Which method is effective at controlling humidity in a building?

Adequate ventilation is an effective method for controlling humidity within a building because it facilitates the exchange of indoor and outdoor air, allowing excess moisture to escape. Proper ventilation systems help to regulate the humidity levels by introducing drier, outdoor air into the interior space, which can replace the moisture-laden air that accumulates due to activities like cooking, bathing, and even breathing.

In spaces with high humidity, such as bathrooms and kitchens, ventilation systems—like exhaust fans or whole-building ventilation strategies—play a crucial role in reducing humidity levels and preventing issues such as mold growth, structural damage, and discomfort for the occupants. Additionally, proper ventilation contributes to better indoor air quality by dissipating pollutants and odors.

While increasing insulation can improve the energy efficiency of a building, it does not directly affect moisture control; in certain scenarios, it might even trap humidity if not paired with adequate ventilation. Decreasing airflow would further exacerbate humidity issues, as it reduces the ability to expel moist air. Similarly, simply using more building materials does not address the need for moisture management and can lead to inefficiencies and potential condensation problems.