Squirrels inside your house can be more than a nuisance. Here's some reasons why:

1. To gain access, squirrels may chew holes in your exterior walls, letting in damaging moisture or other pests
2. They may chew through electrical wires and start a fire -- and the damage may not be covered by your homeowner's or renter's insurance
3. Squirrels may shred attic, wall, or pipe insulation
4. They may damage interior wood in your attic or walls
5. Squirrels may take over your chimney, preventing your use of it
6. They leave unsanitary conditions and nasty smells in your house from their feces and urine
7. Squirrels may carry disease or insects (ticks, mites, chiggers) that could harm your health