A colony of bats in the attic is common across the country, and the rules for removing them are strict. Here's how legal, effective bat removal works.
Why you can't trap or poison bats
Bats are protected under state and, for some species, federal law. They also eat thousands of insects a night. Exclusion — letting them leave and preventing return — is the only approach.
How exclusion works
One-way valves are installed at the main entries; every other gap larger than 3/8 inch is sealed. Bats leave at dusk to feed and can't get back in. After several nights the valves are removed and the openings sealed.
Timing
Exclusion is paused during the maternity season (roughly May–August in most states) so flightless pups aren't trapped. In Wisconsin, Vermont and Indiana the windows are set by the state wildlife agency.
Guano cleanup
Bat droppings can carry histoplasmosis. Removal is done with respirators and HEPA equipment, followed by sanitizing and insulation replacement where needed.
A bat in the living space
Isolate the room and call. If someone was asleep in the room, a doctor should assess rabies exposure.
Bat exclusion with warranty: (877) 948-7968.