There are several types of lady beetles. You may be noticing the multicolored asian lady beetle.  They seek a place to overwinter and in some instances are considered a nuisance. Favorable sites include attics, basements, and living areas of homes. On warm sunny days during the winter adults may fly towards windows and be seen walking on walls and ceilings. 

Prevention is the best way to manage the problem of beetles entering buildings.

In late summer and early fall, caulk cracks and seal any entry points around windows and install screening over vents. For doors that lead outside, replace and/or repair door sweeps and screens. (This will keep out other insects and critters too). If the beetles do enter the home, simply vacuum them up and release them outdoors. 

Marian