The ideal indoor humidity level for human health and comfort is between 30% and 50%, according to the Environmental Protection Agency (EPA). This range provides a good balance between comfort and protection for the home and its contents. Humidity levels that are too low or too high can lead to a variety of health problems, including dry skin, respiratory problems, and an increased risk of infection. By maintaining proper humidity levels in your home, you can help keep yourself and your family healthy and comfortable.