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A. An early indication of high humidity levels in your home is condensation on windows. Because they are usually the coldest surface exposed to room air, they fog up first. By taking action to reduce condensation on windows, you should be able to avoid condensation problems from occurring inside the walls. Occasional condensation or frost on windows is normal. Frequent occurrences, or periods of prolonged duration, are warnings that inside humidity conditions may be causing condensation inside wall cavities.

A musty odor or buildup of mold in the house is another sign of high humidity levels.

Inexpensive color-change relative humidity indicators can also reveal high moisture levels. These should be installed near the thermostat.

On a positive note, a certain amount of humidity in the home can help prevent dry throats and make people generally feel more comfortable because less moisture evaporates from the body thereby reducing the cooling effect. Also, higher humidity levels results in less static electricity and improved furniture maintenance as wood moisture is maintained reducing cracking and shrinkage.