Humidity levels refer to the amount of moisture in the air, typically measured as a percentage. Ideal indoor humidity is between 30% and 50%. High humidity can lead to mold growth, wood rot, peeling paint, and dust mites, as well as discomfort due to the sticky feeling in the air. Low humidity, on the other hand, can cause dry skin, cracked wood, and damage to furniture or flooring. Both extremes can also affect the performance of heating and cooling systems. Maintaining balanced humidity helps protect your home’s structure, furnishings, and air quality.