What triggers these beetles to begin invading homes (looking for a place to overwinter) is usually the passing of a cold front that produces heavy rain followed by clearing skies and a frost.  Generally, this weather pattern is followed by a warming trend, which triggers these beetles to seek shelter. 

 Weatherproofing your home by sealing cracks around windows and installing tight fitting door sweeps.  A good technique for checking for cracks, is to go outside at night with a flashlight.  Shine the flashlight along the windows and doors, while someone inside observes for light penetration.  If light can come through, so can the beetles.  If heavy infestations get into the home vacuuming and then sealing and disposing the bag is an effective means of removing the beetles.  Exterior insecticide application to the house in from middle of October to early November may also help keep the Multicolored Asian Lady Beetle from infesting your home.