I found ~30 baby spiders scattered across my bathroom ceiling/venturing into the adjacent room after coming home from a weekend trip. I vacuumed those up and sprayed the 2 rooms with pesticide. I’m worried about what to do next because I haven’t found the nest anywhere and online pictures seem to imply there should be many more spiders.
My best guess is that they came from a vent on the ceiling, because they’ve all been on the ceiling so far and its been many months since I’ve used the HVAC. I think I might just wipe all of the vent covers down with the pesticide… How worried should I be? Is there anything else I could do to keep them from spreading into my home? My partner is against harsh chemicals so I’m trying to avoid dousing the entire home.


You’re done.
Nothing you can spray into a vent is anything you want to spray in a vent.
Not that it’s necessary or useful. Most spiders disperse fairly quickly anyway. There are species that share space, but there wouldn’t be thirty of them moving across your ceiling, they’d be holed up wherever they live and you wouldn’t see them.
For real, even the pesticide was a waste of time and money.
Don’t be wiping down your vents with stuff like that. That’s a horrible idea.