How do I reduce humidity levels in my home?

In order to decrease humidity levels in your home and prevent moisture problems, you will have to produce less humidity and increase the ventilation of your home. The following is a list of suggestions to reduce humidity levels in your home:

• Be aware of sources of moisture in your home (plants, aquariums, steam showers, cleaning, washing, cooking, etc.) and compensate with sufficient ventilation.
• Ensure that your home has appropriate exterior water barriers to protect your home from outdoor moisture.
• Your kitchen and bathrooms should have ventilation fans to expel indoor moisture. Many older ventilation fans make noise but are ineffective at actually ventilating your home. A simple way to test that your fan is functioning sufficiently is to take a single square of toilet paper and place it along the fan vent while the fan is running. If the fan does not hold up the toilet paper, it is not functioning properly.
• Consider installing a humidistat for your bathroom ventilation fan, or ensure that you run the fan for at least 15-20 minutes after each shower.
• Fix all water leaks into the basement and do not allow any standing water in the house or against the foundation wall.
• If necessary, repair or replace the drainage tile around your home or install a sump pump to remove excessive moisture from the soil under the slab. Speak with a knowledgeable contractor about the best option for your home.
• Disconnect any humidifiers (if unnecessary).
• If required, use a dehumidifier.
• Do not store and dry wood in the house, and avoid hang-drying laundry in the house, as it releases moisture into your indoor air.
• Ask your energy advisor or contractor about which home energy improvements will help reduce the humidity of your home.

Did you see a building science or energy efficiency term you did not understand? Check out our glossary.