There are thousands of varieties of spiders in North America and many of those are household pests. All spiders feed mainly on bugs and can be found wherever their food is. Some prefer damp areas of the home and others prefer warm, dry spaces but all of them hide in dark areas. Most spiders prove harmless to humans but some do contain a harmful bite. If you suspect an infestation it is best to call professional pest control to rid the home before the infestation gets out of control.