The term "basement humidity level" refers to the moisture content of the air in a basement. A humidity level above 80 percent encourages mold and mildew development, according to Basement Health Pros. The ideal humidity level for a basement is around 50 percent.
Installing a humidifier helps reduce basement humidity. Keeping the basement at a moderate temperature is also important, particularly in areas with cold winters. Cool air is more humid than warm air, and repeated drastic temperature changes promote mold and mildew growth. Maintaining a temperature of at least 58 to 60 degrees Fahrenheit reduces this problem.
Basement carpeting does not directly affect the humidity level, but it does collect mold spores. Removing the carpet makes it more difficult for mold and mildew infestations to occur.