Spiders usually enter the home in these ways: through open, poorly screened windows and doors and through cracks and gaps around door and window frames. Most of the time, spiders come inside the home looking for prey. Some spiders like moisture and are found in basements, crawl spaces and other damp parts of homes. Others like dry, warm areas such as subfloor air vents, upper corners of rooms and attics. Commonly they like to hide in dark places. Contact your pest management professional if you find spiders in your home so they can conduct an inspection and a create a comprehensive control plan.