The biggest out there right now are the orb weavers, the wolf spiders, and the Tegenaria--hobos and related spiders.
Since it's cooled off outside, the little fuzzies just want a place to get warm. Seems reasonable, right? No way! Not unless they're paying rent. To keep them from calling your main floor or basement home, we recommend a perimeter treatment to keep their friends from coming inside, and an inside treatment to get rid of the squatters that are already indoors.
Which brings up another point. Spiders don't groom themselves the way many insects do. They don't clean their feet and antennae with their mouthparts. Heck-they don't even HAVE antennae! So the chemical takes longer to affect spiders. That's why you're better off with quarterly control. Call us to get a free quote!