Normal humidity within a home should typically stay between 35 and 45 percent, depending on local temperature and climate. Various methods exist that help to either bring it down or up as needed.
Higher temperatures make higher levels of humidity possible. This is because warm air is capable of holding more moisture than cold air. Warm air has a stronger bond to water molecules, making the air feel drier and allowing more water to bond with air.
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Most homes should maintain a relative humidity below 50 percent at all times. This prevents mold and mildew growth, dust mite infestations, and condensation from building up in your home.
Any humidity of 30 percent or less is considered low and can be dangerous. Low humidity can cause breathing difficulties, discomfort and may damage a home's foundation.
Some resources for long-range weather forecasts include the Farmer's Almanac, the Weather Underground and the National Weather Service. These services also include past weather data as well as discussions of past and ongoing climate change.
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The recommended humidity level for a house normally ranges from 35 to 45 percent. At this humidity level, it is neither too dry nor too moist, which allows the residents to live comfortably. It also provides the best condition to keep the rooms and furniture from damage.
Humidity in a house can be decreased by installing extractor fans, opening windows to increase air circulation and installing insulation. Having good ventilation and raising indoor temperatures are two of the key objectives when trying to control humidity.
Forty-five percent relative humidity is the comfortable relative humidity level. Below 30 percent humidity, the air feels dry, and above 52 percent relative humidity, the air feels very moist.