Bats in the attic are a protected-species problem, so they cannot be exterminated. The correct, legal fix is one-way exclusion done at the right time of year.
Bats are protected and play a real role in insect control, so the work is exclusion, never killing. One-way devices let bats leave to feed but block their return, clearing the roost over several nights without harm, after which the entries are sealed with branded exclusion products.
Timing is the catch. During maternity season, exclusion has to wait, because sealing out adults would trap flightless pups inside. Accumulated guano is also a health concern and soaks into insulation, so cleanup and attic remediation are part of doing the job properly rather than only closing the gap.
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Not with a net. The legal, humane method is one-way exclusion over several nights, season permitting.
It can harbor a fungus linked to respiratory illness and soaks into insulation, so cleanup is part of the work.
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