Dry air is a common problem for many people, particularly during the winter months. The ideal humidity in your home should be around 40 to 60 percent. You can check you home's humidity level with a bit of simple science. Just fill a glass with ice water and wait three minutes to see if condensation forms on the outside of the glass. If not, your home is too dry. Fortunately, a home humidifier can improve your comfort and health in many ways.