https://youtu.be/a0EIPimtEdk
The box elder bug is a North American species of true bug. The adults are about 12.5 mm, dark brown with red wing. They hibernate in buildings and homes in the winter and in the warmer seasons live in elder, maple and ash trees. Like many overwintering pests, the most startling sign is the bugs when they invade in astounding numbers. They usually appear on sunny sides of buildings in the fall. They emerge when heat sources within the building are high and this can sometimes be when the furnaces get cranked up in this cold weather. Their droppings are unsightly and leave stains on furniture and linens. Some examples of important exclusion activities include, repairing damaged windows and door screens, installing door sweeps on exterior doors, installing or repairing screens in roof and soffit vents, sealing holes or gaps around places where cables, wires or plumbing enters the building and plugging gaps at doors, windowsills, roof joints, and fascia boards.
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http://www.delta-optimist.com/opinion/blogs/blog-what-are-box-elder-bugs-1.10732477