What is a key indicator of potential mold growth in a property?

Visible water stains on walls are a key indicator of potential mold growth in a property because they signal the presence of moisture, which is a critical factor for mold development. Mold thrives in environments with high humidity or where water intrusion has occurred, so stained areas often indicate underlying water leaks or recent flooding incidents. These stains serve as a visible cue to property owners and restoration professionals that moisture control measures may be necessary to prevent mold proliferation.

The other options lack a direct connection to mold risks. Consistent air filtration contributes to improving indoor air quality and can help reduce contaminants, but it does not specifically indicate moisture presence. Daily temperature changes can affect humidity levels indirectly but do not directly correlate with mold risk. Newly installed furniture may introduce new materials into the environment, but, on its own, does not provide information about moisture conditions that favor mold growth.