What can prolonged exposure to moisture lead to in a home?

Prolonged exposure to moisture in a home can lead to decreased air quality primarily due to the growth of mold and mildew. These organisms thrive in damp environments and can release spores into the air, which may be inhaled by the occupants, causing potential health issues such as respiratory problems, allergies, and other health complications. Additionally, excess moisture can contribute to increased humidity levels, which further deteriorates indoor air quality and can lead to discomfort for the occupants.

In contrast, improved insulation, increased energy efficiency, and better structural integrity are generally associated with dry, well-maintained environments. Moisture exposure can actually compromise insulation materials, reduce energy efficiency by causing additional energy load on heating and cooling systems, and weaken structural elements such as wood framing, leading to a decline in integrity. Thus, the focus on the negative implications of moisture exposure makes decreased air quality the most fitting answer in this scenario.