Having recently purchased a 1400 sq ft miobile home that retains moisture that causes mold and mildew, despite cleaning it with concentrated bleach and Pine-Sol, IU have had to add an air filter, 4 fans, a UV-C light to kill bacteria, a dehumidifier, and am using Calcium Carbonate, I am afraid the cos of running the dehumidifier is going to be too expensive over the long term.