What is a common issue with powered attic ventilation fans?

Powered attic ventilation fans are designed to actively move air out of the attic space, helping to reduce heat buildup and moisture accumulation. However, a common issue associated with these fans is that they do not always function properly. This can be due to various factors such as improper installation, lack of maintenance, mechanical failures, or being the wrong size for the attic space. When the fan does not operate as intended, it fails to provide adequate ventilation, which can lead to problems like heat buildup during summer months and increased humidity levels in winter, potentially causing issues with roof and structural integrity.

On the other hand, powered fans often do run continuously or at least regularly during certain conditions, but this is not the primary concern compared to their performance. While they can certainly last over ten years with proper care, this lifespan can vary widely based on usage and maintenance, making this option less relevant to the common issues seen. Energy consumption varies based on design, but typically powered fans consume more energy than passive ventilation systems, which rely on natural air movement. Thus, the focus on their performance or functionality presents a more prevalent issue in practical applications.