Humidity in homes occurs by moist surfaces drying and that moisture evaporating into the air. Many items are constantly creating moisture and eventually evaporating into the air inside our homes and properties. A family of 4 produces approximately 25 pints of moisture per day during normal activities. Excessive moisture and humidity in a residential space can also result from any of the following if not properly controlled: Leaks, showering, hanging clothes to dry, boiling water for cooking, humid outside air, atmospheric conditions, breathing, improperly ventilated crawl space, not running the air conditioning during summer. Our self-contained, energy efficient IW25-4 in-wall dehumidifier is a reliable and proven way to manage humidity and excessive moisture in homes.