99% of these insects are smaller than a flaxseed & bigger than window screen. Westwold, BC first year ever seen and first time in house! Inside only on all window sills. Three year old windows. These insects fly. Not in furniture. Not on occupants or pets. They fly. No bites. Maybe coming in window sill drain holes. All vacuumed up and taken out outside only to have more appearing minutes later. Two weeks now and seem to be less and less.
This is a beetle in the family Dermestidae (carpet/larder/hide/skin beetles and relatives). You should check all your food storage areas as well as any organic fabrics (wool, silk, those trimmed with fur or feathers, etc.) in long-term storage and any wool rugs for signs of insect infestation. See http://tinyurl.com/zl9w25c elsewhere on this site for some control recommendations. Ed Saugstad, retired entomologist; Sinks Grove, WV.