Dehumidifiers heat to a surface temperature of around 100-120deg F. The heat creates a natural convection that slowly circulates warm, dry air throughout an enclosure. To plug this DEHUMIDIFIER inside your safe, we recommended the ELECTRICAL OUTLET KIT.Specifications and Features: Maintains ideal temperature within safe to provide desired storage conditions Absorbs moisture within safe to prevent rusting of metal valuables Accommodates safes of most sizes