Well for what your asking? Air tight your entire house? If that isnt possible...
Maybe send your newborn baby to the Grandparents for the weekend, and use some surface spray in some places you'd expect spiders to come through your house. Doorways, windows, drains etc. Might be better off searching for a repellant or remidies on Google then asking a group of ameteur astronomers.
Besides, spiders are your friend. They eat the annoying flying insects that spread germs, like flys. If its the walking spiders your worried about like the funnel web and other poisonous ones, surface spray on the ground at doorways will hold them at bay.
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