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Wasps or hornets in house

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The fat blobby adorable ones that most people think of are these guys
600px-Bumblebee_heuchera.jpg

even if other species do get lumped in as well.
 
They have some crack or hole they are getting in at, and the size of the nest could be huge. I was running some cable through an attic with blown in insulation in a house, and found a nest about a foot wide and two feet high.

I would find the spot they are coming in, then come back at dawn in the morning with a couple cans of 30 foot wasp and hornet spray and hit the opening from a safe location, ie not under it, and no obstructions blocking a rapid exit.

You could also put up a wasp trap, but that is more control than eradicate.

Once you are sure all of them are dead, and I would repeat the process a couple different days, the entry point needs to be closed up, then "carefully" look for the inside entry point to your house.

Wasp/hornet spray has a tiny amount of poison in a mix of ether. Ether knocks them down, they can't fly, but may still crawl around, but you have to actually hit them with the spray, or its splash.
 
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