One solution to this problem is installing insect screens on your indoor and outdoor vents.
Floor vents and spiders.
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If there are particular areas that you have noticed spiders hanging out make sure that you spray them as well.
Replace or fix torn window screens and caulk up gaps around.
Pay attention to these spaces when planning your defense original source.
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Some vents are vertical and it is difficult place a trap inside for these types what i sometimes do is place wide strips of clear packing tape over the vent leaving thin slits 1 4 to 1 2 inch wide so that the air can still come through but when the insect tries to crawl out to freedom he will get stuck and die.
If you re seeing small insects and spiders in your house there s a good chance that they crawled in through a duct opening.
Seal up your home to keep spiders from entering through cracks and crevices.
Spray the spider solution along all entryways to your home including doorways window sills around a fireplace baseboards and vents.
Many spiders prefer dark areas and will hide in cracks to retreat.
Take preventative measures outdoors to keep the spiders from coming in.
Put screens over air vents.
Spiders tend to prefer places like basements crawl spaces upper corners of rooms and attics as well as sub floor air vents.
Cover vents with fine mesh insect screens.