It’s important to maintain the proper humidity levels in your home and workplace to keep a comfortable, healthy space. Indoor humidity levels should be between 30 to 50 percent, with the ideal level being about 45 percent. UP. Keystone KSTAD70B. With a high efficiency in removing excess moisture from the air, during our tests being able to reduce it from 70% to a healthy 55% in only 4 hours, this Keystone entry is an obvious pick for those who are faced with the imminent danger of mold and mildew appearance as a result of an unhealthy humidity indoors. BENGOO Digital Indoor Humidity Monitor with temperature allows you to easily and fast check best conditions with its professional humidity and temperature sensors. Looking for the best home weather station on the market today? Our expert has revealed the top models in this buying guide with reviews & installation tips. The ideal humidity is to have a level between 40% and 50% for comfort and health. Let me show you how to do that! Learn more .