What is a common consequence of ineffective sealing in buildings?

Ineffective sealing in buildings often permits air leaks, which can lead to various issues, primarily condensation and indoor discomfort. When seals around windows, doors, and other openings are inadequate, outside air can infiltrate the building, causing temperature differences that contribute to condensation on cold surfaces. This moisture can lead to problems like mold growth, structural damage, and can create an uncomfortable indoor environment for occupants due to fluctuating temperatures and humidity levels. Therefore, the correct answer emphasizes the relationship between poor sealing and the negative implications it can have on indoor conditions.

Options suggesting increased energy efficiency or moisture reduction are inaccurate because poor sealing typically results in higher energy costs and increases the risk of moisture problems. Additionally, the idea that there is no effect on air quality is also misleading, as ineffective sealing can allow pollutants and allergens from outside to enter, compromising the indoor air quality experienced by occupants.