We receive calls for bats in the house in the Twin Cities year round. Common calls are for bats in houses, attics, walls, chimneys, and buildings.
Considerations to keep in mind when you have bats living in your home or place of business. Seasons play a huge factor in this specialized trade in the Midwest. Bats roosting and residing in houses and buildings in the spring and fall seasons are/ should be dealt with differently than when they are living in attic and wall spaces in the summer and winter seasons in Minnesota.
Generally speaking, spring and fall are typically the best times of the year in Minnesota to exclude bats from a structure. This is due to the bats being in a state of Torpor during the winter, and pup rearing in the summer.
For an album of bats in home see here.