As the temperatures start falling and the leaves start changing colors, you might start seeing more and more bats.
However, despite what many think, there isn't an increase in the bat population.
"A lot of bats show up in people's houses this time of the year because the baby bats that were born in May have had enough time to take flight so the colonies that are in the houses are extremely active right now," said Bill Christman of Christman's Wildlife Services.
Busy bats mean a busy business for Christman. He says they get swamped with phone calls as the weather turns cooler, because that's when bats are looking for somewhere warm to live.
"Bats are very temperature sensitive," Christman said.
Whether you have five bats or 500, Christman says the process to get them out is the same.
"We put tubes, little one-way doors that will allow the bats to come out at night to go out and feed, but it won't allow them to re-enter."
Still, Christman says they could enter somewhere else - holes as small as a quarter inch - and that's why he recommends homeowners get their houses sealed.
"It's a total seal-up - from the foundation level to the peak of the roof," he said. "A tightening of the house, if you will."
Time is of the essence. Christman says if you want to get the bats out of your house this year, it needs to be sealed before October 15th.
"Because then they go into hibernation, so work can still be done on the house as far as sealing it up, but they can't expect the bats to leave until next spring."
Christman says if you find a bat in your house, don't try to catch it. Instead, confine it to a room and then call an expert.
Also, do not kill it.
"They're protected by law," he said. "You don't want to kill a colony of bats or even a single bat because they are protected and they're very good for the environment."