Bifen
I use Bifen at our NC home. It's actually a termicide for termites but will kill any critter around. Mix 1 to 2 oz with a gallon of water and spray the perimeter of your house outside about a foot or two wide. Wouldn't hurt to do inside around the edge of the garage also. I have never used it inside the house. I have also heard that new construction homes have more spiders for the first year due to all the costruction disturbing the natural habitat for them.
I would bet it will settle down over time. Good luck.
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