Carpenter ants are one of the largest pest ants in the United States. Carpenter ants are nocturnal, so you may need to inspect after dark with a flashlight. They can be found inside wood, which means they may be attracted to your home’s frame, deck material, etc. The problem is that they will bore holes in wood, damaging its structural integrity.
While rare, a carpenter ant will bite as a defense if their nest is disturbed or when otherwise threatened. Their bites sting, but carpenter ants aren’t known to spread infections or diseases.