What is the ideal range for indoor relative humidity during winter?

The ideal range for indoor relative humidity during winter is typically between 20% and 40%. This range provides a comfortable living environment while helping to prevent various issues associated with both low and high humidity levels.

In the winter, when outdoor temperatures drop, the air holds less moisture, which can lead to dry indoor conditions. Maintaining humidity within this ideal range can prevent problems such as dry skin, respiratory discomfort, and damage to wooden furniture or flooring. Furthermore, keeping humidity levels too low can promote the proliferation of airborne viruses and bacteria, potentially affecting health.

Conversely, while higher humidity may seem comfortable, levels above this range can lead to condensation on windows, potential mold growth, and discomfort due to excess moisture in the air. Thus, the 20% to 40% range is considered optimal for maintaining indoor air quality and comfort during the cold months.