The presence of feeding debris or frass is an indication of infestation. Examine window sills regularly as many pests fly or crawl towards light. Also check inside ceiling light fixtures. Pests may be found behind baseboards, under furniture, behind moldings, in cracks in floors, behind radiators, or in air ducts. Check around door jambs for cockroaches and spider webs.
Spiders often spin their webs across gaps around doors to capture insects trying to enter.
Look, too, for conditions that might lead to pest problems. Check for moisture problems, both indoors and out, which may lead to moisture related pests such as carpenter ants, termites, or mold. Watch for damaged screens, doors, and walls, which could allow pest entry. Note any sanitation problems. Be aware that fresh flowers and other plant materials may be infested with insect pests.