Mold is a fungus that has a preference for warm temperatures, dark environments, organic food sources (most construction materials & occupant personal belongings suffice), stagnant air, and damp environments (relative humidity of 60% +). If you can remove or eliminate any one of these items you can help prevent visible mold growth from occurring. In most scenarios, many of these items exist, and reducing their presence is beyond the control of a property owner. The energy certified IW25-4 in-wall / on-wall dehumidifier allows property owners to set a specific relative humidity range for a space (up to 1,500 square feet) regardless of the occupant HVAC and lifestyle, thus being a great tool to remove moisture and keep indoor relative humidity below 60%.