Snow Melt Sensors work to sense both moisture and low temperature.  When enough moisture and a low enough temperature are present together, a system can be turned on to melt that snow as it falls.  This is more efficient than waiting until it builds up.  Snow melt systems that the SNOW OWL can turn on range from electric heat trace on rooftops and in gutters to concrete buried hydronic systems, also concrete buried MI Cable heating systems.  The SNOW OWL is an aerial sensor, so it needs to be mounted  in the air.