What is the recommended range of relative humidity in a house to maintain comfort and structural integrity?

The recommended range of relative humidity in a house to maintain both occupant comfort and the structural integrity of the building is between 30% and 50%. This range is ideal for several reasons.

From a comfort standpoint, this level of humidity is conducive to a pleasant living environment, helping to prevent issues such as dry skin, respiratory problems, and irritation of the eyes. When humidity levels are too low, it can lead to discomfort and potential health issues; conversely, excessively high humidity may cause excessive dampness, leading to mold growth and other moisture-related problems.

Structurally, maintaining humidity within this range helps prevent problems such as wood warping, peeling paint, and other deterioration that can occur when humidity levels are either too low or too high. High humidity can contribute to condensation, which, if it persists, can damage insulation, wall framing, and other structural components.

Thus, keeping indoor relative humidity between 30% and 50% strikes a balance that supports both comfort and the longevity of the building.