What is the recommended indoor relative humidity level for residential environments during summer months?

The recommended indoor relative humidity level for residential environments during the summer months is around 50%. This level of humidity is ideal for comfort and health, as it helps to prevent the growth of mold and mildew that can thrive in more humid conditions. Maintaining a relative humidity at this level also contributes to overall indoor air quality, making it a more pleasant living environment.

When humidity levels rise above this range, especially approaching 60%, it can lead to discomfort and promote the proliferation of allergens. Conversely, very low humidity levels, such as those around 30%, can lead to dry skin, respiratory issues, and increased susceptibility to colds or allergies. Thus, keeping the humidity at about 50% strikes a balance between comfort and health.