What level of humidity is considered too high for indoor environments during most of the year?

A humidity level of 60% is often recognized as too high for indoor environments during most of the year. When humidity levels exceed this threshold, several issues can arise, including discomfort for occupants, potential growth of mold and mildew, and increased chances of dust mites and other allergens proliferating. High indoor humidity can also lead to damage to building materials and furnishings, as prolonged exposure to moisture can cause wood to warp and paint to peel.

Maintaining indoor humidity levels around 30-50% is generally recommended for optimal comfort and health. This range helps prevent the aforementioned problems while still allowing for adequate moisture in the air to support respiratory health. Therefore, identifying 60% as the tipping point for humidity highlights its importance in maintaining a healthy indoor environment.