Jordan, welcome.
Two houses I've lived in out here in the west, one in Idaho, the other in Jackson Hole, Wyoming, had critters that "went thump in the night" and scratched, etc. as you are describing. In both cases it turned out we had pack rats, also known as woodrats, living with us. The bushy-tailed wood rats were particularly cute, endearing, almost charming little creatures. I imagine one of the several species of woodrats live where you do.
Friends of mine here in Colorado have successfully trapped out their woodrats using standard Victor rat traps.
A couple of observations of mine are that bats are not something to be feared. They are, in most cases, extremely beneficial as neighbors. Bill D speaks with accuracy to their winter migrating and to their winter torpor.
The other observation is that I'd plug up the bat access holes myself and build some bat houses so they could live outside, rather than pay someone $2500.
Please let us know what you decide and what how you handle the issue.