Relative Humidity and Your Home

Unless you live in an arid climate, periods of high humidity create a myriad of problems for structures and people. Symptoms of high humidity would include:

  • A musty odor in your home, and/or basement and crawl space
  • Allergic reactions to mold and/or dust mites
  • Visible mold growth in your home, basement, and/or crawl space
  • Cupped wood floors
  • Feeling “sticky” or “muggy”
  • Visible condensation/water stains
  • Peeling wallpaper/blistering paint

What Should My Relative Humidity Be?

Every homeowner should own a hygrometer that measures temperature and relative humidity (RH). The ideal relative humidity for health and comfort is about 40–50%. In the winter months, it may have to be lower than 40% RH to avoid condensation on the windows.