Air Conditioning Contractors of America) suggest that maintaining a 45% to 55% humidity level year-round has many health and home benefits.

Home Humidity Symptoms

Not sure if you home is at the right humidity level? The best thing you can do is purchase a home humidity thermometer. That is the most accurate way to measure home humidity levels.

Aside from having a home humidity thermometer, you can also look for "signs":

Common Symptoms

High Humidity (Use Dehumidifier)

Low Humidity (Use Humidifier)

Allergic Reactions

Chapped Lips and Skin

Musty Odors

Respiratory Problems

Mold Growth

Static and Sparks

Stains on Ceilings and Walls

Scratchy Nose and Throat

Condensation on Windows and Mirrors

Damage to Electronic Equipment

High Humidity Levels And Your Home

If home humidity levels are too high, your health isn't the only that could suffer. The number one symptom of high humidity is mold and mildew. Humidity is the amount of moisture present in the air - mold and mildew grows from moisture - so with moisture comes mold and mildew.

It is important to remember that every room of your home has a different humidity level - and every level of your home has a different humidity level. So to help control home humidity, you need measure and control humidity in each room, on each level of your home.

To learn more about controlling humidity in your home, view our article on Waterproofing Your Home.

Basement Humidity

To control the amount of moisture in your basement, you need to control the amount of water entering in through your basement. To control basement humidity:

  1. Make sure basement windows and doors are properly insulated.
  2. Make sure your basement is free of cracks. If you have cracks in your basement walls and floors, use a DIY repair kit to repair them.
  3. Make sure your basement is sealed using a deep-penetrating waterproofing sealer.
  4. Make sure basement pipes are properly insulated.
  5. Make sure basement pipes are free of leaks and voids.


Home Humidity

To control the amount of moisture in each room of your home, you need to control the air flow and causes of moisture. To control home humidity:

  1. Make sure windows and doors are properly insulated and that there are not voids between your windows and the wall, and your doors and the wall.
  2. If you hang your clothing to dry, open a window while doing so.
  3. Turn the fan on when you cook and when you shower.
  4. Use a dehumidifier when your home is too humid and a humidifier when your home is too dry.
  5. Seal your basement and make sure your basement is free of cracks.
  6. Look for evidence of leaking pipes (wet walls, wet ceilings).
  7. Look for evidence of a moisture problem (condensation on floors and walls).
  8. Use a mold test kit is you suspect you may have a mold or mildew problem.
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