Which type of structure is likely to have higher mold growth due to better sealing?

The choice indicating that new homes are likely to have higher mold growth due to better sealing is accurate because modern construction practices often prioritize energy efficiency. New homes are typically built with improved insulation and more effective sealing techniques, which can inadvertently create an environment conducive to mold growth if not managed properly.

With better sealing, there's often less airflow and ventilation. If moisture is introduced, whether from humidity, leaks, or condensation, it can become trapped within the walls or other components of the house. Since newer homes tend to be more airtight, any existing moisture or humidity can lead to a higher likelihood of mold development, especially in areas that may not receive adequate airflow.

In contrast, older homes often have gaps and less efficient sealing, which may allow for more natural airflow and ventilation, potentially reducing moisture accumulation. Commercial buildings, while they also can have good sealing, usually include designs focused on ventilation for occupancy comfort. Rural houses vary widely in construction and conditions, making it difficult to generalize their mold growth risk based solely on their location.