re: Anybody have any experience evicting a colony of BATS from a house?

I would read this article before you go down the route of DIY removal tactics.

How to remove bats from your house

Couple quick notes:
- removing or excluding them now, during breeding and pupping season, may result in the adults leaving but the young trapped inside and waiting to die.

- if you don't seal up all the holes (they can gain access through something as small as 1" × 3/8"), then they will just come back. So make sure everything is sealed.

- adding a bat box nearby may help discourage them from trying to gain re-entry into the house. Plus bats are cool and eat lots of mosquitos.

- depending on the species, they may have a federal protection through the Endangered Species Act. In that case, any sort of intentional harassment or killing is very much illegal. So if you are building a fire specifically to kill the bats, that's a no go. However, if you just happen to want to build a really smoky fire in June and it happens to push the bats out, you're good. Sounds like you have a bunch of green wood you just HAVE to burn, right?